CN116127819B - Method for generating cohesive force unit, computer device and storage medium - Google Patents
Method for generating cohesive force unit, computer device and storage medium Download PDFInfo
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Abstract
The application discloses a method for generating cohesive force units, computer equipment and a storage medium, and belongs to the technical field of computers. The method comprises the following steps: obtaining a first finite element model of a target structural member, generating a plurality of surface units of each target unit in m target units included in the first finite element model, determining n repeated surface unit pairs from the surface units, and generating n cohesive force units according to the n repeated surface unit pairs. The application can generate n cohesive force units in batches.
Description
Technical Field
The present application relates to the field of computer technology, and in particular, to a method for generating a cohesive force unit, a computer device, and a storage medium.
Background
The inevitable defects in the material cause structural fracture in engineering. Currently, cohesive force models based on elastoplastic fracture mechanics are widely used to calculate material interface damage and fracture processes. The cohesive force model avoids the crack tip stress singularity in the line elastic fracture mechanics, calculates the stress and the fracture energy in the cracking process, and makes the crack tip stress singularity and the fracture energy widely attach and apply to the fields of crack propagation, composite material layering and debonding, device gluing and the like.
The cohesion model is realized by inserting a zero thickness cohesion unit into the finite element model of the structural member. However, there is a need for a method of mass generating cohesive units based on a finite element model of a structural member, since fewer effective methods are available for mass inserting cohesive units in the finite element model of the structural member.
Disclosure of Invention
The application provides a method for generating cohesive force units, a computer device and a storage medium, wherein a plurality of cohesive force units can be generated in batches. The technical scheme is as follows:
in a first aspect, a method of generating cohesive units is provided. In the method, a first finite element model is acquired, wherein the first finite element model is a finite element model of a target structural member, the first finite element model comprises m target units, and m is an integer greater than or equal to 2. And then generating a plurality of surface units of each of the m target units, determining n repeated surface unit pairs from the plurality of surface units of each of the m target units, wherein each repeated surface unit pair in the n repeated surface unit pairs comprises two surface units with repeated positions, and n is an integer greater than or equal to 2. Finally, n cohesive force units are generated according to n repeated surface unit pairs.
Any one of the m target units has a unit identification and node information. The node information of a target unit includes a node identification of each of all nodes constituting the target unit. One face unit has a unit identifier and node information, and the node information of one face unit includes a node identifier of each of all nodes constituting the face unit.
In the application, after the first finite element model of the target structural member is obtained, a plurality of surface units of each of m target units included in the first finite element model can be generated, n repeated surface unit pairs are determined from the surface units, and n cohesive force units are generated according to the n repeated surface unit pairs, so that n cohesive force units can be generated in batches.
Alternatively, the operation of generating the plurality of face units for each of the m target units may be: obtaining a unit identifier of each target unit in m target units; a plurality of face units of any one of the m target units are generated using a face unit generation function based on the unit identity of that target unit.
According to the unit identification of any target unit, the application can use the surface unit generation function to simply and quickly generate a plurality of surface units of the target unit.
Optionally, a second finite element model may also be generated, the second finite element model comprising a plurality of face units for each of the m target units. In this case, the operation of determining n repeated pairs of face units from among the plurality of face units of each of the m target units may be: displaying the second finite element model; n repeating surface unit pairs are found from all surface units in the displayed second finite element model using a repeating unit finding function.
In the application, the repeated unit searching function can simply and quickly search n repeated surface unit pairs from all surface units in the displayed second finite element model.
Optionally, before generating the n cohesive units according to the n repeated pairs of surface units, a first set may be further created, where the first set includes m first subsets corresponding to the m target units one to one, and each first subset of the m first subsets includes a unit identifier of the corresponding target unit and a unit identifier of each surface unit of the plurality of surface units of the corresponding target unit. A second set is created, the second set comprising n second subsets in one-to-one correspondence with n repeating pairs of surface units, each of the n second subsets comprising a unit identity for each of two surface units comprised by the corresponding repeating pair of surface units.
In this case, the operation of generating n cohesive units from n repeating pairs of face units may be: generating n cohesive force units according to the first set and the second set. In the application, n cohesive force units can be simply and quickly generated directly according to the first set and the second set.
Alternatively, the operation of generating n cohesive units from the first set and the second set may be: separating the face unit of each of the m target units from the face units of other target units according to the m first subsets in the first set to update node information of the separated face units; acquiring n groups of node information corresponding to n second subsets in the second set one by one, wherein each group of node information in the n groups of node information comprises node information of face units identified by each unit identifier in two unit identifiers included in the corresponding second subset; generating n cohesive force units according to the n groups of node information.
In the application, the surface unit of each target unit in m target units is separated from the surface units of other target units, and then the cohesive force unit can be accurately generated according to the node information of two surface units in each repeated surface unit pair in n repeated surface unit pairs.
Optionally, the operation of obtaining n sets of node information corresponding to n second subsets in the second set one-to-one may be: for any one of the n second subsets, acquiring node information of the face unit identified by each of the two unit identifications included in the second subset to obtain two node information; determining the corresponding relation between node identifiers in the two node information; and sequentially adding the node identifiers in the two node information into a group of node information corresponding to a second subset according to the corresponding relation between the node identifiers in the two node information.
