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Method for estimating crack initiation dimension values

A size and crack technology, which is applied in the field of estimating the size of crack initiation, can solve problems such as unstable fracture, fatigue strength reduction, fatigue failure, etc.

Pending Publication Date: 2019-07-26
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Microscopic fractures occur at the initial stage of the crack, which does not affect the fatigue strength, and macroscopic cracks occur in the short crack stage and long crack stage, resulting in a decrease in fatigue strength
Fatigue failure due to unstable fracture

Method used

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  • Method for estimating crack initiation dimension values
  • Method for estimating crack initiation dimension values
  • Method for estimating crack initiation dimension values

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Embodiment Construction

[0109] The method for estimating the fatigue crack initiation size proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0110] The core idea of ​​the present invention is to provide a method for estimating the numerical value of crack initiation size, so as to improve the prediction model of fatigue crack initiation size, and the predicted crack initiation size model provides a basis for researching the fatigue life of products.

[0111] In order to realize the above idea, the present invention provides a method for estimating the numerical value of crack initiat...

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Abstract

The invention provides a method for estimating a crack initiation dimension value, which comprises the following steps: obtaining a formula of short crack fatigue life based on an elastic-plastic fracture mechanical method, and establishing a basic model of a fatigue crack initiation dimension; and improving the basic model of the fatigue crack initiation size according to a calculation method ofthe fatigue crack initiation life, the total fatigue life and the invalid crack size to obtain a prediction model of the fatigue crack initiation size.

Description

technical field [0001] The invention relates to the technical field of material mechanics, in particular to a method for estimating the numerical value of crack initiation size. Background technique [0002] Fatigue is a process of damage accumulation that has been extensively studied. Fatigue failure generally consists of three stages: crack initiation stage, crack propagation stage, and finally an unstable fracture stage. The process from crack initiation to fatigue failure is as follows: figure 1 shown. The lower boundary of the macroscopically short crack is determined as the crack initiation size. Microscopic fracture occurs at the initial stage of the crack, which does not affect the fatigue strength, and macroscopic cracks occur in the short crack stage and long crack stage, resulting in a decrease in fatigue strength. Finally, unstable fracture occurs leading to fatigue failure. The invention studies the relative formula of the short crack fatigue life based on ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G16C60/00G01N3/24G01N3/32
CPCG16C60/00G01N3/24G01N3/32G01N2203/0066G01N2203/0073G06F30/20G06F2119/04
Inventor 刘新田葛海燕王海杰
Owner SHANGHAI UNIV OF ENG SCI
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