CN114186458A - Simulation method of connection structure - Google Patents
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Abstract
The invention relates to the technical field of automobile simulation, and discloses a simulation method of a connection structure, which comprises the following steps: respectively establishing models of a first to-be-connected part and a second to-be-connected part; establishing a first connection unit to simulate the connection characteristics of the connection structure under a preset condition, wherein the preset condition does not contain a target influence factor, and the target influence factor is a factor for enhancing the connection characteristics of the connection structure; and establishing a model of the second connection unit to simulate the influence of the target influence factor on the connection characteristic of the connection structure. According to the simulation method of the connection structure, the connection characteristics of the connection structure are simulated through the first connection unit and the second connection unit, the simulation results corresponding to the preset conditions and the target influence factors can be obtained respectively, the result information obtained in the simulation process is increased, more flexible modeling can be achieved, and the simulation analysis capability and the reverse design development capability can be improved.
Description
Technical Field
The invention relates to the technical field of automobile simulation, in particular to a simulation method of a connection structure.
Background
In the design process of the vehicle, finite element simulation is increasingly adopted to simulate the response of the vehicle body under various working conditions, so that the aims of reducing the research and development cost and shortening the research and development period are fulfilled. Among them, the snap connection is one of the most common connection methods in automobiles, and is generally applied to the connection of structures such as a body guard plate and a door sheet metal. For the simulation of the whole body of the vehicle, the mesh size of the buckle is limited due to the small geometric dimension of the buckle, and the whole calculation efficiency is greatly influenced according to actual modeling, so that the simplification of the buckle is generally considered.
In the prior art, a connecting unit is usually adopted to replace a buckle, and two pieces to be connected are connected through the connecting unit so as to simplify and simulate the buckle. However, the modeling method usually only considers the static connection characteristic of the buckle, and neglects the dynamic connection characteristic of the buckle. Even if material parameters such as damping are defined in the connecting unit, the simulation method can only obtain simulation results under the comprehensive action of the damping, the definition of failure of the connecting unit and the like is also required to be based on calculation results under the comprehensive action, such as stress under the comprehensive action, in practical situations, the buckle is a purchased part, suppliers often only provide the pull-out strength of the buckle under a static condition, and the buckle with a proper specification is difficult to directly select from a dynamic simulation result in a design process, so that the design process and the research and development period of a vehicle are influenced.
Disclosure of Invention
The invention aims to provide a simulation method of a connection structure, which can realize the simulation of the static connection characteristic and the dynamic connection characteristic of the connection structure, realize more flexible modeling and improve the simulation analysis capability and the reverse design development capability.
Therefore, the invention adopts the following technical scheme:
a simulation method of a connecting structure comprises a first to-be-connected part, a second to-be-connected part and a connecting part, wherein the first to-be-connected part and the second to-be-connected part are connected through the connecting part, and the simulation method of the connecting structure comprises the following steps:
respectively establishing a model of a first part to be connected and a model of a second part to be connected;
establishing a first connecting unit, wherein the first connecting unit is respectively connected with a model of a first to-be-connected part and a model of a second to-be-connected part so as to simulate the connecting characteristic of a connecting structure under a preset condition, and the preset condition does not contain a target influence factor which is a factor for enhancing the connecting characteristic of the connecting structure;
and establishing a second connecting unit, wherein the second connecting unit is respectively connected with the model of the first to-be-connected part and the model of the second to-be-connected part so as to simulate the influence of the target influence factor on the connection characteristic of the connection structure.
As a preferable aspect of the simulation method of the connection structure, the first connection unit and the second connection unit are provided in a superposed manner.
As a preferred embodiment of the simulation method for the connection structure, the step of establishing the first connection unit further includes defining a failure model of the first connection unit;
the step of establishing the second connection unit further comprises defining a failure model of the second connection unit.
As a preferable aspect of the simulation method of the connection structure, the first connection unit and the second connection unit are configured to fail at the same time.
As a preferred scheme of the simulation method of the connection structure, the first connection unit and the second connection unit both adopt a failure criterion based on displacement, and the failure displacement of the first connection unit is the same as the failure displacement of the second connection unit.
As a preferred scheme of the simulation method of the connection structure, the preset condition is a static condition or a quasi-static condition, and the target influence factor is a loading speed.
As a preferable aspect of the simulation method of the connection structure, the step of establishing the first connection unit further includes:
defining a material model of the first connection unit, the material model of the first connection unit comprising stiffness in six degrees of freedom;
the step of establishing the second connection unit further comprises:
a material model of the second connection unit is defined, the material model of the second connection unit including a damping coefficient in a direction in which the first to-be-connected member and the second to-be-connected member approach or separate from each other.
