A Nondestructive Prediction Method for Low Cycle Fatigue Life of Thermally Aged Materials Using 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 no aging time and long time, and achieve simple and fast measurement, non-destructive prediction, and reduction The effect of the number of experiments

Active Publication Date: 2022-05-13
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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  • A Nondestructive Prediction Method for Low Cycle Fatigue Life of Thermally Aged Materials Using Hardness
  • A Nondestructive Prediction Method for Low Cycle Fatigue Life of Thermally Aged Materials Using Hardness
  • A Nondestructive Prediction Method for Low Cycle Fatigue Life of Thermally Aged Materials Using 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 method for non-destructive prediction of low-cycle fatigue life of thermally aged materials by using hardness, characterized in that: the steps of the prediction method are: S1, measuring and obtaining the strain-life curves of unaged and aged materials; S2, Measure the surface hardness of the material in the process of unaging and heat aging, and establish the mathematical relationship between the material hardness and the cyclic strength coefficient K' and the cyclic strain hardening exponent n'; S3, the mathematical relationship between K' and n' established in step S2 Substituting the relationship into the Basquin-Manson-Coffin equation to establish the mathematical relationship between surface hardness and fatigue life; S4, obtaining the general relationship between hardness and predicted fatigue life. The invention has scientific and reasonable design, simple and fast measurement, improves prediction efficiency, and can provide guarantee for the use safety of materials; at the same time, only non-aging and a small amount of aging test data are needed, so as to realize the fatigue resistance of this material under the aging temperature and duration The lifetime is predicted, greatly reducing the number of experiments.

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 Patents(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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