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High-temperature fretting fatigue life prediction model based on continuous medium damage mechanics and method thereof

A life prediction model and fretting fatigue technology, applied in the fields of instrumentation, calculation, electrical and digital data processing, etc., can solve the problems of poor fretting fatigue life prediction effect and complex temperature effects of fretting fatigue.

Inactive Publication Date: 2019-10-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] Most of the existing fretting fatigue life prediction models are based on fretting fatigue tests at room temperature, which are not effective in predicting fretting fatigue life in high temperature environments
This is due to the fact that fretting fatigue at high temperature is very complicated by temperature

Method used

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  • High-temperature fretting fatigue life prediction model based on continuous medium damage mechanics and method thereof
  • High-temperature fretting fatigue life prediction model based on continuous medium damage mechanics and method thereof
  • High-temperature fretting fatigue life prediction model based on continuous medium damage mechanics and method thereof

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Embodiment Construction

[0067] The present invention will be further described below through specific embodiments.

[0068] A method for constructing a high-temperature fretting fatigue life prediction model based on continuum damage mechanics, comprising the following steps:

[0069] Step 1. According to the nonlinear damage accumulation model (NLCD model) based on continuum damage mechanics, the damage parameter D is defined. The damage parameter D is 0, which means the initial undamaged state; the damage parameter D is 1, and fatigue damage is considered to occur; The loading stress of the nonlinear damage accumulation model takes into account the maximum stress and the average stress, and its functional relationship is:

[0070] dD=f(σ max ,σ m ,D)dN (1)

[0071] In the formula, D is the damage parameter, σ max is the maximum stress, σ m is the average stress, N is the fatigue life;

[0072] Step 2, the nonlinear fatigue damage evolution expression of the nonlinear damage ac...

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Abstract

The invention discloses a high-temperature fretting fatigue life prediction model and method based on continuous medium damage mechanics. Based on a nonlinear fatigue damage accumulation model, the invention introduces a critical plane energy density parameter according to the concept of energy density, so as to obtain a life prediction model suitable for fretting fatigue. On the basis, a temperature-related damage rate factor is introduced to consider the influence of temperature on the fretting fatigue behavior of the structure. The application method of the model needs to utilize finite element software ANSYS, and comprises the following steps: 1) establishing a finite element model; (2) carrying out simulation calculation, (3) carrying out post-processing on the calculation result, (4)carrying out parameter fitting, and (5) carrying out calculation to obtain the fretting fatigue prediction life, can effectively predict the fretting fatigue life at high temperature and has important engineering significance.

Description

technical field [0001] The invention belongs to the field of prediction and simulation of fretting fatigue life, and in particular relates to a high-temperature fretting fatigue life prediction model based on continuum damage mechanics and its establishment method and application method. Background technique [0002] Fretting fatigue is a complex fatigue phenomenon that is affected by many factors, such as friction, slip amplitude, contact pressure, frequency, geometry, and temperature. In order to effectively predict the fretting fatigue behavior and life, researchers at home and abroad have carried out a lot of research and achieved certain results. The main models include the nominal stress method, the local stress-strain method, the fracture mechanics method, the critical plane method, and the damage mechanics method. Wait. Among them, the continuum damage mechanics method uses damage variables to describe the damage evolution process of materials to predict the failure...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/04G06F30/17G06F30/23G06F2119/08G06F2119/06
Inventor 张宏建吴博伟崔海涛温卫东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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