Nondestructive prediction method for low-cycle fatigue life of thermal aging material by utilizing hardness

A prediction method and low-cycle fatigue technology, applied in computer material science, design optimization/simulation, special data processing applications, etc., can solve problems such as long time and no aging time, achieve non-destructive prediction, simple and fast measurement, reduce The effect of the number of experiments

Active Publication Date: 2020-10-30
TIANJIN UNIV
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Problems solved by technology

However, due to the long time required for accelerated aging tests, engineering applications often do not have sufficient aging time

Method used

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  • Nondestructive prediction method for low-cycle fatigue life of thermal aging material by utilizing hardness
  • Nondestructive prediction method for low-cycle fatigue life of thermal aging material by utilizing hardness
  • Nondestructive prediction method for low-cycle fatigue life of thermal aging material by utilizing hardness

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Embodiment Construction

[0032] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0033] In this embodiment, the constant-amplitude uniaxial tension-compression strain load spectrum of cast austenitic stainless steel Z3CN20.09M, which is commonly used in nuclear power, is taken as an example under thermal aging.

[0034] (1) Measure the strain-life curve of unaged and aged materials

[0035] The fatigue life of the material is not aged, aged for 300 hours, aged for 1000 hours, aged for 3000 hours and aged for 10000 hours, when the strain corrosion is 0.2%, 0.4%, 0.6% and 0.8%, the fatigue life changes with the thermal aging time. figure 1 As shown, the change trend of elastic strain corrosion with 2 times fatigue life is as follows figure 2 shown. It can be seen from the figure that the parameters in the Basquin-Manson...

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Abstract

The invention relates to a nondestructive prediction method for the low-cycle fatigue life of a thermal aging material by using hardness. The nondestructive prediction method is characterized by comprising the following steps: S1, measuring and obtaining a strain-life curve of an unaged and aged material; s2, measuring the surface hardness of the material in non-aging and thermal aging processes,and establishing a mathematical relationship between the material hardness and a cyclic strength coefficient K'and a cyclic strain hardening index n '; s3, substituting the mathematical relationship between the K' and the n 'established in the step S2 into a Baquiin-Manson-Coffin equation, and determining a mathematical relationship between the surface hardness and the fatigue life; and S4, obtaining a universal relationship between the hardness and the predicted fatigue life. The method is scientific and reasonable in design and simple, convenient and quick in measurement, improves the prediction efficiency, and can provide guarantee for the use safety of materials; meanwhile, only data of non-aging and a small amount of aging tests are needed, so that the fatigue life of the material atthe used aging temperature and duration is predicted, and the number of experiments is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of fatigue life prediction under thermal aging, and relates to low cycle fatigue life prediction, in particular to a non-destructive prediction method for low cycle fatigue life of heat aging materials by using hardness. Background technique [0002] Nuclear power materials are prone to phase transition when they are in the range of 280-320 °C for a long time, resulting in thermal aging brittleness, which reduces the plasticity and toughness of the material and increases the hardness and brittleness, thereby increasing the possibility of sudden failure of components and affecting the safe operation of nuclear power plants. . Studies have shown that thermal aging is mainly caused by the instability of the ferrite phase in stainless steel, including the amplitude modulation decomposition of ferrite and the precipitation reaction at the phase boundary between ferrite and austenite. [0003] Fatigue is a proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G16C60/00G06F119/04
CPCG06F30/20G16C60/00G06F2119/04
Inventor 陈旭郭灿孙兴悦石守稳
Owner TIANJIN UNIV
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