The node identifiers in one node information of the two node information are in one-to-one correspondence with the node identifiers in the other node information. The correspondence between the node identifiers in the two node information is used to indicate the node identifier corresponding to one node identifier in one node information in the other node information. The two nodes identified by the corresponding two node identifications are the two nodes closest to each other in the nodes identified by all node identifications in the two node information, and the positions of the two nodes identified by the corresponding two node identifications are the same.
Optionally, according to the correspondence between node identifiers in the two node information, the operation of sequentially adding the node identifiers in the two node information to a set of node information corresponding to a second subset may be: all node identifiers in one node information in the two node information are added to the group of node information in sequence; ordering all node identifiers in the other node information in the two node information according to the sequence of all node identifiers in the one node information and the corresponding relation between the node identifiers in the two node information; and adding all node identifiers in the sorted other node information into the group of node information in sequence.
For example, when n cohesive units are generated according to n sets of node information, for any one set of node information in the n sets of node information, a plurality of nodes identified by a first half node identification in the set of node information may be sequentially connected, and a plurality of nodes identified by a second half node identification in the set of node information may be sequentially connected, and the plurality of nodes identified by the first half node identification and the plurality of nodes identified by the second half node identification in the set of node information may be one-to-one connected, so as to obtain one cohesive unit, and then the cohesive unit may be given a unit identification.
Optionally, after generating n cohesive force units according to the n groups of node information, a third finite element model may be generated, where the third finite element model includes n cohesive force units; bulk properties are set for the first finite element model and cohesive properties are set for the third finite element model.
Wherein the bulk properties of the first finite element model are related properties of the target structure, such as may include density, modulus of elasticity, poisson's ratio, etc. The cohesive force properties of the third finite element model are related properties of cohesive force units, which may include, for example, tensile stiffness, shear stiffness, tensile strength, shear strength, tensile energy to break, shear energy to break, and the like. After the body attribute is set for the first finite element model and the cohesive force attribute is set for the third finite element model, the cracking phenomenon simulation can be performed according to the first finite element model and the third finite element model.
In a second aspect, there is provided an apparatus for generating cohesive force units having a function of realizing the method behavior of generating cohesive force units in the first aspect described above. The means for generating cohesive force units comprises at least one module for implementing the method for generating cohesive force units provided in the first aspect above.
In a third aspect, there is provided an apparatus for generating cohesive force units, the structure of the apparatus for generating cohesive force units including a processor and a memory, the memory being configured to store a program for supporting the apparatus for generating cohesive force units to execute the method for generating cohesive force units provided in the first aspect, and to store data related to the method for generating cohesive force units according to the first aspect. The processor is configured to execute a program stored in the memory. The means for generating cohesive force units may further comprise a communication bus for establishing a connection between the processor and the memory.
In a fourth aspect, a computer readable storage medium is provided, in which instructions are stored which, when run on a computer, cause the computer to perform the method of generating cohesive force units according to the first aspect described above.
In a fifth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of generating cohesive force units as described in the first aspect above.
The technical effects obtained by the second, third, fourth and fifth aspects are similar to the technical effects obtained by the corresponding technical means in the first aspect, and are not described in detail herein.
Drawings
FIG. 1 is a schematic diagram of a computer device according to an embodiment of the present application;
FIG. 2 is a flow chart of a method of generating cohesive force units provided by an embodiment of the present application;
FIG. 3 is a schematic view of a finite element model of a target structure according to an embodiment of the present application;
FIG. 4 is a schematic illustration of a finite element model of a first target structure and a finite element model of a cohesive unit provided in an embodiment of the present application;
FIG. 5 is a schematic illustration of a finite element model of a second target structure and a finite element model of a cohesive unit provided in an embodiment of the present application;
FIG. 6 is a schematic illustration of a finite element model of a third target structure and a finite element model of a cohesive unit provided in an embodiment of the present application;
FIG. 7 is a schematic illustration of a finite element model of a fourth target structure and a finite element model of a cohesive unit provided by an embodiment of the present application;
FIG. 8 is a schematic diagram of a finite element model of glue cracking provided by an embodiment of the application;
fig. 9 is a schematic structural view of an apparatus for generating cohesive force units according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that references to "a plurality" in this disclosure refer to two or more. In the description of the present application, "/" means or, unless otherwise indicated, for example, A/B may represent A or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and function. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.
The statements of "one embodiment" or "some embodiments" and the like, described in this disclosure, mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present disclosure. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the present application are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. Furthermore, the terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically noted.
The application scenario according to the embodiment of the present application is described below.
The inevitable defects in the material cause structural fracture in engineering. For example, a large amount of structural adhesive exists in the mobile phone, parts are adhered by the adhesive, and the adhesive cracking is a common failure mode in mechanical or environmental reliability research, and can be divided into adhesive interface debonding, adhesive body cracking and a combination of the two. Along with the development of the diversity of material structure types, traditional fracture mechanics can not meet research requirements such as toughness fracture and material interface fracture. Whereas cohesion models (cohesive zone model, CZM) based on elastoplastic fracture mechanics have been widely used to calculate material interface damage and fracture processes.
The cohesive force model avoids the crack tip stress singularity in the line elastic fracture mechanics, calculates the stress and the fracture energy in the cracking process, and makes the crack tip stress singularity and the fracture energy widely attach and apply to the fields of crack propagation, composite material layering and debonding, device gluing and the like. The cohesive force model is realized by inserting a zero-thickness cohesive force unit (hereinafter simply referred to as cohesive force unit) into a finite element model of the structural member. The cohesive unit is capable of withstanding tensile and shear strains, but does not create any stress, and the combination of supporting the traction-separation failure criteria perpendicular to the upper and lower surfaces better simulates breaking and failure of the material.
