Method for predicating high-strength steel fatigue crack growth performance

A fatigue crack propagation, high-strength steel technology, applied in the direction of strength characteristics, using stable tension/pressure testing material strength, measuring devices, etc., can solve complex and time-consuming problems, save time and cost, save experimental time and cost, resolving effects of unclear physical meaning

Active Publication Date: 2019-03-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

[0007] Aiming at the complex and time-consuming testing process of the fatigue crack growth performance of metal materials in the prior art, the purpose of the present invention is to provide a method for predicting the fatigue crack growth performance of high-strength steel, wh...

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  • Method for predicating high-strength steel fatigue crack growth performance
  • Method for predicating high-strength steel fatigue crack growth performance
  • Method for predicating high-strength steel fatigue crack growth performance

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Experimental program
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Embodiment 1

[0061] In this embodiment, static mechanical properties are used to predict the fatigue crack growth performance of two kinds of AISI 4340 steels. The specific steps are as follows:

[0062] Step 1: Perform a tensile test to obtain the tensile strength σ of the material b ;

[0063] Step 2: Carry out the plane strain fracture toughness experiment to obtain the fracture toughness K IC ;

[0064] Step 3: Through the formula (1), the value range of ΔK is 10MPa√m-0.9K IC , to calculate the fatigue crack growth rate, the estimated value and the experimental value are shown in Figure (5), and the two coincide.

Embodiment 2

[0066] In this embodiment, static mechanical properties are used to predict the fatigue crack growth properties of two steels used in the nuclear industry. The specific steps are as follows:

[0067] Step 1: Perform a tensile test to obtain the tensile strength σ of the material b ;

[0068] Step 2: Carry out the plane strain fracture toughness experiment to obtain the fracture toughness K IC ;

[0069] Step 3: Through the formula (1), the value range of ΔK is 10MPa√m-0.9K IC , to calculate the fatigue crack growth rate, the estimated value and the experimental value are shown in Figure (6), and the two coincide.

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Abstract

The invention disclose a method for predicating high-strength steel fatigue crack growth performance, and belongs to the technical field of metal material fatigue crack growth. The method comprises the following three steps: testing the tensile strength deltab by tensile test, performing plane strain fracture toughness test to obtain the fracture toughness KIC of the material, and substituting thetwo sets of data into a high-strength steel fatigue crack growth formula, so as to obtain the fatigue crack growth performance of the material. According to the invention, the fatigue crack growth performance can be predicated by simply utilizing the static mechanical performance of the material, and therefore, not only is the defect that the physical significance of parameters in the fatigue crack growth Paris formula is indefinite solved, but also time and expenses for fatigue test are saved. Meanwhile, the method provides a reference standard for material selection of engineering components, and opens up a new thought for how to optimize the fatigue crack growth performance of the material.

Description

Technical field: [0001] The invention relates to the technical field of metal material fatigue crack growth, in particular to a method for predicting the fatigue crack growth performance of high-strength steel. Background technique: [0002] Mechanical equipment and components in industries such as aerospace, high-speed rail, and automobiles are subject to cyclical loads, which lead to fatigue damage. Fatigue damage often occurs suddenly, causing heavy casualties and property losses. Nearly 90% of metal materials and components fail and fracture under cyclic loads much lower than the tensile strength during service, but the theoretical research on fatigue damage is still lacking. It is particularly important in China [Suresh S.Fatigue of materials[M].Cambridge university press,1998.]. For large-scale engineering components, due to the defects and internal microcracks in the material manufacturing and processing processes, the cracks will experience a period of steady-state...

Claims

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Application Information

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IPC IPC(8): G01N3/08G06F17/50
CPCG01N3/08G01N2203/0017G01N2203/0066G01N2203/0073G06F30/20
Inventor 张鹏李鹤飞段启强张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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