CN117828939A - Strain gauge arrangement method - Google Patents

Strain gauge arrangement method Download PDF

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Publication number
CN117828939A
CN117828939A CN202311865047.XA CN202311865047A CN117828939A CN 117828939 A CN117828939 A CN 117828939A CN 202311865047 A CN202311865047 A CN 202311865047A CN 117828939 A CN117828939 A CN 117828939A
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tensile
strain
strain gauge
sample
grid
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Inventor
张伟
刘华赛
李春光
潘跃
韩龙帅
刘立现
邱木生
于孟
李学涛
韩赟
徐海卫
阳锋
邹英
桑贺
陈洪生
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Shougang Group Co Ltd
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Shougang Group Co Ltd
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Priority to CN202311865047.XA priority Critical patent/CN117828939A/en
Publication of CN117828939A publication Critical patent/CN117828939A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075—Strain-stress relations or elastic constants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/24—Sheet material
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

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  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The application relates to the technical field of sheet metal performance testing, in particular to a strain gauge arrangement method, which comprises the following steps: preparing a grid on the surface of one side of the tensile sample, and carrying out a conventional tensile test to obtain an actual movement end displacement curve; determining an arrangement alternative area of the strain gauge according to the deformation condition of the grid prefabricated on the surface of the tensile sample; constructing a finite element stretching model corresponding to the stretching sample according to the actual movement end displacement curve and the grid deformation condition; determining a strain gauge arrangement position of the tensile sample through the finite element stretching model and the arrangement candidate region; and arranging the strain gauge on the tensile sample according to the strain gauge arranging position. The technical scheme provided by the application can optimize the arrangement of the strain gauges to a certain extent, thereby improving the accuracy of the stress test result.

Description

Strain gauge arrangement method
Technical Field
The application relates to the technical field of sheet metal performance testing, in particular to a strain gauge arrangement method.
Background
When the high-speed tensile test is carried out, particularly when the strain rate is greater than 10/s, the instantaneous high-energy loading is carried out, and the sample is subjected to larger vibration impact, so that buckling deformation is easily caused. Meanwhile, extensometer, sensor and the like of a conventional universal tensile testing machine cannot meet the requirements of high-speed tensile testing precision and frequency, and in order to solve the problems, the most common method at present is to paste a strain gauge on an elastic deformation area of the surface of a high-speed tensile sample, and equivalently obtain the change of parallel section stress through the conversion of a voltage signal. It follows that the arrangement of the strain gage will directly affect the accuracy of the stress test results.
Disclosure of Invention
The embodiment of the application provides a strain gauge arrangement method, and further the strain gauge arrangement can be optimized at least to a certain extent, so that the accuracy of a stress test result is improved.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned in part by the practice of the application.
According to an aspect of an embodiment of the present application, there is provided a method for disposing a strain gauge, the method including: preparing a grid on the surface of one side of the tensile sample, and carrying out a conventional tensile test to obtain an actual movement end displacement curve; determining an arrangement alternative area of the strain gauge according to the deformation condition of the grid prefabricated on the surface of the tensile sample; constructing a finite element stretching model corresponding to the stretching sample according to the actual movement end displacement curve and the grid deformation condition; determining a strain gauge arrangement position of the tensile sample through the finite element stretching model and the arrangement candidate region; and arranging the strain gauge on the tensile sample according to the strain gauge arranging position.
In some embodiments of the present application, the preparing a grid on the surface of one side of the tensile specimen includes: and preparing a grid on the surface of one side of the tensile sample, and preparing the grid on the transition circular arc and the clamping end of the parallel section of the tensile sample, so as to ensure that the grid arrangement center is respectively parallel to the center line and the side line of the sample.
In some embodiments of the present application, the performing a conventional tensile test to obtain an actual motion end displacement curve includes: placing the tensile sample in a tensile testing machine to perform a conventional tensile test; and maintaining a constant loading speed in the conventional tensile test, and acquiring a displacement change curve of the moving end of the tensile sample.
In some embodiments of the present application, the determining the arrangement candidate area of the strain gauge according to the deformation condition of the grid prefabricated on the surface of the tensile sample includes: and testing the strain degree of the clamping end of the tensile sample according to the deformation condition of the grid prefabricated on the surface of the tensile sample by adopting a grid strain test analysis system, and determining an arrangement alternative area of the strain gauge according to the strain degree.
In some embodiments of the present application, the determining the arrangement candidate area of the strain gauge according to the strain degree includes: and taking the grid area with concentrated strain and the strain degree smaller than the preset strain degree as an arrangement alternative area of the strain gauge.