However, there is currently a need for less efficient methods available for mass insertion of cohesive units in a finite element model of a structure. Therefore, the embodiment of the application provides a method for generating cohesive force units, which can generate a plurality of surface units of each entity unit in a plurality of entity units included in a finite element model of a structural member, then determine a plurality of repeated surface unit pairs therefrom, and finally generate a plurality of cohesive force units according to the repeated surface unit pairs, so that the cohesive force units can be generated in batches.
Computer devices according to embodiments of the present application are described below.
Fig. 1 is a schematic structural diagram of a computer device according to an embodiment of the present application. Referring to fig. 1, the computer device includes at least one processor 101, a communication bus 102, a memory 103, and at least one communication interface 104.
The processor 101 may be a microprocessor (including a central processing unit (central processing unit, CPU), etc.), an application-specific integrated circuit (ASIC), or may be one or more integrated circuits for controlling the execution of programs in accordance with aspects of the present application.
Communication bus 102 may include a path for transferring information between the above-described components.
The memory 103 may be, but is not limited to, a read-Only memory (ROM), a random-access memory (random access memory, RAM), an electrically erasable programmable read-Only memory (EEPROM), an optical disk (including a compact disk (compact disc read-Only memory, CD-ROM), a compact disk, a laser disk, a digital versatile disk, a blu-ray disk, etc.), a magnetic disk storage medium, or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and capable of being accessed by a computer. The memory 103 may be stand-alone and may be coupled to the processor 101 via the communication bus 102. Memory 103 may also be integrated with processor 101.
The communication interface 104 uses any transceiver-like device for communicating with other devices or communication networks, such as ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area network, WLAN), etc.
In a particular implementation, as one embodiment, processor 101 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 1.
In a specific implementation, the computer device may include multiple processors, such as processor 101 and processor 105 shown in FIG. 1, as one embodiment. Each of these processors may be a single-core processor or a multi-core processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
In a specific implementation, the computer device may also include an output device 106 and an input device 107, as one embodiment. The output device 106 communicates with the processor 101 and may display information in a variety of ways. For example, the output device 106 may be a liquid crystal display (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a Cathode Ray Tube (CRT) display device, or a projector (projector), or the like. The input device 107 communicates with the processor 101 and may receive user input in a variety of ways. For example, the input device 107 may be a mouse, a keyboard, a touch screen device, a sensing device, or the like.
The computer device may be a general purpose computer device or a special purpose computer device. In a specific implementation, the computer device may be a desktop, a portable computer, a network server, a palm computer, a mobile phone, a tablet computer, a wireless terminal device, a communication device, or an embedded device, and the embodiment of the present application is not limited to the type of the computer device.
Wherein the memory 103 is used for storing the program code 110 for executing the inventive arrangements, and the processor 101 is used for executing the program code 110 stored in the memory 103. The computer device may implement the method of generating cohesive force elements provided by the embodiment of fig. 2 below by the processor 101 and the program code 110 in the memory 103.
Fig. 2 is a flowchart of a method for generating cohesive force units according to an embodiment of the present application, which is applied to the computer device described in the embodiment of fig. 1. Referring to fig. 2, the method includes the steps of:
step 201: a computer device obtains a first finite element model.
The first finite element model is a finite element model of the target structure. The target structural member is a structural member which is required to simulate cracking or chip production phenomena. The target structural member may be a composite material or a single material, which is not limited in this embodiment of the present application. For example, the target structure may be glue, such as AA glue, which is often used in cell phones.
The first finite element model is a simulation model of the target structure, the first finite element model having geometric features and a unit form of the target structure. The first finite element model is a mesh model, and the first finite element model comprises m target units, wherein the m target units are entity units, and m is an integer greater than or equal to 2. Each of the m target units is a polyhedral unit, and the number of faces of each of the m target units is the same. Each of the m target units is composed of a plurality of nodes, and the number of the nodes of each of the m target units is the same.
Any one of the m target units has a unit identification (including, but not limited to, a unit number) and node information. The node information for a target unit includes a node identification (including, but not limited to, a node number) for each of all nodes comprising the target unit. For example, if the target unit is a hexahedral unit, the target unit may include 8 nodes; if the target unit is a pentahedron unit, the target unit may include 5 nodes; if the target cell is a tetrahedral cell, the target cell may include 4 nodes.
Step 202: the computer device generates a plurality of face units for each of m target units included in the first finite element model.
The target unit is a polyhedral unit, and thus the target unit may have a corresponding face unit composed of a plurality of nodes. For example, if the target unit is a hexahedral unit, the target unit has 6 surface units, and any one surface unit may include 4 nodes; if the target unit is a pentahedron unit, the target unit has 5 face units, and any one face unit can comprise 3 or 4 nodes; if the target cell is a tetrahedral cell, the target cell has 4 face cells, any one of which may include 3 nodes. One face unit has a unit identifier and node information, and the node information of one face unit includes a node identifier of each of all nodes constituting the face unit.
