Creep fatigue life prediction method based on crystal plasticity

A technology for fatigue life prediction and crystal plasticity, applied in constraint-based CAD, special data processing applications, design optimization/simulation, etc., can solve problems such as failure to describe the evolution of stress-strain response damage mechanism at the micro-level

Pending Publication Date: 2021-02-12
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

This type of method focuses on the damage analysis of similar components or components at the macro...

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  • Creep fatigue life prediction method based on crystal plasticity
  • Creep fatigue life prediction method based on crystal plasticity
  • Creep fatigue life prediction method based on crystal plasticity

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Embodiment Construction

[0064] Below, according to the drawings, preferred embodiments of the present invention are given and described in detail, so that the functions and features of the present invention can be better understood.

[0065] see figure 1 A method for predicting creep fatigue life based on crystal plasticity disclosed by the present invention comprises the following steps:

[0066] S1: Obtain the EBSD (Electron Backscatter Diffraction) information of the original material through the backscattered electron diffraction technique. The EBSD information mainly includes crystal orientation and crystal structure information, and the ABAQUS representative unit model is established based on the EBSD information of the material;

[0067] Among them, S1 specifically includes:

[0068] S11: Convert the EBSD information of the material into the nodes and units in the input file readable by ABAQUS and the corresponding grain orientation file through matlab language, where the orientation paramete...

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Abstract

The invention provides a creep fatigue life prediction method based on a crystal plasticity theory. The method comprises the following steps: establishing a representative unit model of ABAQUS based on an electron back scattering diffraction technology; correcting the back stress model and writing the back stress model into a subprogram UMAT to obtain a creep fatigue hysteresis loop; fitting a creep fatigue hysteresis loop through a test parameter method to obtain material parameters; calculating a stress-strain value of each integral point and averaging the stress-strain values to obtain a creep fatigue hysteresis loop and a post-processing cloud atlas; extracting maximum plastic slippage and energy dissipation from the creep fatigue hysteresis loop and the post-processing cloud atlas, analyzing the change rule of the maximum plastic slippage and energy dissipation along with circulation cycles, and providing creep and fatigue indication factors; and predicting the creep fatigue crackinitiation life according to the indication factor. According to the creep fatigue life prediction method, plastic slippage and energy dissipation are used as fatigue and creep indication factors, the creep fatigue damage evolution rule can be better reflected, the crack initiation position can be accurately predicted, and the method has the advantages of being visual, high in applicability and high in accuracy.

Description

technical field [0001] The invention relates to the field of life prediction of creep fatigue, in particular to a creep fatigue life prediction method based on crystal plasticity theory. Background technique [0002] The working environment of modern aero-engines, industrial gas engines, supercritical generators and other devices is becoming more and more complex. In addition to the constant load of the device's steady-state operation, the key life-limiting components usually also bear the load caused by the device's start-stop and temperature fluctuations. The action of alternating loads, whose service process is accompanied by severe creep fatigue load interaction, reduces the service life of these critical life-limiting components. Therefore, in order to ensure the safety and reliability of critical life-limited components, it is very important to construct an accurate creep fatigue life prediction model. [0003] In order to accurately evaluate the durability of high-te...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F111/04G06F111/10
CPCG06F30/23G06F2111/10G06F2111/04
Inventor 王润梓李凯尚张显程张成成
Owner EAST CHINA UNIV OF SCI & TECH
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