In some embodiments of the present application, the constructing a finite element tensile model corresponding to the tensile sample according to the actual motion end displacement curve and the grid deformation condition includes: and constructing a finite element stretching model corresponding to the stretching sample by adopting finite element analysis software according to the actual movement end displacement curve and the grid deformation condition.
In some embodiments of the present application, the determining the strain gauge placement location of the tensile specimen by the finite element stretch model and the placement candidate region includes: dividing the arrangement candidate area into areas according to the size of the strain gauge; and obtaining the maximum stress value of each equal division area, and determining the arrangement position of the strain gauge of the tensile sample according to each maximum stress value and the material strength of the tensile sample.
In some embodiments of the present application, the number of strain gages is at least 4, the disposing the strain gages on the tensile specimen includes: at least 4 strain gages are arranged on two sides of the tensile sample, and the strain gages are arranged along the length direction of the tensile sample or perpendicular to the length direction.
In some embodiments of the present application, after disposing the strain gauge on the tensile specimen, the method further comprises: tensile test verification was performed on the tensile test pieces that completed the arrangement.
Based on the scheme, the application has at least the following advantages or improvements:
in the technical scheme provided by some embodiments of the present application, a conventional tensile test is performed by preparing a grid on the surface of one side of a tensile sample, and an actual movement end displacement curve is obtained; determining an arrangement alternative area of the strain gauge according to the deformation condition of the grid prefabricated on the surface of the tensile sample; constructing a finite element stretching model corresponding to the stretching sample according to the actual movement end displacement curve and the grid deformation condition; determining a strain gauge arrangement position of the tensile sample through the finite element stretching model and the arrangement candidate region; according to the arrangement positions of the strain gages, the strain gages are arranged on the tensile test sample, and the arrangement positions of the strain gages can be accurately determined by combining finite element simulation and actual tensile tests, so that the accuracy of stress test results is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In the drawings:
FIG. 1 illustrates a flow chart of a method of disposing a strain gage according to one embodiment of the present application;
FIG. 2 illustrates a flow chart of a method of disposing a strain gage according to one embodiment of the present application;
FIG. 3 illustrates a flow chart of a method of disposing a strain gage according to one embodiment of the present application;
FIG. 4 shows a schematic diagram of a tensile specimen securing and loading scheme in accordance with one embodiment of the present application;
FIG. 5 shows a schematic diagram of a tensile specimen circular grid Shi Hua in accordance with one embodiment of the present application;
FIG. 6 illustrates a schematic diagram of stretch specimen elastic candidate zone partitioning in accordance with one embodiment of the present application;
FIG. 7 illustrates a schematic diagram of a tensile specimen strain gauge attachment location in accordance with one embodiment of the present application;
fig. 8 shows a schematic diagram of a tensile specimen strain gage wiring arrangement in accordance with an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that the aspects of the application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
The implementation details of the technical solutions of the embodiments of the present application are described in detail below:
please refer to fig. 1.
Fig. 1 shows a flowchart of a method of disposing strain gauges according to an embodiment of the present application, as shown in fig. 1, the method may include steps S101-S105:
and step S101, preparing a grid on the surface of one side of the tensile sample, and carrying out a conventional tensile test to obtain an actual movement end displacement curve.
And step S102, determining an arrangement alternative area of the strain gauge according to the deformation condition of the grid prefabricated on the surface of the tensile sample.
And step S103, constructing a finite element stretching model corresponding to the stretching sample according to the actual movement end displacement curve and the grid deformation condition.
Step S104, determining the strain gauge arrangement position of the tensile sample through the finite element tensile model and the arrangement candidate region.
And step S105, arranging the strain gauge on the tensile sample according to the strain gauge arrangement position.
In the application, the elastic deformation area of the sample surface can be accurately and rapidly obtained for adhering the strain gauge by using the sample surface strain grid test and stretching process reconstruction simulation analysis technology, and the strain gauge arrangement circuit and the verification method are provided.
In this application, the method for preparing a mesh on a surface of one side of a tensile sample may include: and preparing a grid on the surface of one side of the tensile sample, and preparing the grid on the transition circular arc and the clamping end of the parallel section of the tensile sample, so as to ensure that the grid arrangement center is respectively parallel to the center line and the side line of the sample.
Please refer to fig. 2.
Fig. 2 is a flowchart illustrating a method for disposing strain gauges according to an embodiment of the present application, and as shown in fig. 2, the method for performing a conventional tensile test and obtaining an actual motion end displacement curve may include steps S201 to S203:
step S201, placing the tensile sample in a tensile testing machine to conduct conventional tensile testing.
