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Method for determining fatigue damage degree of metal material based on specific gravity measurement

A metal material, fatigue damage technology, applied in specific gravity measurement, measurement device, analysis material, etc., can solve the problems of inability to apply metal material stretching, difficulty, and difficulty in area measurement.

Inactive Publication Date: 2016-03-23
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, this method studies the cantilever bending of metal materials, not the stretching of metal materials, and this method cannot be applied to the study of stretching of metal materials. The area change refers to the difference between the initial area and the actual bearing area; the measurement of the area is more difficult, which makes the experiment more difficult

Method used

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  • Method for determining fatigue damage degree of metal material based on specific gravity measurement
  • Method for determining fatigue damage degree of metal material based on specific gravity measurement
  • Method for determining fatigue damage degree of metal material based on specific gravity measurement

Examples

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Embodiment 1

[0120] Such as Figure 1-6 As shown, a method for determining the degree of fatigue damage of metal materials based on specific gravity measurement, this method is a method for testing (testing) material performance:

[0121] step 1:

[0122] Step 1.1: Process the metal material to be tested (specifically, 45# low-carbon steel, namely GB / T699-199945 steel) into 12 standard samples, and the standard samples are diameter φ 1 and a cylindrical sample of length L; N=12; φ 1 is 10mm, L is 100mm; here the diameter φ 1 A cylindrical specimen with a length of L means that the diameter of the middle section of the specimen is φ 1 , the length of the middle section is L;

[0123] Step 1.2: carrying out different degrees of load tests on N standard samples on a tensile testing machine; making the N samples produce tensile deformation;

[0124] Step 1.3:

[0125] The original sample that has not undergone loading and unloading experiments is processed into φ 2 × L 2 Standard cylin...

Embodiment 2

[0153] A method for determining the fatigue damage degree of metal materials based on specific gravity measurement, which is used to test the damage degree of a certain key component in practice (such as a spindle with a large force, etc.),

[0154] For metal materials that have experienced actual deformation after actual use [such as a certain part of a certain machine equipment, which has been used for many years, it is now disassembled, and its fatigue damage is measured and studied, so as to determine the fatigue damage of the rest of the same batch of machines To make an assessment and reference (reference) of the situation, or to test the fatigue resistance of the material of a certain key component by the manufacturer] The method for determining the degree of fatigue damage includes the following steps:

[0155] Step 1.1:

[0156] Raw metal material that has not been used and has not undergone tensile deformation is processed into φ 2 × L 2 Standard cylindrical sample...

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Abstract

The invention discloses a method for determining the fatigue damage degree of a metal material based on specific gravity measurement. The method includes the following steps that 1, the density rho of the metal material without damage and the density (with the symbol shown in the specification) of the metal material with damage are measured; 2, the fatigue damage value of the metal material is calculated according to the formula (shown in the specification), wherein D indicates the fatigue damage value of the metal material. The method for determining the fatigue damage degree of the metal material based on specific gravity measurement is high in reliability and easy to implement.

Description

technical field [0001] The invention relates to a method for determining the degree of fatigue damage of metal materials based on specific gravity measurement. Background technique [0002] The history of metal plastic damage research has only been more than half a century since the former Soviet scientist Kachanov proposed the "continuity factor" and "effective stress" in 1958. Although rapid development has been achieved in recent years, such as the elastic modulus test method, ultrasonic method, resistance test method and microhardness method of metal plastic damage, etc., and the application of damage mechanics to the design and construction of nuclear reactors, large deformation processing of metals, etc. Forming limits in and estimated service life of engineering components, etc. But there are also many literatures that question the existence of metal plastic damage. It can be seen that damage mechanics is still in a developing stage, the main reason is that damage m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/36
CPCG01N9/36G01N2009/022
Inventor 罗迎社司家勇肖敏杨世锋徐小舟侯朝国黄斌杰何瑾
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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