Alternatively, the operation of step 202 may be: the method comprises the steps that computer equipment obtains a unit identifier of each target unit in m target units; the multiple surface units of each target unit are generated according to the unit identifier of each target unit in the m target units, and specifically, the multiple surface units of the target unit can be generated by using the surface unit generating function according to the unit identifier of any target unit in the m target units.
For example, when the computer device obtains the unit identifier of each of the m target units, the unit identifier of each of the m target units included in the first finite element model may be obtained by traversing the first finite element model, that is, obtaining m unit identifiers, and a third set may be created, and the m unit identifiers may be stored in the third set.
For example, when the computer device generates a plurality of surface units of each target unit according to the unit identifier of each target unit in the m target units, each unit identifier in the m unit identifiers in the third set may be traversed, and for one currently traversed unit identifier, the surface unit generating function may be used to quickly generate a plurality of surface units of the target unit identified by the unit identifier according to the unit identifier. Wherein the face unit generation function is a function for generating face units of the entity units. For example, the face unit generation function may be a find face function.
In this case, after the computer device traverses to one unit identifier in the third set and generates a plurality of surface units according to the unit identifier, a fourth set may be created, the unit identifier of each surface unit in the plurality of surface units newly generated this time is stored in the fourth set, then the first subset is created, and the unit identifier and all unit identifiers in the fourth set are stored in the first subset. In this case, after all the unit identifiers in the third set are traversed, m first subsets are obtained, where the m first subsets are in one-to-one correspondence with m target units, and each first subset in the m first subsets includes the unit identifier of the corresponding target unit and the unit identifier of each of the plurality of face units of the corresponding target unit. Thereafter, the computer device may create a first set comprising m first subsets.
In addition, the computer device may also generate a second finite element model. In this case, each traversal to a unit identifier in the third set, after generating a plurality of surface units according to the unit identifier, each surface unit in the plurality of surface units newly generated at this time may be added to the second finite element model. In this case, after traversing all of the cell identities in the third set, the second finite element model would include a plurality of face cells for each of the m target cells.
Step 203: the computer device determines n repeating pairs of face units from a plurality of face units for each of the m target units, n being an integer greater than or equal to 2.
Each of the n repeating surface unit pairs includes two surface units that are positionally repeated.
Alternatively, the operation of step 203 may be: displaying the second finite element model; n repeating surface unit pairs are determined from all surface units in the displayed second finite element model, and in particular, the repeating surface unit pairs can be quickly found from all surface units in the displayed second finite element model using a repeating unit finding function.
The repeating unit search function is a function for searching for a repeating unit from among units included in the displayed finite element model. For example, the repeat unit lookup function may be a duplicate function.
In this case, each time the computer device determines a pair of repeating surface units, a second subset may be created, and the unit identity of each of the two surface units included in the newly determined pair of repeating surface units is stored to the second subset. After all the repeating surface unit pairs (i.e., n repeating surface unit pairs) are determined, n second subsets are obtained, where the n second subsets are in one-to-one correspondence with the n repeating surface unit pairs, and each second subset in the n second subsets includes a unit identifier of each of the two surface units included in the corresponding repeating surface unit pair. Thereafter, the computer device may create a second set comprising n second subsets.
Step 204: the computer device generates n cohesive units from the n repeating pairs of surface units.
For any one of the n repeating face unit pairs, one cohesive unit may be generated between two face units included in the repeating face unit pair, and thus, n cohesive units may be generated in batch.
Alternatively, the operations of step 204 may include two ways:
the first way is: for any one of the n repeating surface unit pairs, the computer device newly generates a junction at the location of each junction in all junctions of one surface unit of the repeating surface unit pair, assigns the newly generated all junctions to the other surface unit of the repeating surface unit pair, and constructs a cohesive unit through all junctions of both surface units of the repeating surface unit pair.
For example, when the computer device constructs a cohesive unit through all nodes of two surface units in the repeated surface unit pair, all nodes of each surface unit in the two surface units may be connected in sequence, and then the nodes in the same position in the two surface units are connected one by one, so as to obtain a cohesive unit, and then a unit identifier is given to the cohesive unit.
The second way is: the computer device generates n cohesive force units from the first set and the second set.
In this way, the computer device can simply and quickly generate n cohesive units directly from the first set and the second set.
Optionally, the operation of the computer device to generate n cohesive force units from the first set and the second set may be: separating the face unit of each of the m target units from the face units of other target units according to the m first subsets in the first set to update node information of the separated face units; acquiring n groups of node information corresponding to n second subsets in the second set one by one, wherein each group of node information in the n groups of node information comprises node information of face units identified by each unit identifier in two unit identifiers included in the corresponding second subset; generating n cohesive force units according to the n groups of node information.
In the embodiment of the application, the surface unit of each target unit in the m target units is separated from the surface units of other target units, and then the cohesive force unit can be accurately generated according to the node information of two surface units in each repeated surface unit pair in the n repeated surface unit pairs.
For example, when the computer device separates the surface unit of each target unit from the surface units of other target units according to m first subsets in the first set, the computer device may traverse m first subsets in the first set, and for one first subset currently traversed, the surface unit of the target unit corresponding to the first subset may be quickly separated from the surface units of other target units by using the unit separation function. The unit separation function is used to separate two repeated units, and may be, for example, a detach function. Separating one face unit from another face unit refers to: a node is newly generated at the position of each of all nodes of the one face unit, and all nodes newly generated are allocated to the other face unit, so that node information of the separated other face unit is updated.
