CN116108723A - Method and device for processing measurement data in plate deformation process - Google Patents
Method and device for processing measurement data in plate deformation process Download PDFInfo
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- CN116108723A CN116108723A CN202310189735.2A CN202310189735A CN116108723A CN 116108723 A CN116108723 A CN 116108723A CN 202310189735 A CN202310189735 A CN 202310189735A CN 116108723 A CN116108723 A CN 116108723A
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Abstract
The invention relates to the technical field of material processing, in particular to a method and a device for processing measurement data in a plate deformation process. To the inhomogeneous pressure that receives the panel can't carry out the problem of reasonable effectual processing, this scheme includes: generating a non-uniform pressure function taking bulging time as a variable according to the measured data; adjusting the non-uniform pressure function for a plurality of times, so that the pressure function after each adjustment gradually tends to the uniform pressure function; taking each pressure function as an externally applied load condition respectively to carry out finite element simulation on the deformation process of the plate; based on each simulation result, respectively determining a stress path and a strain path of each node on the plate under the corresponding externally applied load condition; and analyzing the stress paths and the strain paths to determine the rule of influence of the non-uniform pressure on the deformation of the plate. According to the scheme, the influence rule of the non-uniform pressure on the deformation of the plate can be determined, so that the analysis and the control of the deformation process of the plate can be realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of plastic forming of plates, in particular to a method and a device for processing measurement data in a plate deformation process.
Background
The interaction between the sheet and the force transmitting tool determines the deformation behaviour of the sheet during the sheet forming process. The sheet is subjected to pressure perpendicular to the surface and tangential forces parallel to the surface, the former often being non-uniform, except for hydraulic or pneumatic forming, the latter being affected by the former. Therefore, it is necessary to investigate the effect of non-uniform pressure on sheet deformation. Because the stressed surface of the plate is in a closed state, few direct measurement techniques for non-uniform pressure are available, and the treatment method for the measured non-uniform pressure is also rarely reported.
At present, the research on the non-uniform pressure of the plate is mainly carried out by finite element simulation, and the calculated non-uniform pressure is output. How to reasonably and effectively process the non-uniform pressure of the plate so as to realize the analysis and control of the deformation process of the plate is a main problem at present.
Disclosure of Invention
The embodiment of the invention provides a processing method and a processing device for measurement data in a plate deformation process, which can reasonably and effectively process uneven pressure applied to a plate so as to realize analysis and control in the plate deformation process.
In a first aspect, an embodiment of the present invention provides a method for processing measurement data in a sheet deformation process, including:
acquiring corresponding measurement data when the plate is expanded to each of a plurality of preset expansion heights; the measurement data at least comprise bulging time and non-uniform pressure to which the sheet material is subjected;
generating a non-uniform pressure function taking bulging time as a variable according to the measurement data;
adjusting the non-uniform pressure function for a plurality of times, so that the pressure function after each adjustment gradually tends to be the uniform pressure function;
taking the non-uniform pressure function and the pressure function after each adjustment as external load conditions respectively, and carrying out finite element simulation on the plate deformation process by utilizing each external load condition respectively;
based on each simulation result, respectively determining a stress path and a strain path of each node on the plate under the corresponding externally applied load condition;
and analyzing the stress paths and the strain paths to determine the rule of influence of the non-uniform pressure on the deformation of the plate.
In a second aspect, an embodiment of the present invention further provides a device for processing measurement data in a plate deformation process, including:
a data acquisition unit for acquiring corresponding measurement data when the plate is expanded to each of a plurality of preset expansion heights; the measurement data at least comprise bulging time and non-uniform pressure to which the sheet material is subjected;
a function determining unit for generating a non-uniform pressure function with bulging time as a variable according to the measurement data; and adjusting the non-uniform pressure function a plurality of times so that the pressure function after each adjustment gradually tends to the uniform pressure function;
the simulation unit is used for taking the non-uniform pressure function and the pressure function after each adjustment as external load conditions respectively, and carrying out finite element simulation on the plate deformation process by utilizing each external load condition respectively;
the data determining unit is used for respectively determining stress paths and strain paths of all nodes on the plate under the corresponding externally applied load condition based on each simulation result;
and the analysis unit is used for analyzing the stress paths and the strain paths and determining the rule of influence of the non-uniform pressure on the deformation of the plate.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the method described in any embodiment of the present specification is implemented.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed in a computer, causes the computer to perform a method according to any of the embodiments of the present specification.
