Prediction method for low-cycle fatigue life of thermal aging material

A low-cycle fatigue and prediction method technology, applied in computer materials science, greenhouse gas reduction, instruments, etc., can solve the problem of inaccurate prediction of low-cycle fatigue life

Pending Publication Date: 2022-05-20
BEIJING INST OF STRUCTURE & ENVIRONMENT ENG
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Problems solved by technology

[0004] The invention provides a method for predicting the low-cycle fatigue life of heat-aging materials, which solves the problem that the low-cycle fatigue life of materials in the prior art cannot be accurately predicted during heat aging

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  • Prediction method for low-cycle fatigue life of thermal aging material
  • Prediction method for low-cycle fatigue life of thermal aging material
  • Prediction method for low-cycle fatigue life of thermal aging material

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Embodiment Construction

[0035] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0036] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0037] For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encomp...

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Abstract

The invention provides a method for predicting the low-cycle fatigue life of a thermal aging material, and the method comprises the steps: S1, determining a fatigue strength coefficient sigma'f, a fatigue strength index b, a cyclic strength coefficient K and a cyclic strain hardening index n of the material when the material is not aged; determining a fatigue strength coefficient sigma'f, a fatigue strength index b, a cyclic strength coefficient K and a cyclic strain hardening index n of the material at different aging times, and establishing a function relationship with the aging time; s2, determining the relationship between the fatigue ductility coefficient epsilon'f and the aging time and between the fatigue ductility index c and the aging time according to K, n, sigma'f and b; s3, sigma'f, b, epsilon'f, c are substituted into a Basic-Manson-Coffin equation, and a low-cycle fatigue life prediction equation suitable for different aging times is obtained. According to the method, the problem that the low-cycle fatigue life of the material in thermal aging cannot be accurately predicted in the prior art is effectively solved.

Description

technical field [0001] The present invention relates to the technical field of the fatigue life prediction method, in particular to a method for predicting the low-cycle fatigue life of thermally aged materials. Background technique [0002] The service environment of nuclear power materials is harsh, and they have been exposed to high temperature (280-320°C) and high pressure (about 15MPa) for a long time. Under this condition, the material is prone to microstructural transformation and thermal embrittlement, which reduces the plasticity and toughness of the material and reduces the hardness. The increase of brittleness greatly increases the risk of sudden failure of structural components, which is an important factor affecting the safe operation of nuclear power plants. [0003] Fatigue damage refers to the process in which the material continuously produces permanent cumulative damage under the action of cyclic loads far below the tensile strength level, and the material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C60/00
CPCG16C60/00Y02E30/30
Inventor 邢睿思王龙宋俊柏孔凡金刘武刚苏蕴荃吴振强侯传涛任方
Owner BEIJING INST OF STRUCTURE & ENVIRONMENT ENG
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