As a preferable aspect of the simulation method of the connection structure, before defining the material characteristics of the first connection unit, the method further includes:
and obtaining the connection rigidity of the connection structure in six-degree-of-freedom directions under the preset condition.
As a preferred scheme of the simulation method of the connection structure, the step of obtaining the connection stiffness of the connection structure in the six-degree-of-freedom direction under the preset condition specifically includes:
respectively establishing a model of the connecting piece and a model of a second to-be-connected piece;
assembling the model of the connecting piece and the model of the second piece to be connected to form an assembling model of the connecting structure;
and loading the assembly model in six freedom degrees to obtain the rigidity characteristics in the six freedom degrees.
As a preferable scheme of the simulation method of the connection structure, before the loading of the assembly model in the six-degree-of-freedom direction, the method further includes verifying the accuracy of the assembly model, and the step of verifying the accuracy of the assembly model includes:
loading the model of the connecting piece and/or the model of the second piece to be connected so as to obtain a connection and/or separation simulation curve of the model of the connecting piece and the model of the second piece to be connected;
the connection structure is tested to obtain a connection and/or separation test curve, and the simulation curve is compared with the test curve.
As a preferable embodiment of the simulation method of the connection structure, before defining the material model of the second connection unit, the method further includes:
and obtaining the damping coefficient of the connecting structure along the direction in which the first to-be-connected member and the second to-be-connected member approach or separate from each other.
As an optimal scheme of the simulation method of the connection structure, the number of the target influence factors is at least two, and the second connection units are arranged in one-to-one correspondence with the target influence factors.
As a preferred scheme of a simulation method of a connection structure, two ends of a first connection unit are respectively coupled with a first to-be-connected component and a second to-be-connected component through rigid units; and/or
Two ends of the first connecting unit are respectively coupled with the first to-be-connected piece and the second to-be-connected piece through the rigid unit.
The invention has the beneficial effects that:
the invention provides a simulation method of a connection structure, which specifically comprises the following steps: respectively establishing a model of a first to-be-connected part and a model of a second to-be-connected part, establishing a first connection unit to simulate the connection characteristic of a connection structure under a preset condition, wherein the preset condition does not contain a target influence factor, the target influence factor is a factor for enhancing the connection characteristic of the connection structure, and establishing a second connection unit to simulate the influence of the target influence factor on the connection characteristic of the connection structure. According to the simulation method of the connection structure, the connection characteristics of the connection structure are simulated through the first connection unit and the second connection unit, the simulation results corresponding to the preset conditions and the target influence factors at all times can be obtained respectively, the result information obtained in the simulation process is enlarged, more flexible modeling can be achieved, and the simulation analysis capability and the reverse design development capability are improved.
Drawings
Fig. 1 is a first flowchart of a simulation method of a connection structure according to an embodiment of the present invention;
fig. 2 is a second flowchart of a simulation method of a connection structure according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, this embodiment provides a simulation method of a connection structure, where the connection structure includes a first to-be-connected component, a second to-be-connected component, and a connecting component, and the first to-be-connected component and the second to-be-connected component are connected by the connecting component, and the simulation method of the connection structure includes the following steps:
s100, respectively establishing a model of a first to-be-connected part and a model of a second to-be-connected part;
s110, establishing a first connecting unit, wherein the first connecting unit is respectively connected with a model of a first to-be-connected part and a model of a second to-be-connected part so as to simulate the connecting characteristic of the connecting structure under a preset condition, and the preset condition does not contain a target influence factor which is a factor for enhancing the connecting characteristic of the connecting structure;
and S120, establishing a second connecting unit, wherein the second connecting unit is respectively connected with the model of the first to-be-connected part and the model of the second to-be-connected part so as to simulate the influence of the target influence factor on the connection characteristic of the connection structure.
According to the simulation method of the connection structure, the connection characteristic of the connection structure is simulated by the first connection unit and the second connection unit together, the first connection unit and the second connection unit can be flexibly set, flexible modeling is achieved, simulation results corresponding to preset conditions and target influence factors are obtained respectively, result information capable of being obtained in the simulation process is increased, the capability of simulation analysis and the capability of reverse design development are improved, and the research and development period is shortened.
