Method for predicting dual-scale creep fatigue life of discontinuous structure

A fatigue life prediction, discontinuous technology, applied in special data processing applications, geometric CAD, computer-aided design, etc., can solve problems such as stress-strain behavior and damage mechanism evolution that cannot be described at the microscopic level

Pending Publication Date: 2021-06-15
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such methods can only perform damage analysis at the macroscopic level, and cannot describe the stress-strain behavior and damage mechanism evolution at the microscopic level.

Method used

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  • Method for predicting dual-scale creep fatigue life of discontinuous structure
  • Method for predicting dual-scale creep fatigue life of discontinuous structure
  • Method for predicting dual-scale creep fatigue life of discontinuous structure

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Embodiment Construction

[0044] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0045] Such as figure 1 As shown, according to a kind of discontinuous structure double-scale creep fatigue life prediction method of the present invention, comprises the following steps:

[0046] Step S1, obtain the non-uniform constitutive model parameters corresponding to the material to be tested, and use Abaqus software to establish a discontinuous structure finite element model, and analyze the creep fatigue behavior of the discontinuous structure finite element model according to the obtained non-uniform constitutive model parameters The simulation is carried out to extract the displacement field of the discontinuous structure finite element model under different creep fatigue conditions. Among them, the steps of obtaining the parameters of the non-uniform constitutive model include:

[0047]Step S11, using Abaqus software to establish a m...

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Abstract

The invention relates to a method for predicting the dual-scale creep fatigue life of a discontinuous structure. The method comprises the following steps: extracting a displacement field of a finite element model of the discontinuous structure; obtaining crystal plasticity model parameters, and establishing a crystal plasticity finite element model at the dangerous position of the discontinuous structure; taking a displacement field of the finite element model of the discontinuous structure as a boundary condition of a crystal plasticity finite element model, and constructing a dual-scale finite element model of the discontinuous structure; acquiring a creep indication factor and a critical value thereof, and a fatigue indication factor and a critical value thereof; and predicting the creep fatigue life of the discontinuous structure. According to the method, the stress condition of the discontinuous structure on the macro scale can be reflected, the damage evolution of the discontinuous structure on the micro scale can be revealed, the dangerous position of creep fatigue crack initiation can be effectively obtained, and therefore the creep fatigue life of the discontinuous structure can be accurately predicted; and theoretical support is provided for premature failure prevention and life extension of the discontinuous structure.

Description

technical field [0001] The invention relates to the field of life prediction of creep fatigue, and more specifically relates to a method for predicting life of a discontinuous structure with double-scale creep fatigue. Background technique [0002] The working environment of key devices such as aero-engines, critical generators, and industrial gas engines is becoming more and more complex, and the service process of these devices is accompanied by severe creep fatigue load interaction. In addition, in order to realize the connection between some components in the device, it is inevitable to make holes or grooves on the components, so that these components become discontinuous structures. The non-continuous structure will produce stress concentration effect, which seriously reduces the service life of the device. Therefore, in order to ensure the safety and reliability of critical life-limited components, it is very important to accurately predict their high-temperature cree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G06F119/04
CPCG06F30/17G06F30/23G06F2119/04
Inventor 李凯尚王润梓张显程程吕一孙思波
Owner EAST CHINA UNIV OF SCI & TECH
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