Step S202, maintaining a constant loading speed in the conventional tensile test, and acquiring a displacement change curve of the moving end of the tensile sample.
In the present application, the sample can be addedConventional tensile tests were performed on a universal tensile tester. Maintaining the loading speed v throughout stretching 0 Constant, where v0=0.1×l 0 ，l 0 In order to test the length of the parallel section of the sample, a displacement change curve of the moving end of the sample in the whole process is obtained.
In the application, the method for determining the arrangement candidate area of the strain gauge according to the deformation condition of the grid prefabricated on the surface of the tensile sample can comprise the following steps: and testing the strain degree of the clamping end of the tensile sample according to the deformation condition of the grid prefabricated on the surface of the tensile sample by adopting a grid strain test analysis system, and determining an arrangement alternative area of the strain gauge according to the strain degree.
In the present application, the method for determining the arrangement candidate region of the strain gauge according to the strain degree may include: and taking the grid area with concentrated strain and the strain degree smaller than the preset strain degree as an arrangement alternative area of the strain gauge.
In the application, the strain epsilon j of the tensile sample holding end can be tested according to the deformation condition of the circular grid prefabricated in advance on the surface of the tensile sample through a grid strain test analysis system, and the area with concentrated strain values and less than epsilon j less than or equal to 0.1% is used as an arrangement candidate area of the strain gauge.
In this application, the method for constructing the finite element tensile model corresponding to the tensile sample according to the actual motion end displacement curve and the grid deformation condition may include: and constructing a finite element stretching model corresponding to the stretching sample by adopting finite element analysis software according to the actual movement end displacement curve and the grid deformation condition.
In the application, a tensile sample analysis reconstruction model is built by adopting finite element analysis software, the clamping end is completely fixed, and the motion end applies v 0 And (3) obtaining a displacement curve of the moving end at a constant speed and comparing the displacement curve with an actual measurement result, wherein the maximum error is required to be ensured not to exceed 5%.
Please refer to fig. 3.
Fig. 3 shows a flowchart of a method for disposing strain gages according to an embodiment of the present application, and as shown in fig. 3, the method for determining a strain gage disposing position of a tensile sample by the finite element tensile model and the disposing candidate region may include steps S301 to S302:
and step S301, dividing the arrangement candidate area into areas according to the size of the strain gauge.
And step S302, obtaining the maximum stress value of each equal division area, and determining the arrangement position of the strain gauge of the tensile sample according to each maximum stress value and the material strength of the tensile sample.
In the application, n equally dividing the alternative regions can be carried out according to the size of the strain gauge, the value of n is generally 5-8, and the width of each alternative region is ensured to be not smaller than the length of the strain gauge; obtaining the maximum stress value sigma i, i=1, 2 … … n and n of each region as the equally divided number of the candidate regions, and obtaining eta i=1-sigma i/sigma 0 and sigma 0 as the yield strength of the material. Then analyzing the value of eta, if the value of eta is more than or equal to 0, indicating that the area is an elastic deformation area, and selecting the area with the minimum value of eta as the arrangement position of the strain gauge; if all eta <0, indicating that all areas are subjected to certain plastic deformation, wherein the deformation of the area where the minimum value of eta is located is more similar to the elastic deformation, selecting the area as the arrangement position of the strain gauge; if the eta values of a plurality of optional areas are equal, selecting the position close to the transition circular arcs of the parallel sections as the arrangement position of the strain gauge, wherein the test result of the area is closer to the actual value of the parallel sections.
In this application, the number of strain gages is at least 4, and the method of disposing the strain gages on the tensile specimen may include: at least 4 strain gages are arranged on two sides of the tensile sample, and the strain gages are arranged along the length direction of the tensile sample or perpendicular to the length direction.
In the present application, a sample two-sided arrangement and a full bridge circuit are employed; 1. the strain gauge No. 3 is arranged along the length direction of the sample, and the strain gauges No. 2 and No. 4 are arranged perpendicular to the length direction; the arrangement directions of the No. 1 and the No. 3, and the arrangement directions of the No. 2 and the No. 4 are opposite; the working measuring strain gauge is No. 1 and No. 2, the test value is DeltaU, the compensating strain gauge is No. 3 and No. 4, and the compensating value is Eg.
In the present application, after disposing the strain gauge on the tensile specimen, the method may further include: tensile test verification was performed on the tensile test pieces that completed the arrangement.