The embodiment of the invention provides a processing method and a processing device for measuring data in a plate deformation process, which can obtain a non-uniform pressure function according to the measured data, gradually trend the pressure function after each adjustment to the uniform pressure function by adjusting the non-uniform pressure function for multiple times, and respectively perform finite element simulation on the plate deformation process by using the non-uniform function and the pressure function after each adjustment as an externally-applied load condition, so that stress paths and strain paths of all nodes on the plate under the corresponding externally-applied load condition can be determined.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for processing measurement data during deformation of a sheet material according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of non-uniform pressure corresponding to different bulging heights provided by an embodiment of the present invention;
FIG. 3 is a hardware architecture diagram of an electronic device according to an embodiment of the present invention;
fig. 4 is a block diagram of a processing device for measuring data in a plate deformation process according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
The non-uniform pressure applied to the plate in the deformation process can be obtained by a finite element simulation mode or a pressure sensitive film measurement mode, but a processing method for non-uniform pressure data is lacked. However, the non-uniform pressure has very important influence on the deformation of the plate, based on the influence, the measurement data of the non-uniform pressure can be processed to analyze the influence rule of the non-uniform pressure on the deformation of the plate, so that technical support is provided for researching the deformation behavior of the plate by the non-uniform pressure, and advanced technical means are provided for improving the forming performance of the plate.
Specific implementations of the above concepts are described below.
Referring to fig. 1, an embodiment of the present invention provides a method for processing measurement data in a plate deformation process, where the method includes:
and 110, analyzing the stress paths and the strain paths to determine the rule of influence of the non-uniform pressure on the deformation of the plate.
According to the embodiment of the invention, the non-uniform pressure function can be obtained according to the measurement data, the non-uniform pressure function is regulated for a plurality of times, so that the pressure function after each regulation gradually tends to be uniform, the non-uniform function and the pressure function after each regulation are used as external load conditions to carry out finite element simulation on the plate deformation process, so that the stress path and the strain path of each node on the plate under the corresponding external load conditions can be determined.
The manner in which the individual steps shown in fig. 1 are performed is described below.
Firstly, aiming at step 100', obtaining corresponding measurement data when the plate is swelled to each of a plurality of preset swelling heights; the measurement data includes at least a bulging time and a non-uniform pressure to which the sheet material is subjected and step 102 of generating a non-uniform pressure function with the bulging time as a variable from the measurement data.
In order to determine the law of influence of different non-uniform press forming on the sheet deformation, measurement data in the medium press forming of interest can be processed. In this embodiment, the processing of measurement data will be described by taking the case of pressure forming of a viscous medium and the case of bulging of a disk as an example of deformation of a plate, and the processing of measurement data in pressure forming of other mediums will be the same.
In the embodiment of the present invention, the ways of obtaining the measurement data in step 100 may include at least two ways, the first way is to perform a plate bulging experiment, perform data measurement on the experimental process, and take the measurement data as input; the second is to calculate by finite element simulation to output the non-uniform pressure at each bulging time.
In a first manner, the acquiring measurement data may include: receiving input measurement data corresponding to each bulging height; the measurement data are respectively measured for each bulging height of the sheet bulging to a plurality of preset bulging heights.
In the first mode, a direct measurement mode is required to be adopted for measurement, wherein, for each bulging height in a plurality of preset bulging heights, the measurement method of measurement data corresponding to the bulging height when the sheet material is bulged, may include:
before the plate bulging, the pressure sensitive films are arranged on the stress side of the plate in a set distribution mode;
and after the plate is swelled to the swelling height, recording the swelling time, taking down the set pressure sensitive film, and collecting the pressure value of the pressure sensitive film to obtain the non-uniform pressure born by the plate.
In the embodiment of the invention, when the pressure sensitive film is arranged, the pressure sensitive film can be cut into square shapes, and the pressure sensitive films with the square shapes are arranged on the stress side of the plate. Wherein the side length of the square can be 3-5 mm. Wherein, the pressure sensitive film can adopt a double-sheet pressure sensitive film.
In the embodiment of the invention, the setting distribution mode can be in a cross shape or a rice shape. The plurality of pressure sensitive films can be arranged at even intervals. Such as a 5mm spacing length.
