Material strain-hardness relation detection method

A detection method and hardness testing technology, applied in the direction of testing material hardness, analyzing materials, measuring devices, etc., can solve problems such as insufficient accuracy, and achieve the effect of accurate strain-hardness relationship

Active Publication Date: 2021-08-06
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the determination method based on finite element simulation is not accurate enough

Method used

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  • Material strain-hardness relation detection method
  • Material strain-hardness relation detection method
  • Material strain-hardness relation detection method

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Embodiment Construction

[0024] Such as figure 1 Shown in (a)~(c), it is a kind of sample to be tested that this embodiment relates to, and the measuring method of its strain-hardness relation specifically comprises:

[0025] The first step is to prepare the sample to be tested: use 20MnMoB as the material to prepare an incomplete cylinder with a diameter of 20mm and a height of 30mm. The central axis is 5 mm; four hemispherical pits are further arranged on the plane, and the four pits are symmetrically distributed around the center of the plane; the diameter of the hemispherical pits is 5 mm, and the length and width distances between the hemispherical pits are both 10 mm.

[0026] The second step, surface spraying treatment: spray paint on the side plane of the sample with spherical pits obtained in the first step, spray white paint first, and then spray black paint after the white paint is dry, to ensure the plane outside the spherical pits Uniform spraying to ensure complete and accurate capture ...

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Abstract

The invention relates to a material strain-hardness relation detection method, which comprises the following steps: carrying out paint spraying treatment on an axial side plane with a spherical pit of a semi-tubular sample by utilizing a to-be-detected sample capable of obtaining large strain, vertically placing the semi-tubular sample subjected to paint spraying at the centers of an upper die and a lower die, and performing extruding from top to bottom to generate compression deformation, acquiring strain in-situ measurement data by acquiring a deformation image during deformation; cutting the compressed and deformed semi-tubular sample, embedding the cut semi-tubular sample into phenolic resin for hardness testing, and correcting and fitting hardness data to obtain a strain-hardness relationship. The strain distribution of the sample is measured in real time by combining a digital image technology, the surface hardness distribution of the deformed sample is directly measured, and the strain-hardness relationship of the material is determined on the basis of the measured strain and hardness data.

Description

technical field [0001] The invention relates to a technology in the field of material detection, in particular to a method for detecting material strain-hardness relationship. Background technique [0002] For precision parts manufactured by large plastic deformation process, the hardness after forming is generally used as an important inspection index for its performance. The determination of the material strain-hardness relationship can predict the hardness of the deformed part, thereby guiding the design of the part and its plastic deformation process. At present, the determination method based on finite element simulation is not accurate enough. Contents of the invention [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a material strain-hardness relationship detection method, which utilizes a sample to be tested that can obtain a large strain, combines digital image technology to measure the strain distribution of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/40G01N3/02
CPCG01N3/40G01N3/02
Inventor 胡成亮卓悦胡誉曹民业刘红宇
Owner SHANGHAI JIAO TONG UNIV
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