In this application, the sample with attached strain gauge can be held on a universal tensile tester, applying a constant v1 loading rate, where v1=0.001×l0; obtaining strain change of the parallel section, immediately stopping testing when the strain value reaches 1%, and removing the applied load; acquiring the change of the output voltage of the strain gauge in the whole process, if the voltage shows a straight line rising, and when the loading is stopped, the maximum value is reached, and then the strain gauge is restored to 0, so that the area where the strain gauge is positioned is an elastic change area, and the arrangement position of the strain gauge is accurate and effective; otherwise, repeating the steps 5-7, increasing the value of the dividing region n, and ensuring that the width of each alternative region is not smaller than the length of the strain gauge until the test result of the step 8 is met, thus obtaining the elastic change region.
In order that those skilled in the art will appreciate a more complete understanding of the present application, reference will be made to the following description of the embodiments.
The dynamic mechanical property test is required to be carried out on the automobile plate material, and the installation position of the strain gauge is required to be determined.
Step 1: in order to improve the accuracy of the test data, simulating the work hardening of the vehicle body, and performing bake hardening treatment on the material to be tested, wherein the condition is that the temperature is 175 ℃ and the temperature is kept for 20min;
step 2: referring to fig. 4, fig. 4 shows a schematic diagram of a tensile specimen securing and loading mode in accordance with one embodiment of the present application. According to the fixture requirements of the test equipment, the test sample is processed according to the requirements of the fixture of the test equipment, and in order to effectively control the influences of processing burrs and the like, water cutting is adopted for punching, and a laser cutting processing tensile sample is selected.
Step 3: referring to fig. 5, fig. 5 shows a schematic diagram of a tensile specimen circular grid Shi Hua in accordance with one embodiment of the present application. And preparing a circular grid in the area between the parallel transition circular arcs and the holding ends of one side surface of the tensile sample by adopting an electrochemical corrosion method, wherein the diameter of a single circular grid is 1.5mm, and the transverse and longitudinal connecting lines of the center of the grid are respectively parallel to the center line and the side line of the sample.
Step 4: placing the test sample of the drawn grid in a universal tensile testing machine to perform a quasi-static tensile test; the stretching speed v0 is kept constant in the whole process, v0=0.1xl0, and l0 is the length of a parallel section of the test sample; after the sample is broken, stopping loading, and taking down the residual sample at the holding end of the painting grid; meanwhile, a displacement change curve of the moving end of the sample in the whole process is obtained.
Step 5: and (3) testing the residual sample at the holding end of the drawn grid by using a grid strain test analysis system, and taking a region which has concentrated strain values and satisfies epsilon j less than or equal to 0.1% as an alternative region for strain gauge arrangement.
Step 6: according to the actual sample size, an analysis model of the sample stretching process is built by adopting finite element analysis software, the holding end is completely fixed, the moving end applies constant loading speed v0, a moving end displacement curve is obtained and is compared with an actual measurement result, and the error is analyzed by adopting a least square method, so that the maximum error is ensured not to exceed 5%.
Step 7: according to the size of the adopted strain gauge, n equally dividing the alternative regions, wherein the value of n is generally 5-8, ensuring that the width of each alternative region is not smaller than the length of the strain gauge, and obtaining a stress change curve of each region close to the center line of the sample.
Step 8: according to the stress curve of each measured region, the maximum stress value sigma i of each region is obtained, i=1, 2 … … n, n is the equally divided number of the candidate regions, and the value eta i is further obtained, wherein eta i=1-sigma i/sigma 0, and sigma 0 is the yield strength of the material.
