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Metal component thermal mechanical fatigue life prediction method based on different constraint conditions

A technology of thermomechanical fatigue and constraint conditions, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve the problem of lack of applicability of fatigue life, Non-conservative or too conservative and other issues, to achieve the effect of high applicability, good applicability, and accurate service life

Pending Publication Date: 2020-07-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

Due to the influence of thermal load and mechanical load interaction coupling on material fatigue, the cycle failure cycle is often less than 10 5
Although the theoretical derivation of this type of method is relatively rigorous, because it does not consider the actual service state of the component and the most important influencing factors, non-conservative or overly conservative results often appear in the life prediction process. Fatigue life of components lacks applicability

Method used

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  • Metal component thermal mechanical fatigue life prediction method based on different constraint conditions
  • Metal component thermal mechanical fatigue life prediction method based on different constraint conditions
  • Metal component thermal mechanical fatigue life prediction method based on different constraint conditions

Examples

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Embodiment 1

[0040] This embodiment is to predict the life of the cast aluminum material for the piston under the thermomechanical fatigue condition, and the prediction process is as follows figure 1 As shown, the specific process is as follows:

[0041] First, the cast aluminum material is taken from the diesel engine piston. According to the working conditions, the load spectrum of the temperature, thermal strain, mechanical strain and constraint coefficient η of the most vulnerable part of the piston component is drawn with time. The constraint ratio in dangerous state is -0.11, such as figure 2 (a).

[0042] Second, according to the actual working conditions, the accelerated thermomechanical fatigue experiment under constraint is carried out. The loading conditions are as follows: figure 2 (b) shown. The temperature range of the test cycle is 120-425 ° C, and the loading constraint coefficient is from -1.5 to 1.5 (in-phase: η = -0.75, -1.0, -1.25, -1.5; anti-phase: η = 0.75, 1.0, ...

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Abstract

The invention discloses a metal component thermal mechanical fatigue life prediction method based on different constraint conditions, and belongs to the technical field of material science and engineering application. The method comprises the steps that firstly, according to a service working condition, the load condition faced by a service component is obtained, a thermo-mechanical fatigue test of a metal material in a constraint state is designed and carried out, the relation between thermo-mechanical fatigue cycle hysteretic energy and a constraint coefficient is determined, a hysteretic energy model is established, and related parameters are obtained; according to the hysteretic energy accumulation damage model, the method for predicting the thermal mechanical fatigue life under different constraint conditions is established, and then the service time of the component under the actual service working condition can be deduced. According to the method, the thermal mechanical fatiguelife of the material can be accurately predicted by constraining a thermal mechanical fatigue acceleration test, and meanwhile, the method can also be used for evaluating the performance of a component under an actual service condition.

Description

technical field [0001] The invention relates to the technical field of component service load spectrum and thermomechanical fatigue performance test of metal materials, in particular to a method for predicting the thermomechanical fatigue life of metal components based on different constraint conditions. Background technique [0002] In many fields such as aerospace, energy and power, many hot-end components (internal combustion engine pistons, gas turbine blades and turbine disks, etc.) operate under high temperature conditions and cyclic loads for a long time. The cyclic loads include three types of loads, namely: assembly load, Machine loads and thermal loads. According to the failure analysis, the main failure mode is thermomechanical fatigue damage caused by the reciprocating action of thermal load and mechanical load. Due to the influence of thermal load and mechanical load interaction coupling on material fatigue, the cycle failure cycle is often less than 10 5 . I...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/08G06F119/04G01M13/00
CPCG01M13/00
Inventor 庞建超王猛李守新张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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