In this embodiment, the first connecting piece of treating specifically indicates the door panel beating, and the second is treated the connecting piece and specifically indicates the automobile body backplate, and the joint hole has been seted up to the connecting piece specifically indicates the buckle on the automobile body backplate, and the buckle can the joint in the joint hole on the automobile body backplate to realize the connection of door panel beating and automobile body backplate. Of course, the simulation method of the connection structure is not only suitable for simulation of the connection structure including the buckle, but also suitable for simulation of other types of connection structures, and can be set according to actual needs, and the embodiment does not limit the simulation method.
It can be understood that the step of establishing the model of the first to-be-connected component and the step of establishing the model of the second to-be-connected component in step S100 are common steps in finite element simulation, and include establishing a geometric model, meshing, defining material properties, defining boundary conditions and constraints, and the like.
In this embodiment, the preset condition is a static or quasi-static condition, and the target influencing factor is a loading speed, that is, the first connection unit is configured to simulate a connection characteristic of the first to-be-connected component and the second to-be-connected component under the static or quasi-static condition, the second connection unit is configured to simulate an influence of the loading speed on the connection characteristic of the first to-be-connected component and the second to-be-connected component, and the first connection unit and the second connection unit jointly represent the connection characteristic of the connection structure. Therefore, when the stress at the connecting structure is obtained in the whole vehicle simulation, the buckle with a proper specification can be directly selected according to the simulation result of the first connecting unit, and the design and development period of the whole vehicle is shortened. Wherein, the buckle with proper specification refers to the buckle with static pull-out strength meeting the requirement.
Certainly, the preset condition and the target influence factor are not limited to these, in other embodiments, the preset condition may also be a static or quasi-static condition at a preset temperature, and the target influence factor is a working temperature, and may be set according to actual simulation needs, which is not limited in this embodiment.
It can be understood that, when the number of the target influencing factors is at least two, the number of the second connecting units may be at least two, and the second connecting units are arranged in one-to-one correspondence with the target influencing factors to respectively simulate the influence of each target influencing factor on the connection characteristics of the connection structure, so as to further improve the flexibility of modeling and the simulation analysis capability.
Specifically, as shown in fig. 1 in conjunction with fig. 2, the step of establishing the first connection unit in step S110 further includes:
and step S111, defining a material model of the first connecting unit, wherein the material model of the first connecting unit comprises rigidity in six-degree-of-freedom directions. The stiffness in the six degree of freedom direction may be denoted as E1、E2、E3、E12、E13And E23Wherein E represents the elastic modulus, and 1, 2 and 3 represent three directions orthogonal to each other. Therefore, the first connecting unit can represent a static response part of the connecting structure model when the connecting structure model is subjected to external load, and the static response simulation precision of the first connecting unit can be improved by considering the rigidity in the six-degree-of-freedom direction, so that the simulation precision of the connecting structure is improved.
Further, the step of establishing the second connection unit in step S120 further includes:
step S121, defining a material model of the second connection unit, where the material model of the second connection unit includes a damping coefficient in a direction in which the first to-be-connected member and the second to-be-connected member approach or separate from each other, and the damping coefficient in the direction may be represented as c.
The influence of the loading speed on the dynamic connection performance of the buckle is mainly reflected in the pulling-out direction of the buckle, so that the dynamic simulation requirement of the connection structure can be met only by defining the damping coefficient in one direction, meanwhile, the calculation efficiency of a connection structure model can be improved, and the calculation efficiency of the whole vehicle simulation is ensured. Of course, the arrangement of the second connection unit is not limited to this, and in other embodiments, when modeling other types of connection structures, damping coefficients in multiple degrees of freedom directions may also be simultaneously defined according to simulation needs, and may be arranged according to actual simulation needs, which is not limited in this embodiment.
Preferably, the first connecting unit and the second connecting unit are arranged in a superposed manner, so that the simulation precision of the simulation method of the connecting structure can be further improved, and the calculation error caused by the dislocation between the first connecting unit and the second connecting unit can be reduced. Of course, in other embodiments, the first connection unit and the second connection unit may also be arranged at an interval or side by side, and may be arranged according to actual simulation requirements, which is not limited in this embodiment.
In this embodiment, the finite element analysis software is ABAQUS, the first connecting unit and the second connecting unit are both shifting units, and two ends of the shifting unit are respectively connected with the first to-be-connected component and the second to-be-connected component. Certainly, the types of the first connecting unit and the second connecting unit and the type of the finite element analysis software are not limited thereto, in other embodiments, the Pbush unit in the NASTRAN may be used to simulate the first connecting unit and the second connecting unit, or other types of units, such as a spring unit, may be used according to actual simulation needs, in addition, the first connecting unit and the second connecting unit may also be used in different unit types, and may be set according to actual simulation needs, which is not limited in this embodiment.