Taking the plate radius of 30mm as an example, the distribution mode is that the distribution mode is in a cross shape along the diameter of the plate, and the nodes with the node radii of 5, 10, 15, 20 and 25mm on the plate are selected as pressure acquisition points, so that 4 pressure acquisition points can be obtained for each node radius, and the center points of the pressure sensitive films are arranged in one-to-one correspondence with the pressure acquisition points.
The bulging heights of the sheet material are determined, for example, 10, 12, 14, 16, 18, 20mm, respectively.
Taking bulging to 10mm as an example, after bulging to 10mm, recording bulging time, sequentially taking down the set pressure sensitive films, and processing experimental results of the pressure sensitive films by using FPD8010 software to obtain non-uniform pressure distribution of the plate when the plate is bulged to the maximum bulging height (namely 10 mm), so as to obtain measurement data with the bulging height of 10 mm.
Next, a new sheet is retrieved, and the sheet parameters of the new sheet are the same as those of the previous sheet deformation experiment. The new sheet was expanded to 12mm to obtain measurement data of an expansion height of 12 mm. The other bulging heights are the same, and measurement data corresponding to the bulging heights 10, 12, 14, 16, 18 and 20mm respectively are obtained.
In order to ensure the accuracy of the measured pressure value, the average pressure of the square area with 50-70% of the side length of the pressure sensitive film is used as the measured pressure value, so as to prevent the pressure influence caused by the artificial effect of the edge part of the pressure sensitive film in the pasting process and the film taking process.
Before taking the pressure sensitive films, the current coordinate of each pressure sensitive film is measured, and the current coordinate can also be used as measurement data for analysis. Please refer to fig. 2, which is a schematic diagram of non-uniform pressure corresponding to different bulging heights. As can be seen from fig. 2, after the deformation of the plate material is completed, the pressure sensitive adhesive sheet changes not only in height but also in node radius.
In step 102, in order to determine the rule of influence of the non-uniform pressure on the deformation of the sheet, finite element simulation is required to be performed on the deformation process of the sheet, and the finite element simulation is based on the expansion time and the simulation of the non-uniform pressure, so that the relationship between the expansion time and the non-uniform pressure is required to be known.
In one mode, based on the measurement data, the bulging time and the non-uniform pressure to which the sheet is subjected can be fitted directly to obtain a non-uniform pressure function with the bulging time as a variable.
In another mode, since the bulging time and the nonuniform pressure are measured based on the bulging height as the characteristic quantity, the bulging height and the nonuniform pressure can be fitted first to obtain a nonuniform pressure function taking the bulging height as a variable; fitting the bulging height and the bulging time to obtain a functional relation between the bulging height and the bulging time; and finally, converting the non-uniform pressure function taking the bulging height as a variable into the non-uniform pressure function taking the bulging time as a variable according to the functional relation. Thus, the obtained non-uniform pressure function taking the bulging time as a variable can be more accurate.
The non-uniform pressure function is then adjusted a plurality of times for step 104 such that each adjusted pressure function gradually tends to a uniform pressure function.
In one embodiment of the invention, the non-uniform pressure function may be adjusted by the following means (S1-S3):
s1, determining pressure values corresponding to all nodes in each bulging time according to the non-uniform pressure function, and calculating average pressure values of the plates in each bulging time according to the pressure values corresponding to all nodes in each bulging time.
For example, for a certain bulging time, such as 2s, the bulging time may be input into the non-uniform pressure function, so that a pressure value corresponding to each node may be calculated. Such as the pressure values at nodes with node radii of 5, 15, 25mm, the average of these pressure values is calculated and the average pressure value is determined as the average pressure value of the sheet over the bulging time.
S2, according to the pressure value corresponding to each node on each bulging time and the average pressure value of the plate on each bulging time, determining the adjustment pressure value corresponding to each node on each bulging time after each adjustment; when one node with the same bulging time is adjusted for different times, after the middle time of adjustment, the adjusting pressure value of the node is positioned between the adjusting pressure value after the last adjustment and the average pressure value; after the last adjustment, the adjustment pressure value of the node is the average pressure value.
