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Quasi-in-situ experimental method for dynamic shear deformation and failure behavior of metallic material

A technology of shear deformation and experimental method, applied in the direction of analyzing materials, using stable shear force to test material strength, measuring devices, etc., can solve the problem that the shape characteristics of round cap samples cannot be satisfied, and cannot be carried out load again

Inactive Publication Date: 2018-07-06
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using a round cap sample for research, if you want to observe the change process of the structure after a loading, you need to cut the sample along the axis direction and then make a metallographic sample. However, the cut sample has no longer the previous shape. , can not be reloaded, that is, the shape characteristics of the round cap sample cannot meet the requirements of "multiple loading and repeated observation" for the sample proposed by in situ tissue observation

Method used

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  • Quasi-in-situ experimental method for dynamic shear deformation and failure behavior of metallic material

Examples

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Embodiment 1

[0026] A quasi-in-situ experimental method for dynamic shear deformation and failure behavior of pure titanium materials, comprising the following steps:

[0027] (1) Prepare the pure titanium material into a square hat-shaped metal sample, the sample thickness z is 3mm, the sample width ω=8mm, the sample height h=9mm; the width of the top convex part ω 1 = 3mm, the height is h 1 =3mm; the width of the bottom concave part ω 3 = 5mm, height h 3 = 3mm; the sample contains two symmetrical shear zones 1, the width τ of the shear zone 1 is 1mm, and the height of the shear zone is h 2 = 3mm; the polished shape is a hat-shaped side, and the shear area on the side is marked, and the scanning electron microscope imaging analysis and electron backscatter diffraction analysis methods are used to observe the tissue morphology and the marked area on the side of the sample before deformation. grain orientation;

[0028] (2) to the sample that step (1) makes in The strain rate is 20000...

Embodiment 2

[0031] A quasi-in-situ experimental method for dynamic shear deformation and failure behavior of aluminum alloy materials, comprising the following steps:

[0032] (1) Prepare the aluminum alloy material into a square hat-shaped metal sample, the overall width of the sample is ω=8mm, the height h=12mm, and the thickness z is 4mm; the width of the raised part of the top of the square hat-shaped sample is ω 1 = 3mm, height h1 =4mm; the width of the bottom concave part ω 3 = 4.5mm, h 3 =4mm; the sample contains two symmetrical shear zones 1, the width τ of the shear zone 1 is 0.75mm, and the height of the shear zone 1 is h 2 = 4mm; the polished shape is a cap-shaped side, mark the shear area on the side, and use scanning electron microscope imaging analysis and electron backscattering diffraction analysis methods to observe the tissue morphology and shape of the marked area on the side of the sample before deformation. grain orientation;

[0033] (2) to the sample that step (1...

Embodiment 3

[0036] A quasi-in-situ experimental method for dynamic shear deformation and failure behavior of pure copper materials, comprising the following steps:

[0037] (1) Prepare pure copper material into a square hat-shaped metal sample, the overall width of the sample is ω=8mm, the height h=9mm, and the thickness z is 3mm; the width of the raised part of the top of the square hat-shaped sample is ω 1 = 4mm, height h 1 =3mm; the width of the bottom concave part ω 3 = 5mm, height h 3 =3mm; the sample contains two symmetrical shear zones 1, the width τ of the shear zone 1 is 0.5mm, and the height of the shear zone is h 2 = 3mm; the polished shape is a hat-shaped side, and the shear area on the side is marked, and the scanning electron microscope imaging analysis and electron backscatter diffraction analysis methods are used to observe the tissue morphology and the marked area on the side of the sample before deformation. grain orientation;

[0038] (2) to the sample that step (1)...

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Abstract

The invention belongs to a quasi-in-situ experimental method for dynamic shear deformation and failure behaviors of a metal material in the technical field of material dynamic mechanical experiments.The specific steps of the experimental method are as follows: (1) preparing a mortarboard type sample and polishing the side surface, and observing the microstructure and morphology and the grain orientation of the sample before deformation; (2) performing dynamic shear loading on the sample; (3) performing quasi-in-situ observation on the microstructure and morphology and the grain orientation ofthe sample after the loading; (4) performing dynamic loading again on the sample at a same strain rate to increase the total strain; and (5) repeating step (3) to step (4) until the sample is destroyed; the microstructure morphology and the grain orientation information observed by the method are further analyzed for reduction of change of the microstructure during dynamic shear deformation and failure process. By using the disclosed research and analysis method of the present invention, the dynamic shear deformation and failure behaviors of the metal material at a strain rate of 10<4>s<-1> to 10<5>s<-1> can be revealed.

Description

technical field [0001] The invention belongs to the technical field of material dynamic mechanics experiments, in particular to a quasi-in-situ experimental method for dynamic shear deformation and failure behavior of metal materials. Background technique [0002] The dynamic deformation and failure behavior of materials refers to the mechanical behavior of materials under high strain rate (higher than 5 / s), involving many civil and military fields such as explosive forming, impact synthesis, high-speed penetration and impact protection. There is a clear difference between the dynamic and quasi-static mechanical behavior of materials: under quasi-static conditions, the strain rate at which the material deforms is low, and each unit inside the material can be considered to be in stress equilibrium and thermal equilibrium at any point in time Under dynamic conditions, the strain rate of deformation is high, and at this time, the interior of the material deviates from the state...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0075
Inventor 骆雨萌叶文君惠松骁于洋宋晓云刘睿张文婧王翘楚
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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