In this embodiment, two ends of the first connecting unit are coupled with the first to-be-connected component and the second to-be-connected component through the rigid unit, so as to realize connection between the first connecting unit and the first to-be-connected component and the second to-be-connected component. Of course, the connection mode of the first connection unit and the first to-be-connected component and the second to-be-connected component is not limited to this, and may be set according to actual simulation needs.
Similarly, two ends of the second connecting unit can be coupled with the first to-be-connected component and the second to-be-connected component through the rigid unit, so that the second connecting unit is connected with the first to-be-connected component and the second to-be-connected component. Of course, the second connection unit may also be connected to the first to-be-connected component and the second to-be-connected component in a connection manner different from that of the first connection unit, and the connection may be set according to actual simulation needs, which is not limited in this embodiment.
Preferably, the step of establishing the first connection unit in step S110 further includes:
step S112, defining a failure model of the first connecting unit;
the step of establishing the second connection unit in step S120 further includes:
and step S122, defining a failure model of the second connecting unit, so that the first connecting unit and the second connecting unit can fail when the external load reaches a certain condition, and simulating the first to-be-connected part and the second to-be-connected part to be separated under the action of the external load.
Preferably, the first connecting unit and the second connecting unit are configured to fail simultaneously, so as to improve the simulation accuracy of the connecting structure, thereby further improving the simulation accuracy of the whole vehicle. Of course, the failure setting of the first connection unit and the second connection unit is not limited to this, and in other embodiments, the first connection unit and the second connection unit may not be set to fail simultaneously, and may be set according to the actual simulation requirement, which is not limited in this embodiment.
In this embodiment, the first connection unit and the second connection unit both use the failure criterion based on displacement, and the failure displacement of the first connection unit is the same as the failure displacement of the second connection unit.
For example, taking the first connection unit as an example, the failure displacement of the first connection unit can be simplified to be the sum of the original length L of the first connection unit and the displacement variation Δ L of the buckle from the clamping state to the position just separated from the second to-be-connected component.
Certainly, the failure criterion of the first connection unit and the failure criterion of the second connection unit are not limited to these, and in other embodiments, the failure criterion of the first connection unit may also be a failure criterion based on a separation stress under a preset condition, that is, when the stress of the first connection unit reaches the static tensile strength of the connection structure, the first connection unit fails, the second connection unit may synchronously fail with the first connection unit in a manner such as a subroutine, or a failure criterion different from that of the first connection unit may be adopted, and may be set according to actual simulation needs, which is not limited in this embodiment.
It can be understood that, since the failure stress of the first connection unit can be directly defined as the static tensile strength of the connection structure, under the condition of high-speed loading simulation, whether the buckle (determined by the static tensile strength) with such specification can meet the design requirement can be directly known, so that the reverse design development capability is improved.
Preferably, before the step S121 of defining the material model of the first connection unit, the method further includes:
and S200, obtaining the connection rigidity of the connection structure in six freedom degrees under the preset condition.
Specifically, step S200 specifically includes:
s201, respectively establishing a model of a connecting piece and a model of a second to-be-connected piece;
s202, assembling the model of the connecting piece and the model of the second to-be-connected piece to obtain an assembly model of the connecting structure;
and S203, loading the assembly model in six freedom degrees to obtain the connection rigidity in the six freedom degrees.
The connection rigidity of the connection structure in the six-degree-of-freedom direction is obtained by establishing the assembly model of the connection structure, the connection rigidity in the six-degree-of-freedom direction can be conveniently obtained, the time cost and the test cost required by a large number of tests are avoided, and the whole vehicle research and development process can be accelerated.
It will be appreciated that the stiffness of the connection in each degree of freedom can be obtained from the force-displacement curve of the assembled model. Specifically, a force-displacement curve of the assembly model is fitted, and the obtained slope is the connection stiffness in the direction of the degree of freedom.
Wherein, step S201 specifically includes:
s2011, respectively establishing a geometric model of a connecting piece and a geometric model of a second to-be-connected piece, and respectively dividing the geometric model of the connecting piece and the geometric model of the second to-be-connected piece into grids, wherein the geometric model of the connecting piece and the geometric model of the second to-be-connected piece can be established based on three-dimensional geometric data of the existing connecting piece and the second to-be-connected piece, and can also reversely deduce the three-dimensional geometric data based on a real object of the connecting piece and the second to-be-connected piece;
s2012, defining material models of the connecting component and the second component to be connected, where parameters required for establishing the material models of the connecting component and the second component to be connected can be obtained from corresponding material manuals.