When the computer equipment obtains n groups of node information corresponding to n second subsets in the second set one by one, for any one of the n second subsets, obtaining node information of a face unit identified by each of two unit identifications included in the second subset to obtain two node information; determining the corresponding relation between node identifiers in the two node information; and adding the node identifiers in the two node information into a group of node information corresponding to the second subset in sequence according to the corresponding relation between the node identifiers in the two node information.
The node identifiers in one node information of the two node information are in one-to-one correspondence with the node identifiers in the other node information. The correspondence between the node identifiers in the two node information is used to indicate the node identifier corresponding to one node identifier in one node information in the other node information. The two nodes identified by the corresponding two node identifications are the two nodes closest to each other in the nodes identified by all node identifications in the two node information, and the positions of the two nodes identified by the corresponding two node identifications are the same.
When the computer device sequentially adds the node identifiers in the two node information to a group of node information corresponding to the second subset according to the corresponding relation between the node identifiers in the two node information, all the node identifiers in one node information in the two node information can be sequentially added to a group of node information corresponding to the second subset, and then all the node identifiers in the other node information in the two node information are sequenced according to the sequence of all the node identifiers in the node information and the corresponding relation between the node identifiers in the two node information, and all the node identifiers in the sequenced other node information are sequentially added to the group of node information.
For example, when the computer device generates n cohesive units according to n sets of node information, for any one set of node information in the n sets of node information, the first half node identification in the set of node information may be sequentially connected to the plurality of nodes identified by the first half node identification in the set of node information, and the second half node identification in the set of node information may be sequentially connected to the plurality of nodes identified by the first half node identification and the second half node identification in the set of node information, so as to obtain one cohesive unit, and then the cohesive unit may be given a unit identification.
Further, after the computer device generates n cohesive units, a third finite element model (which may also be referred to as a cohesive model) may also be generated, the third finite element model including n cohesive units. Thereafter, bulk properties may be set for the first finite element model, and cohesive properties may be set for the third finite element model. Wherein the bulk properties of the first finite element model are related properties of the target structure, such as may include density, modulus of elasticity, poisson's ratio, etc. The cohesive force properties of the third finite element model are related properties of cohesive force units, which may include, for example, tensile stiffness, shear stiffness, tensile strength, shear strength, tensile energy to break, shear energy to break, and the like.
Further, the computer device may also define the operating conditions and generate other finite element models to complete the preprocessing.
The working conditions are used for indicating the connection relation between the target structural member and other components in the subsequent simulation process and indicating the operation required to be executed in the subsequent simulation process.
After the preprocessing is completed, a plurality of finite element models are obtained, including a first finite element model, a third finite element model, and finite element models of other related components. Wherein the third finite element model may be embedded in the first finite element model. Then, the computer equipment can perform simulation calculation according to the obtained finite element models so as to simulate the phenomena of cracking, chip production and the like of the target structural member.
In the embodiment of the application, after the first finite element model of the target structural member is obtained, a plurality of surface units of each of m target units included in the first finite element model can be generated, n repeated surface unit pairs are determined from the surface units, and n cohesive force units are generated according to the n repeated surface unit pairs, so that n cohesive force units can be generated in batches.
It should be noted that the method for generating cohesive force units provided in the embodiment of the present application may be run in finite element analysis software. The finite element analysis software may include Hypermesh software, abaqus software, etc., which is not limited in this embodiment of the present application.
According to the method for generating the cohesive force unit, the zero-thickness cohesive force unit can be inserted between any two units in the finite element model of the target structural member, and the phenomena of cracking, chip production and the like of the target structural member can be simulated by using the cohesive force unit subsequently.
One possible implementation of the method for generating a cohesive unit according to the embodiment of the present application is illustrated below by taking a unit identifier as a unit number and a node identifier as a node number as an example. The method may include the operations of:
the first step: a finite element model Component (hereinafter referred to simply as Comp) of the target structural member is created in finite element analysis software and named as glue.
For example, as shown in fig. 3, the created finite element model Comp value of the target structural member may be a three-layer hexahedral mesh model, where the finite element model Comp value includes m target units, and each of the m target units is a hexahedral unit.
And a second step of: inserting n cohesive units into the finite element model Comp glue may specifically include the following steps (1) to (7). The operations of the second step may be automatically performed in the finite element analysis software based on TCL/tk Script written in a tool command language (Tool Command Language, TCL), for example, although the operations of the second step may be automatically performed in the finite element analysis software based on Script written in other languages, which is not limited in this embodiment of the present application.
(1) Traversing the finite element model Comp glue to obtain the unit number of each target unit in the finite element model Comp glue, creating a set and named list_elements, and storing the obtained unit number of each target unit in all target units to the set list_elements.
In this case, the unit number of each of all the target units in the finite element model Comp value is included in the set list_elements.
For example, if the finite element analysis software is Hypermesh software, the set described in the embodiment of the present application may be a list (list). If the finite element analysis software is other software, the set described in the embodiments of the present application may be implemented in other forms.
(2) Each element number in the set list_elements is traversed to generate a plurality of face elements for each target element.