Continuing with the example, when the bulging time is calculated for 2s, for example, using a non-uniform pressure function, the pressure value on the node with the node radius of 5mm is 10MPa, the pressure value on the node with the node radius of 15mm is 8.6MPa, the pressure value on the node with the node radius of 25mm is 6.6MPa, and the average pressure values are all 8MPa. Then after the first adjustment, the adjustment pressure value on the node with the node radius of 5mm is in the range of [8,10 ], such as 9MPa; the range of the adjusting pressure value on the node with the node radius of 15mm is [8,8.6 ], such as 8.3MPa; the range of the adjusting pressure value on the node with the node radius of 25mm is (6.6,8), such as 7.2MPa, and the range of the adjusting pressure value on the node with the node radius of 5mm is [8,9 ], such as 8.5MPa; the range of the adjusting pressure value on the node with the node radius of 15mm is [8,8.3 ], such as 8.1MPa; the pressure values at the nodes with the radius of 25mm are in the range (7.2,8), such as 7.4MPa, … …, and the pressure values at the nodes are equal to the average pressure value at the time of 2s after the last adjustment.
Preferably, before step S2, the quotient of the difference between the pressure value of the node and the average pressure value over the bulging time divided by the number of adjustments may be determined as the adjustment gradient of the node over the bulging time for each bulging time. For example, the number of times of adjustment is 2, when the bulging time is 2s, the adjustment gradient of a node with a node radius of 5mm is 1MPa, the adjustment gradient of a node with a node radius of 15mm is 0.3MPa, the adjustment gradient of a node with a node radius of 25mm is 0.7MPa, the adjustment pressure value of the node with a node radius of 5mm after the first adjustment is 9MPa, the adjustment pressure value of the node with a node radius of 15mm is 8.3MPa, and the adjustment pressure value of the node with a node radius of 25mm is 7.3MPa; and after the second adjustment, the adjustment pressure values on all the nodes are 8MPa. Therefore, the pressure function after each adjustment has more uniform variation trend, and the obtained processing analysis result is more accurate.
S3, generating a pressure function after each adjustment by utilizing the adjustment pressure values respectively corresponding to the nodes on each bulging time after each adjustment.
Next, regarding step 106", the non-uniform pressure function and the pressure function after each adjustment are respectively used as additional load conditions, and each additional load condition is utilized to respectively perform finite element simulation on the plate deformation process, and step 108", based on each simulation result, respectively determine the stress path and the strain path of each node on the plate under the corresponding additional load condition.
In this embodiment, finite element simulation simulations may be implemented using ABAQUS software. The simulation can be carried out by selecting an axisymmetric model, inputting a non-uniform pressure function and the pressure function after each adjustment into a DLOAD subroutine, and respectively carrying out finite element simulation on the plate deformation process as an externally applied load condition of the plate deformation.
Based on the simulation result of the finite element simulation, the stress path and the strain path of each node can be extracted. For example, 3 nodes with the node radius of 5, 15 and 25mm are selected, and the stress path and the strain path of each node are extracted.
Assuming that the adjustment times of the non-uniform pressure are 2 times, a non-uniform pressure function after primary adjustment, a uniform pressure function after secondary adjustment and a non-uniform pressure function before adjustment can be obtained, and if each pressure function is simulated once, a stress path and a strain path corresponding to each pressure function can be obtained for a node with a node radius of 5mm.
It should be noted that, extracting stress paths and strain paths of each node based on simulation results of finite element simulation is common knowledge of those skilled in the art, and is not described herein in detail.
Finally, for step 110, a plurality of stress paths and strain paths are analyzed to determine the rule of influence of the non-uniform pressure on the deformation of the plate.
In order to analyze the rule of influence of non-uniform pressure on deformation of the sheet material, longitudinal analysis and/or transverse analysis is required for each node.
In an embodiment of the longitudinal analysis, it may comprise: and determining the change rule of the strain path of each node when the node corresponds to different stress paths respectively.
In this embodiment, the purpose of the longitudinal analysis is to compare each stress path of the node for the node at the same position and compare each strain path, so as to determine the strain change caused by the stress change, thereby determining the influence rule of the deformation of the plate under different stresses, and further providing theoretical support for the pressure change of each node for the control of the deformation process of the subsequent plate under different configurations.
In an embodiment of the lateral analysis, it may comprise: and respectively determining the change rule of the strain path of the nodes with different node radiuses on the plate under the applied load condition under the corresponding stress path according to each applied load condition.