Further, in order to ensure the simulation accuracy of the fitting model and to improve the simulation efficiency as much as possible, in step S2011, a smaller mesh, for example, a mesh having a size of about 0.1mm, is used for the connecting member and the portion of the second to-be-connected member, which may be in contact with the connecting member, and the quality of this portion of the mesh is ensured, and a larger mesh, for example, a mesh having a size of about 0.5mm, may be used for the other portion, so as to ensure the simulation efficiency of the fitting model.
The following describes specific steps of assembling the models of the connecting member and the second member to be connected to obtain an assembled model of the connecting structure.
Optionally, step S202 specifically includes:
s2021, assembling the model of the connecting piece into a model of a second to-be-connected piece;
s2022, defining contact properties of the model of the connection member and the model of the second member to be connected, for example, using a contact method of a universal contact, and setting a friction coefficient between the model of the connection member and the model of the second member to be connected to 0.1.
Of course, the connection stiffness of the connection structure in the direction of six degrees of freedom is not limited to this, and in other embodiments, the connection stiffness of the connection structure may be obtained through a loading test of six degrees of freedom, and may be set according to actual needs.
Preferably, before the loading of the assembly model in six-degree-of-freedom directions in step S203, the method further includes:
and step S300, verifying the precision of the assembly model to ensure the accuracy of the connection rigidity of the connection structure in six freedom directions, so as to improve the simulation precision of the simulation method of the connection structure.
Exemplarily, step S300 specifically includes:
s301, loading the model of the connecting piece and/or the model of the second to-be-connected piece to obtain a connection and/or separation simulation curve of the model of the connecting piece and the model of the second to-be-connected piece;
s302, performing connection and/or separation tests on the connection structure to obtain a connection and/or separation test curve, and comparing the simulation curve with the test curve to obtain the error size of the assembly model. The assembly model can be further improved and debugged according to the error size, and the precision of the improved and debugged assembly model is verified again, so that the simulation precision of the assembly model can meet the simulation requirement.
It can be understood that, before the accuracy verification of the assembly model, the model of the connecting piece is assembled in the second piece to be connected, and when the separation simulation curve of the connecting piece and the second piece to be connected is obtained, the model of the connecting piece and/or the model of the second piece to be connected can be directly loaded to obtain the separation simulation curve; when obtaining the connection simulation curve of the connecting piece and the second piece to be connected, it is necessary to adjust the relative position between the model of the connecting piece and the model of the second piece to be connected and separate the model of the connecting piece from the model of the second piece to be connected, and then load the model of the connecting piece and/or the model of the second piece to be connected to obtain the connection simulation curve.
Preferably, in order to ensure the reliability of the precision verification of the assembly model, it is necessary to reduce the difference between the assembly model and the connection structure in the test as much as possible, and for this reason, the step of loading the connection member and/or the second member to be connected in step S301 specifically includes:
and establishing a model of the clamp, connecting the model of the clamp with the model of the connecting piece and/or the model of the second to-be-connected piece, and loading the model of the connecting piece and/or the model of the second to-be-connected piece through the clamp, so that the difference between simulation and test can be further reduced, the influence of boundary conditions and constraints on a simulation result is reduced, and the reliability of precision verification of an assembly model is improved.
Of course, the manner of loading the connecting element and/or the second to-be-connected element is not limited to this, and in other embodiments, constraints and boundary conditions may also be directly applied to the connecting element and/or the second to-be-connected element to reduce the modeling workload and improve the calculation efficiency, and the method may be set according to actual simulation needs, which is not limited in this embodiment.
Illustratively, taking the separation of the connecting member and the second member to be connected as an example, the error of the fitting model is calculated as follows:
determining the maximum value m of the simulation curve and the maximum value n of the test curve, wherein the number of the maximum values of the test curve is more than n because the test is frequently repeatedi；
Thus, the error e in the separation of the assembly model can be defined as:
e＝min(m,ni)/max(m,ni)
of course, the method for calculating the error of the assembly model is not limited to this, and other methods may be used to calculate the error, which is not limited in this embodiment.
Optionally, before the step S121 of defining the material model of the second connection unit, the method further includes:
s400, obtaining a damping coefficient c of the connecting structure along the direction that the first to-be-connected piece and the second to-be-connected piece are close to or separated from each other.
