Unlock instant, AI-driven research and patent intelligence for your innovation.

Material tensile property testing method and device for small-size sample

A technology of tensile properties and testing methods, which is applied in the directions of measuring devices, analyzing materials, and using stable tension/pressure to test the strength of materials, etc., which can solve problems such as sample size limitations, and achieve the effect of easy operation and improved utilization

Active Publication Date: 2021-03-12
SOUTHWESTERN INST OF PHYSICS
View PDF32 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above technical problems, the present invention provides a material tensile property test method and device for a small-sized sample that solves the above problems, solves the sample size limitation problem of the traditional tensile property test method, has reliable basic theoretical support, and does not Relying on empirical formulas, the test is easy to operate, and the continuous and complete uniaxial stress-strain relationship, yield strength and tensile strength of the material can be accurately obtained using small-sized samples

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Material tensile property testing method and device for small-size sample
  • Material tensile property testing method and device for small-size sample
  • Material tensile property testing method and device for small-size sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a test method for obtaining the uniaxial stress-strain relationship and strength of a metal material with a small-sized sample. The specific test method is as follows:

[0051] Step 1. According to the test requirements, the metal material is processed into a plate sample or a round bar sample of a specific size, and the sample is manually polished with sandpaper of more than 800 mesh; figure 1 As shown, two sample configuration sizes are provided for optional use, including the non-equal measurement section of the sample and the clamping section of the fixture. figure 2 The finite element analysis model diagram of the non-straight measurement section of the small-size plate sample is given. After completing the preliminary machining of the sample, after many experiments and attempts, it is considered that it is more appropriate to use sandpaper of more than 800 mesh to finely polish the surface of the sample by hand.

[0052] Step 2, install ...

Embodiment 2

[0074] This embodiment provides a test device for obtaining the uniaxial stress-strain relationship and strength of a metal material for a small-sized sample, which is used in the test for obtaining the uniaxial stress-strain relationship and strength of a metal material for a small-sized sample provided in Example 1. method. Two sets of mirror-symmetrical fixtures, each set of fixtures include a base plate 1 and a cover plate 2; one end of the base plate 1 in the direction of the long axis is provided with a mounting groove, and the mounting groove is used to place the end of the small-sized sample to be clamped; the cover plate 2 is detachable Covered above the installation groove, the end of the small-sized sample to be clamped is clamped between the installation groove and the cover plate 2. For the detachable installation structure, threaded connection can be used. A through hole is opened on the cover plate 2, and one end of the bottom plate 1 The upper surface (located ...

Embodiment 3

[0077] The present embodiment adopts the method that embodiment 1 provides and the test fixture that embodiment 2 provides to test, and test method is summarized as follows:

[0078] Take small-sized plate samples and round rod samples as examples. like figure 1 As shown, the sample is divided into non-equal measuring section and clamping section. like figure 2 As shown in Fig. 1, the finite element simulation model of the non-equal measuring section of two samples is established, one end is fixed hinged, and the other end is subjected to axial tensile loading. Using the Hollomon constitutive model (such as image 3shown) as the constitutive relationship of the simulated material, the model includes the elastic modulus E, the strain hardening exponent n and the strain hardening coefficient K, changing these three parameters can be calculated in various working conditions, and the load-displacement curves of different imaginary materials can be obtained, Complete the calib...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a material tensile property test method of a small-size sample. The method comprises the following steps: obtaining a stable load-displacement curve of two clamp ends through auniaxial tensile loading test of the small-size sample under displacement control; building finite element simulation models of the non-equistraight measurement sections of the two samples; extracting a test curve, and predicting a uniaxial true stress-strain relationship conforming to the Hollomon constitutive model according to a load displacement relationship of a non-equistraight measurementsection of the sample; meanwhile, obtaining the elasticity modulus E and the tensile strength Rm of the material; and converting according to the obtained uniaxial true stress-strain relationship to obtain an engineering stress-strain curve so as to obtain the yield strength Rp0.2. The method solves the problem of sample size limitation of a traditional tensile property test method, has reliable basic theoretical support, does not depend on an empirical formula, is simple and convenient in test operation, and can accurately obtain the continuous and complete uniaxial stress-strain relationship, yield strength and tensile strength of the material by using a small-size sample.

Description

technical field [0001] The invention relates to the technical field of mechanical property testing, in particular to a method and device for testing the tensile properties of materials of small-sized samples. Background technique [0002] Nuclear fusion energy is considered as a new sustainable energy because it is safe, clean, non-polluting, and nuclear fusion fuel is inexhaustible. Before building a fusion reactor, it is necessary to conduct neutron irradiation tests on the structural candidate materials, test the mechanical properties of the materials after irradiation, and screen the structural materials for their radiation resistance performance to determine whether the materials meet the requirements for use in the reactor. However, due to the small irradiation space, for example, the volume of IFMIF high-throughput is only 0.5L, and various samples such as tension, impact, fatigue, and fracture toughness need to be placed in a limited volume. Using traditional tensil...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0075G01N2203/0073G01N2203/0216G01N2203/0218G01N2203/0252G01N2203/0286G01N2203/0298
Inventor 张志杰郑鹏飞谌继明
Owner SOUTHWESTERN INST OF PHYSICS