Step 9: referring to fig. 6, fig. 6 is a schematic diagram illustrating the division of elastic candidate regions of a tensile sample according to an embodiment of the present application, analyzing a value of ηi, and if the value of ηi is greater than or equal to 0, indicating that the region is an elastic deformation region, selecting a region where a minimum value of ηi is located as an arrangement position of a strain gauge; if all eta <0, indicating that all areas are subjected to certain plastic deformation, wherein the deformation of the area where the minimum value of eta is located is more similar to the elastic deformation, selecting the area as the arrangement position of the strain gauge; if a plurality of selectable areas eta i are equal in value, selecting a position close to a transition arc of the parallel section as an arrangement position of the strain gauge, wherein the test result of the area is closer to the actual value of the parallel section;
step 10: 7-8, FIG. 7 is a schematic diagram showing the attachment position of a strain gauge of a tensile test specimen according to one embodiment of the present application, FIG. 8 is a schematic diagram showing the arrangement scheme of the strain gauge line of the tensile test specimen according to one embodiment of the present application, and the strain gauge is attached to the arrangement area obtained after the arrangement is preferred, so as to improve the accuracy of the test, and effectively control the instantaneous high-energy impact oscillation fluctuation, and adopt the way of arranging the two sides of the test specimen; meanwhile, strain gauges adopt a full-bridge circuit arrangement mode, strain gauges 1 and 3 are arranged along the length direction of a sample, and strain gauges 2 and 4 are arranged perpendicular to the length direction; the arrangement directions of the No. 1 and the No. 3, and the arrangement directions of the No. 2 and the No. 4 are opposite; the number 1 and the number 2 are working measuring strain gauges, the test value is delta U, the number 3 and the number 4 are compensating strain gauges, and the compensation value is Eg;
step 11: the method comprises the steps of (1) adding a sample adhered with a strain gauge to a universal tensile testing machine, applying v1 to be constant, wherein v1=0.001 x l0, obtaining strain change of a parallel section, immediately stopping testing when the strain value reaches 1%, and removing the applied load; acquiring the change of the output voltage of the strain gauge in the whole process, if the voltage shows a straight line rising, and when the loading is stopped, the maximum value is reached, and then the strain gauge is restored to 0, so that the area where the strain gauge is positioned is an elastic change area, and the arrangement position of the strain gauge is accurate and effective; otherwise, repeating the steps 5-7, increasing the value of the dividing region n, and ensuring that the width of each alternative region is not smaller than the length of the strain gauge until the test result of the step 8 is met, thus obtaining the elastic change region;
step 12: and (3) carrying out the same treatment on other samples of the same material according to the obtained strain gauge pasting position, and then adopting a high-speed tensile testing machine to carry out the next high-speed mechanical performance test.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (9)

1. A method of disposing a strain gage, the method comprising:
preparing a grid on the surface of one side of the tensile sample, and carrying out a conventional tensile test to obtain an actual movement end displacement curve;
determining an arrangement alternative area of the strain gauge according to the deformation condition of the grid prefabricated on the surface of the tensile sample;
constructing a finite element stretching model corresponding to the stretching sample according to the actual movement end displacement curve and the grid deformation condition;
determining a strain gauge arrangement position of the tensile sample through the finite element stretching model and the arrangement candidate region;
and arranging the strain gauge on the tensile sample according to the strain gauge arranging position.
2. The method of claim 1, wherein the preparing a grid on the surface of the tensile specimen side comprises:
and preparing a grid on the surface of one side of the tensile sample, and preparing the grid on the transition circular arc and the clamping end of the parallel section of the tensile sample, so as to ensure that the grid arrangement center is respectively parallel to the center line and the side line of the sample.
3. The method of claim 1, wherein performing a conventional tensile test to obtain an actual motion end displacement curve comprises:
placing the tensile sample in a tensile testing machine to perform a conventional tensile test;
and maintaining a constant loading speed in the conventional tensile test, and acquiring a displacement change curve of the moving end of the tensile sample.
4. The method of claim 1, wherein the determining the placement candidate area of the strain gauge according to the mesh deformation condition of the tensile specimen surface preparation comprises:
and testing the strain degree of the clamping end of the tensile sample according to the deformation condition of the grid prefabricated on the surface of the tensile sample by adopting a grid strain test analysis system, and determining an arrangement alternative area of the strain gauge according to the strain degree.
5. The method of claim 4, wherein said determining an arrangement candidate region of the strain gage based on the degree of strain comprises:
and taking the grid area with concentrated strain and the strain degree smaller than the preset strain degree as an arrangement alternative area of the strain gauge.
6. The method according to claim 1, wherein constructing the finite element stretch model corresponding to the tensile test sample according to the actual motion end displacement curve and the grid deformation condition comprises:
and constructing a finite element stretching model corresponding to the stretching sample by adopting finite element analysis software according to the actual movement end displacement curve and the grid deformation condition.
7. The method of claim 1, wherein said determining a strain gauge placement location of said tensile specimen by said finite element stretch model and said placement candidate region comprises:
dividing the arrangement candidate area into areas according to the size of the strain gauge;
and obtaining the maximum stress value of each equal division area, and determining the arrangement position of the strain gauge of the tensile sample according to each maximum stress value and the material strength of the tensile sample.
8. The method of claim 1, wherein the number of strain gages is at least 4, the disposing the strain gages on the tensile specimen comprising:
at least 4 strain gages are arranged on two sides of the tensile sample, and the strain gages are arranged along the length direction of the tensile sample or perpendicular to the length direction.
9. The method of claim 1, wherein after disposing the strain gauge on the tensile specimen, the method further comprises:
tensile test verification was performed on the tensile test pieces that completed the arrangement.
CN202311865047.XA 2023-12-29 2023-12-29 Strain gauge arrangement method Pending CN117828939A (en)

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