In this embodiment, the purpose of the transverse analysis is to compare stress paths corresponding to nodes with different node radii, and compare strain paths corresponding to nodes with different node radii, and determine the rule of influence of deformation of the plate under different stresses by corresponding strain changes under different stress changes, so as to provide theoretical support for pressure changes of each node for control of deformation process of the subsequent plate under different configurations.
Further, when longitudinal analysis and/or transverse analysis are performed, stress paths and strain paths of nodes with large difference of strain results can be analyzed in a focused mode, and therefore mechanical mechanisms of non-uniform pressure for improving sheet forming performance are studied.
In this embodiment, according to the data processing result, it can be found that, in the process of pressure bulging of the viscous medium of the sheet material, the node which is further from the bulging center is larger in the main stress ratio, which indicates that the ratio of the main strain increment is also larger, the bending angle of the configuration can be judged to be larger according to the geometric equation, so that not only can the change rule of the strain be obtained, but also the deformation to the same bulging height under a smaller total load by using the pressure forming of the viscous medium can be indicated.
Further, after the influence rule of the non-uniform pressure on the deformation of the plate is determined, the influence rule of the non-uniform pressure on the deformation of the plate can provide technical support for the deformation behavior of non-uniform pressure forming, advance technical means are provided for improving the formability of the plate, and then the deformation processes of different configurations of the plate can be controlled according to the influence rule of the non-uniform pressure on the deformation of the plate. When the configuration changes, determining a strain path capable of realizing each node of the configuration, determining a stress path corresponding to each node according to the strain change path, determining a corresponding non-uniform pressure function according to the stress path of each node, and controlling the plate deformation process according to the non-uniform pressure function.
As shown in fig. 3 and 4, the embodiment of the invention provides a device for processing measurement data in a plate deformation process. The apparatus embodiments may be implemented by software, or may be implemented by hardware or a combination of hardware and software. In terms of hardware, as shown in fig. 3, a hardware architecture diagram of an electronic device where a processing device for measuring data in a board deformation process provided in an embodiment of the present invention is shown, where the electronic device where the embodiment is located may include other hardware, such as a forwarding chip responsible for processing a message, besides a processor, a memory, a network interface, and a nonvolatile memory shown in fig. 3. For example, as shown in fig. 4, the device in a logic sense is formed by reading a corresponding computer program in a nonvolatile memory into a memory by a CPU of an electronic device where the device is located. The embodiment provides a processing apparatus for measuring data in a plate deformation process, including:
a data acquisition unit 401 for acquiring measurement data corresponding when bulging a sheet material to each of a plurality of preset bulging heights; the measurement data at least comprise bulging time and non-uniform pressure to which the sheet material is subjected;
a function determining unit 402 for generating a non-uniform pressure function with bulging time as a variable from the measurement data; and adjusting the non-uniform pressure function a plurality of times so that the pressure function after each adjustment gradually tends to the uniform pressure function;
the simulation unit 403 is configured to respectively use the non-uniform pressure function and the pressure function after each adjustment as an additional load condition, and respectively perform finite element simulation on the plate deformation process by using each additional load condition;
the data determining unit 404 is configured to determine a stress path and a strain path of each node on the board under the corresponding externally applied load condition based on each simulation result;
and the analysis unit 405 is used for analyzing the stress paths and the strain paths and determining the rule of influence of the non-uniform pressure on the deformation of the plate.
In one embodiment of the present invention, the data obtaining unit 401 is specifically configured to receive input measurement data corresponding to each bulging height; the measurement data are obtained by respectively measuring each bulging height of the sheet bulging to a plurality of preset bulging heights;
for each of a plurality of preset bulging heights, the method for measuring the measurement data corresponding to the bulging height when the plate is bulged to the bulging height comprises the following steps:
before the plate bulging, the pressure sensitive films are arranged on the stress side of the plate in a set distribution mode;
and after the plate is swelled to the swelling height, recording the swelling time, taking down the set pressure sensitive film, and collecting the pressure value of the pressure sensitive film to obtain the non-uniform pressure born by the plate.
