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Method for determining fatigue life of mechanical part based on energy method

A technology for mechanical parts and fatigue life, applied in the field of mechanical parts detection, can solve the problem that the accuracy of the fatigue life prediction of mechanical parts is not high enough

Pending Publication Date: 2020-04-10
SHANGHAI UNIV OF ENG SCI
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Problems solved by technology

[0004] The present invention provides a method for determining the fatigue life of mechanical parts based on the energy method, and aims to solve the problem that the accuracy of fatigue life prediction of mechanical parts in the prior art is not high enough

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  • Method for determining fatigue life of mechanical part based on energy method
  • Method for determining fatigue life of mechanical part based on energy method
  • Method for determining fatigue life of mechanical part based on energy method

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Embodiment Construction

[0074] The present invention will be further described below in combination with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0075] A method for determining the fatigue life of mechanical parts based on the energy method, the steps are as follows:

[0076] (1) Establish the numerical model of fatigue toughness and fatigue life;

[0077] (1.1) First Amendment;

[0078] After correction, the numerical model of fatigue toughness and fatigue life of non-masing materials is as follows:

[0079]

[0080]

[0081] The numerical model of fati...

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Abstract

The invention relates to a method for determining the fatigue life of a mechanical part based on an energy method. The method comprises the steps: firstly determining the values of parameters affecting the fatigue life of the mechanical part, putting the values into a numerical model of fatigue toughness and fatigue life, and outputting the fatigue life of the mechanical part through the numericalmodel; wherein a numerical model of a non-Masing material is shown in the description, a numerical model of a Masing material is shown in the description, W'f is static toughness (MPa) under monotonic loading; sigma f is fracture fatigue strength (MPa) under monotonic loading; delta sigma is loading stress (MPa); gamma is a constant, n' is a cyclic strain hardening index, sigma'f is a fatigue strength coefficient (MPa), epsilon'f is a fatigue plasticity coefficient, Nf is a fatigue life (cycles), b'' is a fatigue strength index considering surface machining, c is a fatigue ductility index, and delta sigma 0 is a proportional stress limit increment (MPa). According to the method, the quantitative relation of stress, energy and service life is described, and the precision is high.

Description

technical field [0001] The invention belongs to the technical field of mechanical parts detection and relates to a method for determining the fatigue life of mechanical parts based on an energy method. Background technique [0002] In order to prevent the occurrence of catastrophic damage accidents, the fatigue life estimation of important parts and structures of mechanical equipment has been widely paid attention to. When designing components and their structures, if the predicted fatigue life differs greatly from the actual fatigue life, unnecessary property losses and personal casualties will often be caused. In the prior art, the method for predicting fatigue life is based on the relationship between energy and fatigue life, but it is difficult to accurately obtain energy during the fatigue process, which makes it difficult to ensure accurate prediction results of fatigue life. [0003] Therefore, it is of great significance to study a method for determining the fatigue...

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Application Information

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IPC IPC(8): G06F30/17G06F119/04G01M13/00
CPCG01M13/00Y02T90/00
Inventor 刘新田汪宇晗王海杰王孝兰
Owner SHANGHAI UNIV OF ENG SCI
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