In this case, a finite element model Comp is created and named interface for storing all the face units generated. If traversing to the first unit number in the set list_elements, a finite element model Comp may be automatically created and named as a face for storing newly generated face units, then, according to the first unit number, a final face function may be used to generate a plurality of face units of the target unit identified by the first unit number, the newly generated face units are stored to the finite element model Comp face, then, a set is created and named as a list detach_face_face, the unit number of each face unit in the finite element model Comp face is stored to the set list detach_face_face, a subset is newly created and named as a list detach_face, and all the unit numbers in the first unit number and the set list detach_face are stored to the list_face_face, and then, the step is continued to the subset of face units. If the unit number is traversed to the unit number other than the first unit number in the set list_elements, a plurality of face units of the target unit identified by the unit number can be generated by using a find face function according to the currently traversed unit number, the newly generated plurality of face units are updated and stored to the finite element model complete, that is, the newly generated plurality of face units are used for replacing all face units stored in the finite element model complete, the newly generated plurality of face units are stored to the finite element model complete, then the unit number update of each face unit in the finite element model complete is stored to the set list_face_element, that is, the unit number of each face unit in the finite element model complete is used for replacing the unit number stored in the set list_face_element, a subset is newly created and named as the unit number of the face unit list_face_element, and then the unit number update of each face unit in the finite element model complete is stored to the set list_face_element, and the unit number of each face unit in the set list_face unit is traversed to the next list_element, and the unit number of each face unit in the set list_element is updated and the unit list_element_element is updated. Thus, after traversing all the unit numbers in the set list_elements, a plurality of subset list deltach_small_list corresponding to all the unit numbers in the set list_elements is obtained, and a finite element model Compinterface is obtained, wherein the finite element model Compinterface comprises all the generated surface units. In this case, the finite element model Comp face and the set list reduction_face_ele are deleted, and a set is created and named reduction_ele_list, and the plurality of subset list reduction_small_lists are sequentially stored into the set reduction_ele_list.
(3) A plurality of repeating surface unit pairs are determined from all the generated surface units, one repeating surface unit pair comprising two position repeating surface units.
In some embodiments, a finite element model Comp interface may be displayed, and a duplicate function may be used to find multiple duplicate surface unit pairs from the surface units included in the displayed finite element model Comp interface. Every time a duplicate face unit pair is found, a subset is newly created and named as a list duplicate_ele_list, and the unit number of each of the two face units in the duplicate face unit pair is stored into the subset list duplicate_ele_list. After finding all the repeating surface unit pairs, creating a set and named as a duplicate_element_list, and sequentially storing all the created subset list duplicate_element_list into the set duplicate_element_list.
(4) The subset list deltachsmall list in the set deltaelelist is traversed to perform a separate operation on the face unit of each target unit from the face units of other target units.
In this case the number of the elements to be formed is, for any subset list deltachsmalllist in the currently traversed set deltaelelist, the surface unit of the target unit corresponding to this subset list list_small_list may be separated from the surface units of other target units using a list function. In this case, the node information of the two face units identified by the two unit numbers in each subset list duplicate_ele_list in the set duplicate_element_list is different, that is, the two face units are separated.
(5) All subset list duplicate_ele_list in the set duplicate_element_list is traversed to obtain n sets of node information.
In this case, for any one subset list double_ele_list in the currently traversed set double_element_list, node information of each of the two face units identified by the two unit numbers in the subset list double_ele_list is obtained. Assuming that the two face units include a face unit a and a face unit B, the node information of the face unit a is denoted as list1{ M1, M2, … …, mk }, the node information of the face unit B is denoted as list2{ N1, N2, … …, nk }, the node numbers of the two nearest nodes are searched through list1 and list2 to determine the correspondence between the node numbers in the node information of the face unit a and the node numbers in the node information of the face unit B, and assuming that M1 corresponds to N1, M2 corresponds to N2, M3 corresponds to N3, and so on, mk corresponds to Nk, a subset is created and named as create_face_nodes, and all the node numbers in the node information of the face unit a and the face unit B are sequentially stored to the subset create_face_nodes 1 to obtain { M1, M2, … …, mk, N1, N2, … …, nk }. After traversing all the subsets of the subset list double_ele_list in the set double_element_list, obtaining a plurality of subsets of the subset create_simultaneous_nodes 1, creating a set and named as list create_simultaneous_nodes, and sequentially storing the subsets of the subset create_simultaneous_nodes 1 into the set list create_simultaneous_nodes.
(6) A finite element model Comp was created and named cohesives_zero_elements.
The finite element model Comp coherent zero elements is a finite element model of cohesive units.
(7) Traversing all the subset create_correct_nodes 1 in the set list create_correct_nodes to create a plurality of cohesive units, and storing the created cohesive units into the finite element model Comp correct_zero_elements.
When the cohesive force units are created according to the subset create_simultaneous_node1, the corresponding cohesive force units can be formed according to the nodes identified by the node numbers in the subset create_simultaneous_node1. Specifically, a plurality of nodes identified by the first half node number in the subset create_simultaneous_node1 may be sequentially connected, and a plurality of nodes identified by the second half node number in the subset create_simultaneous_node1 may be sequentially connected, and a plurality of nodes identified by the first half node number in the subset create_simultaneous_node1 and a plurality of nodes identified by the second half node number may be one-to-one connected to obtain a cohesive unit, and then the cohesive unit may be given a unit number.
For example, as shown in fig. 4, in the case where the finite element model Comp glue of the target structural member is a one-layer hexahedral mesh model shown in the (a) diagram of fig. 4, the generated finite element model Comp coherent_zero_elements of the cohesive force unit may be as shown in the (b) diagram of fig. 4.