For example, the damping coefficient c may be obtained by multiple loading tests of the connection structure at different loading speeds. Taking separation as an example, the separating force F (v) at different loading speeds is approximately equal to the separating force F at the static loading speedQuietThe sum of the product of the damping coefficient c and the velocity v, i.e.:
F(v)＝Fquiet+cv
Therefore, the damping coefficient c can be obtained by fitting based on a plurality of groups of acting forces F (v) under different loading speeds in the separation process and substituting the formula.
In the description of the present specification, it is to be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or structure referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A simulation method of a connection structure is characterized in that the connection structure comprises a first to-be-connected part, a second to-be-connected part and a connecting part, the first to-be-connected part and the second to-be-connected part are connected through the connecting part, and the simulation method of the connection structure comprises the following steps:
respectively establishing a model of a first part to be connected and a model of a second part to be connected;
establishing a first connecting unit, wherein the first connecting unit is respectively connected with a model of a first to-be-connected part and a model of a second to-be-connected part so as to simulate the connecting characteristic of a connecting structure under a preset condition, and the preset condition does not contain a target influence factor which is a factor for enhancing the connecting characteristic of the connecting structure;
and establishing a second connecting unit, wherein the second connecting unit is respectively connected with the model of the first to-be-connected part and the model of the second to-be-connected part so as to simulate the influence of the target influence factor on the connection characteristic of the connection structure.
2. The simulation method of a connection structure according to claim 1, wherein the first connection unit and the second connection unit are provided in coincidence.
3. The method for simulating a connection structure according to claim 1, wherein the step of establishing the first connection unit further comprises defining a failure model of the first connection unit;
the step of defining the second connection unit further comprises defining a failure model of the second connection unit.
4. The simulation method of a connection structure according to claim 3, wherein the first connection unit and the second connection unit are configured to fail simultaneously.
5. The method for simulating a connection structure according to claim 3, wherein the first connection unit and the second connection unit both use a failure criterion based on displacement, and the failure displacement of the first connection unit is the same as the failure displacement of the second connection unit.
6. The method for simulating a connection structure according to claim 1, wherein the predetermined condition is a static condition or a quasi-static condition, and the target influencing factor is a loading speed.
7. The method for simulating a connection structure according to claim 6, wherein the step of establishing the first connection unit further comprises:
defining a material model of the first connection unit, the material model of the first connection unit comprising stiffness in six degrees of freedom;
the step of establishing the second connection unit further comprises:
a material model of the second connection unit is defined, the material model of the second connection unit including a damping coefficient in a direction in which the first to-be-connected member and the second to-be-connected member approach or separate from each other.
8. The method for simulating a connection structure according to claim 7, further comprising, before defining the material model of the first connection unit:
and obtaining the connection rigidity of the connection structure in six-degree-of-freedom directions under the preset condition.
9. The method for simulating the connection structure according to claim 8, wherein the step of obtaining the connection stiffness of the connection structure in the six-degree-of-freedom direction under the preset condition specifically includes:
respectively establishing a model of the connecting piece and a model of a second to-be-connected piece;
assembling the model of the connecting piece and the model of the second piece to be connected to form an assembling model of the connecting structure;
and loading the assembly model in six freedom degrees to obtain the rigidity characteristics in the six freedom degrees.
10. The method for simulating a connection structure according to claim 9, further comprising verifying the accuracy of the fitting model before the six-degree-of-freedom directional loading of the fitting model, the step of verifying the accuracy of the fitting model comprising:
loading the model of the connecting piece and/or the model of the second piece to be connected so as to obtain a connection and/or separation simulation curve of the model of the connecting piece and the model of the second piece to be connected;
the connection structure is tested to obtain a connection and/or separation test curve, and the simulation curve is compared with the test curve.
11. The method for simulating a connection structure according to claim 7, further comprising, before defining the material model of the second connection unit:
and obtaining the damping coefficient of the connecting structure along the direction in which the first to-be-connected member and the second to-be-connected member approach or separate from each other.
12. The simulation method of a connection structure according to any one of claims 1 to 11, wherein the number of the target influencing factors is at least two, and the second connection units are provided in one-to-one correspondence with the target influencing factors.
13. The simulation method of the connection structure according to any one of claims 1 to 11, wherein both ends of the first connection unit are coupled with the first member to be connected and the second member to be connected through the rigid units, respectively; and/or
Two ends of the first connecting unit are respectively coupled with the first to-be-connected piece and the second to-be-connected piece through the rigid unit.
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