Method for predicting fatigue strength of metal material by hardening strength and tensile strength

A technology of tensile strength and hardening strength, applied in the analysis of materials, strength characteristics, and the use of stable tension/pressure to test the strength of materials, etc. The effect of time, less time

Active Publication Date: 2018-10-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The conventional fatigue limit is tested by lifting method, step method or group method, which requires a lot of time and samples, and consumes a lot of manpower and financial resources

Method used

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  • Method for predicting fatigue strength of metal material by hardening strength and tensile strength
  • Method for predicting fatigue strength of metal material by hardening strength and tensile strength
  • Method for predicting fatigue strength of metal material by hardening strength and tensile strength

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Embodiment 1

[0027] This embodiment is to carry out fatigue strength prediction to the 316L steel material of different tensile strength, test (experimental data) to 316L steel material of 4 kinds of different tensile strengths, and be used for predicting 3 kinds of 316L steel materials (verification) of remaining untested data).

[0028] Step 1: Conduct axial tensile experiments on tensile samples of 316L steel materials with different tensile strengths, and obtain engineering stress-strain curves and tensile strengths of 316L steel materials with different tensile strengths. figure 1 It is the relationship between engineering stress-strain curve, real stress-strain curve and hardening strength of 316L steel material.

[0029] The four kinds of 316L steel materials used have tensile strengths of 1363MPa, 1170MPa, 904MPa and 667MPa respectively.

[0030] Step 2: Transform the engineering stress-strain curves in step 1 into true stress-strain curves according to formulas (2)-(3), and calcu...

Embodiment 2

[0034] This embodiment is to predict the fatigue strength of TWIP steel materials with different tensile strengths.

[0035] Step 1: Carry out axial tensile experiments on TWIP steel tensile samples with different tensile strengths, obtain engineering stress-strain curves of TWIP steel materials with different tensile strengths and four kinds of TWIP steel materials used for tensile strength, tensile strength The strengths are 1600MPa, 1443MPa, 1200MPa and 952MPa respectively.

[0036] Step 2: Transform the engineering stress-strain curves in step 1 into true stress-strain curves according to formulas (2)-(3), and calculate the hardening strength. The hardening strengths of the four TWIP steel materials used are 237MPa, 409MPa, 827MPa and 1462MPa, respectively.

[0037] Step 3: Carry out high-cycle fatigue test to obtain fatigue strength. According to the formula (1), the hardening strength in step 2 and the tensile strength in step 1 are substituted and fitted to obtain the...

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Abstract

The invention discloses a method for predicting fatigue strength of a metal material by hardening strength and tensile strength, and belongs to the technical field of material science and engineeringapplication. Firstly, a true stress-strain curve is calculated according to an engineering stress-strain curve, work hardening ability parameter, namely the hardening strength can be obtained, and thehardening strength and the tensile strength are combined and fitted by two-parameter least square method to establish the relationship between the fatigue strength and the hardening strength and thetensile strength. The method effectively reduces the experimental amount required for fatigue strength prediction, greatly saves time, money and labor costs, has high accuracy, and can be widely applied to various metal materials with strong work hardening ability.

Description

technical field [0001] The invention relates to the technical field of material science and engineering application, in particular to a method for predicting the fatigue strength of metal materials through hardening strength and tensile strength. Background technique [0002] Metal fatigue is the most common failure form of components. According to statistics, more than 80% of the failures of mechanical parts belong to fatigue damage, and there is no obvious deformation before fatigue damage, so fatigue damage often causes major accidents. Therefore, the prediction of fatigue strength is very important. Industrial production is of great significance. [0003] Conventional fatigue limit is tested by lifting method, step method or group method, all of which require a lot of time and samples, and consume a lot of manpower and financial resources. The test of static mechanical properties (such as tensile) is simple, and its cost is much lower than the above-mentioned fatigue li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/00
CPCG01N3/00G01N3/08
Inventor 张孟枭庞建超张振军张哲峰李守新
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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