For another example, as shown in fig. 5, in the case where the finite element model Comp glue of the target structural member is a three-layer hexahedral mesh model shown in fig. 5 (a), the generated finite element model Comp coherent_zero_elements of the cohesive force unit may be as shown in fig. 5 (b).
For another example, as shown in fig. 6, in the case where the finite element model Comp glue of the target structural member is a pentahedron mesh model shown in fig. 6 (a), the finite element model Comp coherent_zero_elements of the generated cohesive force unit may be as shown in fig. 6 (b).
Also for example, as shown in fig. 7, in the case where the finite element model Comp glue of the target structural member is a tetrahedral mesh model shown in fig. 7 (a), the finite element model Comp coherent_zero_elements of the generated cohesive force unit may be as shown in fig. 7 (b).
And a third step of: bulk properties are given to the finite element model Comp glue of the target structural member, and cohesive properties are given to the finite element model Comp coherent_zero_elements of the cohesive unit.
By way of example, the bulk properties of the finite element model Comp glue of the target structure may include density, elastic modulus, poisson's ratio, etc. Cohesive properties of the finite element model Comp coherent_zero_elements of the cohesive unit may include tensile stiffness, shear stiffness, tensile strength, shear strength, tensile fracture energy, shear fracture energy, and the like.
Fourth step: defining working conditions and other finite element models Comp, and finishing pretreatment.
The working conditions are used for indicating the connection relation between the target structural member and other components in the subsequent simulation process and indicating the operation required to be executed in the subsequent simulation process.
After the pretreatment is completed, a plurality of finite element models are obtained, including a finite element model Comp glue of the target structural member, a finite element model Comp coherent_zero_elements of the cohesive unit, and a finite element model Comp of other relevant components. Wherein, the finite element model Comp coherent_zero_elements of the cohesive unit is embedded in the finite element model Comp glue of the target structural member. The obtained plurality of finite element models can then be submitted to other software for simulation.
For example, as shown in fig. 8, the finite element model of the simplified glue crack may be established including a finite element model of the adherend, a finite element model of the glue layer in which the cohesive unit is inserted. The working conditions are as follows: the lower end of the adhered object is fixed, and the upper end of the adhered object applies an upward pulling force to simulate the tension cracking phenomenon of the adhesive layer. And then, submitting the finite element model of the glue cracking to other software for calculation so as to simulate the cracking phenomenon of the uniaxial tension glue body.
Fig. 9 is a schematic structural diagram of an apparatus for generating a cohesive force unit according to an embodiment of the present application, which may be implemented as part or all of a computer device, which may be the computer device described above in the embodiment of fig. 1, by software, hardware, or a combination of both. Referring to fig. 9, the apparatus includes:
the obtaining module 901 is configured to obtain a first finite element model, where the first finite element model is a finite element model of a target structural member, and the first finite element model includes m target units, where m is an integer greater than or equal to 2;
a first generating module 902, configured to generate a plurality of face units of each of the m target units;
a determining module 903, configured to determine n repeated surface unit pairs from a plurality of surface units of each of m target units, where each repeated surface unit pair in the n repeated surface unit pairs includes two surface units with repeated positions, and n is an integer greater than or equal to 2;
a second generating module 904, configured to generate n cohesive force units according to n repeating surface unit pairs.
Optionally, the first generating module 902 is configured to:
obtaining a unit identifier of each target unit in m target units;
and generating a plurality of surface units of any one target unit by using the surface unit generating function according to the unit identification of the target unit in the m target units.
Optionally, the apparatus further comprises:
a third generation module for generating a second finite element model including a plurality of face units for each of the m target units;
the determining module 903 is configured to:
displaying the second finite element model;
n repeating surface unit pairs are found from all surface units in the displayed second finite element model using a repeating unit finding function.
Optionally, the apparatus further comprises:
a first creating module, configured to create a first set, where the first set includes m first subsets corresponding to m target units one-to-one, and each first subset of the m first subsets includes a unit identifier of a corresponding target unit and a unit identifier of each of a plurality of surface units of the corresponding target unit;
a second creating module, configured to create a second set, where the second set includes n second subsets corresponding to n repeated surface unit pairs one to one, and each second subset in the n second subsets includes a unit identifier of each of two surface units included in the corresponding repeated surface unit pair;
the second generating module 904 is configured to:
generating n cohesive force units according to the first set and the second set.
Optionally, the second generating module 904 is configured to:
Separating the face unit of each of the m target units from the face units of other target units according to the m first subsets in the first set to update node information of the separated face units;
acquiring n groups of node information corresponding to n second subsets in the second set one by one, wherein each group of node information in the n groups of node information comprises node information of face units identified by each unit identifier in two unit identifiers included in the corresponding second subset;
generating n cohesive force units according to the n groups of node information.
Optionally, the second generating module 904 is configured to:
for any one of the n second subsets, acquiring node information of the face unit identified by each unit identifier in two unit identifiers included in the second subset to obtain two node information;
determining a corresponding relation between node identifiers in the two node information;
and sequentially adding the node identifiers in the two node information into a group of node information corresponding to a second subset according to the corresponding relation between the node identifiers in the two node information.