In one embodiment of the present invention, the function determining unit 402 specifically includes, when performing the multiple adjustments to the non-uniform pressure function:
according to the non-uniform pressure function, determining pressure values corresponding to all nodes in each bulging time, and calculating an average pressure value of the plate in each bulging time according to the pressure values corresponding to all nodes in each bulging time;
according to the pressure value corresponding to each node on each bulging time and the average pressure value of the plate on each bulging time, determining the adjusting pressure value corresponding to each node on each bulging time after each adjustment; when one node with the same bulging time is adjusted for different times, after the middle time of adjustment, the adjusting pressure value of the node is positioned between the adjusting pressure value after the last adjustment and the average pressure value; after the last adjustment, the adjustment pressure value of the node is an average pressure value;
and generating a pressure function after each adjustment by utilizing the adjustment pressure values respectively corresponding to the nodes on each bulging time after each adjustment.
In one embodiment of the present invention, the function determining unit 402 is further configured to determine, for each bulging time, a quotient of a difference between a pressure value of a node and an average pressure value at the bulging time divided by an adjustment number, as an adjustment gradient of the node at the bulging time; and executing the determination of the adjustment pressure values corresponding to the nodes on each bulging time after each adjustment according to the corresponding adjustment gradient.
In one embodiment of the present invention, the analysis unit 405 is specifically configured to perform a longitudinal analysis on each node, so as to determine, for each node, a change rule of a strain path of the node when the node corresponds to different stress paths.
In one embodiment of the present invention, the analysis unit 405 is specifically configured to perform a lateral analysis on each node, so as to determine, for each additional load condition, a change rule of a strain path of a node with a radius of a different node on the board under the additional load condition under a corresponding stress path.
It will be appreciated that the structure illustrated in the embodiments of the present invention does not constitute a specific limitation on a device for processing measurement data during deformation of a sheet material. In other embodiments of the invention, a processing device for measuring data during deformation of a sheet may include more or less components than shown, or may combine certain components, or may split certain components, or may have a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
The content of information interaction and execution process between the modules in the device is based on the same conception as the embodiment of the method of the present invention, and specific content can be referred to the description in the embodiment of the method of the present invention, which is not repeated here.
The embodiment of the invention also provides electronic equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method for processing the measured data in the plate deformation process in any embodiment of the invention is realized.
The embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor is caused to execute a method for processing measured data in the plate deformation process in any embodiment of the invention.
Specifically, a system or apparatus provided with a storage medium on which a software program code realizing the functions of any of the above embodiments is stored, and a computer (or CPU or MPU) of the system or apparatus may be caused to read out and execute the program code stored in the storage medium.
In this case, the program code itself read from the storage medium may realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code form part of the present invention.
Examples of the storage medium for providing the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer by a communication network.
Further, it should be apparent that the functions of any of the above-described embodiments may be implemented not only by executing the program code read out by the computer, but also by causing an operating system or the like operating on the computer to perform part or all of the actual operations based on the instructions of the program code.
Further, it is understood that the program code read out by the storage medium is written into a memory provided in an expansion board inserted into a computer or into a memory provided in an expansion module connected to the computer, and then a CPU or the like mounted on the expansion board or the expansion module is caused to perform part and all of actual operations based on instructions of the program code, thereby realizing the functions of any of the above embodiments.
It is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of additional identical elements in a process, method, article or apparatus that comprises the element.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: various media in which program code may be stored, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The processing method of the measured data in the plate deformation process is characterized by comprising the following steps of:
acquiring corresponding measurement data when the plate is expanded to each of a plurality of preset expansion heights; the measurement data at least comprise bulging time and non-uniform pressure to which the sheet material is subjected;
generating a non-uniform pressure function taking bulging time as a variable according to the measurement data;
adjusting the non-uniform pressure function for a plurality of times, so that the pressure function after each adjustment gradually tends to be the uniform pressure function;
taking the non-uniform pressure function and the pressure function after each adjustment as external load conditions respectively, and carrying out finite element simulation on the plate deformation process by utilizing each external load condition respectively;
based on each simulation result, respectively determining a stress path and a strain path of each node on the plate under the corresponding externally applied load condition;
and analyzing the stress paths and the strain paths to determine the rule of influence of the non-uniform pressure on the deformation of the plate.