Optionally, the two nodes identified by the corresponding two node identifications in the correspondence between the node identifications in the two node information are two nodes closest to each other in the nodes identified by all the node identifications in the two node information;
The second generating module 904 is configured to:
all node identifiers in one node information in the two node information are added to a group of node information in sequence;
ordering all node identifiers in the other node information in the two node information according to the sequence of all node identifiers in the one node information and the corresponding relation between the node identifiers in the two node information;
and adding all node identifiers in the other node information after the ordering into one group of node information in sequence.
Optionally, the apparatus further comprises:
a fourth generation module for generating a third finite element model, the third finite element model comprising n cohesive force units;
and the setting module is used for setting the body attribute for the first finite element model and setting the cohesive force attribute for the third finite element model.
In the embodiment of the application, after the first finite element model of the target structural member is obtained, a plurality of surface units of each of m target units included in the first finite element model can be generated, n repeated surface unit pairs are determined from the surface units, and n cohesive force units are generated according to the n repeated surface unit pairs, so that n cohesive force units can be generated in batches.
It should be noted that: the apparatus for generating a cohesive unit according to the foregoing embodiment is only exemplified by the division of the functional modules, and in practical application, the functional modules may be allocated to different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to complete all or part of the functions described above.
The functional units and modules in the above embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the embodiments of the present application.
The device for generating the cohesive force unit and the method embodiment for generating the cohesive force unit provided in the foregoing embodiments belong to the same concept, and specific working processes and technical effects brought by the units and modules in the foregoing embodiments may be referred to a method embodiment section, which is not repeated herein.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, data subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium such as a floppy Disk, a hard Disk, a magnetic tape, an optical medium such as a digital versatile Disk (Digital Versatile Disc, DVD), or a semiconductor medium such as a Solid State Disk (SSD), etc.
The above embodiments are not intended to limit the present application, and any modifications, equivalent substitutions, improvements, etc. within the technical scope of the present application should be included in the scope of the present application.
Claims (6)
1. A method of generating cohesive force units, the method comprising:
acquiring a first finite element model, wherein the first finite element model is a finite element model of a target structural member, the first finite element model comprises m target units, and m is an integer greater than or equal to 2;
generating a plurality of surface units of each target unit in the m target units, and creating a first set, wherein the first set comprises m first subsets corresponding to the m target units one by one, and each first subset in the m first subsets comprises a unit identifier of the corresponding target unit and a unit identifier of each surface unit in the plurality of surface units of the corresponding target unit;
determining n repeated surface unit pairs from a plurality of surface units of each target unit in the m target units, and creating a second set, wherein each repeated surface unit pair in the n repeated surface unit pairs comprises two surface units with repeated positions, the second set comprises n second subsets corresponding to the n repeated surface unit pairs one to one, each second subset in the n second subsets comprises a unit identifier of each surface unit in the two surface units included in the corresponding repeated surface unit pair, and n is an integer greater than or equal to 2;
Traversing the m first subsets in the first set, and for one first subset traversed currently, separating the surface unit of the target unit corresponding to the one first subset from the surface units of other target units by using a unit separation function, wherein the unit separation function is used for separating two repeated units, and the separation of one surface unit from the other surface unit is: newly generating a node at the position of each of all nodes of the one face unit, and distributing the newly generated node to the other face unit to update the node information of the separated other face unit;
for any one second subset of the n second subsets in the second set, acquiring node information of the face unit identified by each unit identifier in the two unit identifiers included in the one second subset to obtain two node information; determining a corresponding relation between node identifiers in the two node information, wherein two nodes identified by the two corresponding node identifiers in the corresponding relation between the node identifiers in the two node information are two nodes which are closest to each other in the nodes identified by all the node identifiers in the two node information; sequentially adding all node identifiers in one node information in the two node information to a group of node information corresponding to the second subset; ordering all node identifiers in the other node information in the two node information according to the sequence of all node identifiers in the one node information and the corresponding relation between the node identifiers in the two node information; sequentially adding all node identifiers in the sorted other node information into the group of node information; sequentially connecting the plurality of nodes identified by the first half node identification in the set of node information, and sequentially connecting the plurality of nodes identified by the second half node identification in the set of node information, and connecting the plurality of nodes identified by the first half node identification and the plurality of nodes identified by the second half node identification in the set of node information one by one to obtain a cohesive unit.
2. The method of claim 1, wherein the generating the plurality of face units for each of the m target units comprises:
obtaining a unit identifier of each target unit in the m target units;
and generating a plurality of surface units of the target unit by using a surface unit generation function according to the unit identifier of any one target unit in the m target units.
3. The method of claim 1, wherein the method further comprises:
generating a second finite element model, the second finite element model comprising a plurality of face units for each of the m target units;
the determining n repeated surface unit pairs from the plurality of surface units of each of the m target units includes:
displaying the second finite element model;
the n repeating surface unit pairs are found from all surface units in the displayed second finite element model using a repeating unit finding function.
4. A method according to any one of claims 1 to 3, wherein the method further comprises:
after n cohesive force units are obtained, generating a third finite element model, wherein the third finite element model comprises the n cohesive force units;
Bulk properties are set for the first finite element model and cohesive properties are set for the third finite element model.
5. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, which computer program, when executed by the processor, implements the method according to any of claims 1 to 4.
6. A computer readable storage medium having instructions stored therein which, when run on a computer, cause the computer to perform the method of any of claims 1 to 4.
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