2. The method of claim 1, wherein the acquiring the corresponding measurement data when bulging the sheet material to each of the plurality of preset bulging heights comprises: receiving input measurement data corresponding to each bulging height; the measurement data are obtained by respectively measuring each bulging height of the sheet bulging to a plurality of preset bulging heights;
for each of a plurality of preset bulging heights, the method for measuring the measurement data corresponding to the bulging height when the plate is bulged to the bulging height comprises the following steps:
before the plate bulging, the pressure sensitive films are arranged on the stress side of the plate in a set distribution mode;
and after the plate is swelled to the swelling height, recording the swelling time, taking down the set pressure sensitive film, and collecting the pressure value of the pressure sensitive film to obtain the non-uniform pressure born by the plate.
3. The method of claim 1, wherein said adjusting the non-uniform pressure function a plurality of times such that each adjusted pressure function gradually tends to a uniform pressure function comprises:
according to the non-uniform pressure function, determining pressure values corresponding to all nodes in each bulging time, and calculating an average pressure value of the plate in each bulging time according to the pressure values corresponding to all nodes in each bulging time;
according to the pressure value corresponding to each node on each bulging time and the average pressure value of the plate on each bulging time, determining the adjusting pressure value corresponding to each node on each bulging time after each adjustment; when one node with the same bulging time is adjusted for different times, after the middle time of adjustment, the adjusting pressure value of the node is positioned between the adjusting pressure value after the last adjustment and the average pressure value; after the last adjustment, the adjustment pressure value of the node is an average pressure value;
and generating a pressure function after each adjustment by utilizing the adjustment pressure values respectively corresponding to the nodes on each bulging time after each adjustment.
4. The method of claim 3, further comprising, prior to said determining the respective adjusted pressure value for each node at each bulging time after each adjustment:
for each bulging time, dividing the difference between the pressure value of the node at the bulging time and the average pressure value by the quotient of the adjustment times to determine the adjustment gradient of the node at the bulging time; and executing the determination of the adjustment pressure values corresponding to the nodes on each bulging time after each adjustment according to the corresponding adjustment gradient.
5. The method of claim 1, wherein analyzing the plurality of stress paths and strain paths to determine a rule of influence of non-uniform pressure on deformation of the sheet material comprises:
and carrying out longitudinal analysis on each node to respectively determine the change rule of the strain path of each node when the node corresponds to different stress paths.
6. The method of claim 1 or 5, wherein analyzing the plurality of stress paths and strain paths to determine the law of influence of non-uniform pressure on sheet deformation comprises:
and carrying out transverse analysis on each node so as to respectively determine the change rule of the strain path of the node with different node radiuses on the plate under the additional load condition under the corresponding stress path according to each additional load condition.
7. The method according to claim 1, further comprising, after said determining the law of influence of the non-uniform pressure on the deformation of the sheet material: and controlling the deformation process of different configurations of the plate according to the influence rule of the non-uniform pressure on the deformation of the plate.
8. A processing device for measuring data in a plate deformation process, comprising:
a data acquisition unit for acquiring corresponding measurement data when the plate is expanded to each of a plurality of preset expansion heights; the measurement data at least comprise bulging time and non-uniform pressure to which the sheet material is subjected;
a function determining unit for generating a non-uniform pressure function with bulging time as a variable according to the measurement data; and adjusting the non-uniform pressure function a plurality of times so that the pressure function after each adjustment gradually tends to the uniform pressure function;
the simulation unit is used for taking the non-uniform pressure function and the pressure function after each adjustment as external load conditions respectively, and carrying out finite element simulation on the plate deformation process by utilizing each external load condition respectively;
the data determining unit is used for respectively determining stress paths and strain paths of all nodes on the plate under the corresponding externally applied load condition based on each simulation result;
and the analysis unit is used for analyzing the stress paths and the strain paths and determining the rule of influence of the non-uniform pressure on the deformation of the plate.
9. An electronic device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the method of any of claims 1-7 when the computer program is executed.
10. A computer readable storage medium having stored thereon a computer program which, when executed in a computer, causes the computer to perform the method of any of claims 1-7.
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| JP2004042098A (en) * | 2002-07-12 | 2004-02-12 | Toyota Central Res & Dev Lab Inc | Forming simulation analysis method |
| CN112917988A (en) * | 2021-02-10 | 2021-06-08 | 哈尔滨工业大学 | Non-uniform pressure control method for composite viscous medium |
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