ANALYSIS OF NONLINEAR CUMULATIVE DAMAGE MODEL CONSIDERING STRENGTH DEGRADATION

LI Wei

doi:10.16579/j.issn.1001.9669.2020.03.031

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ANALYSIS OF NONLINEAR CUMULATIVE DAMAGE MODEL CONSIDERING STRENGTH DEGRADATION

更新时间：2022-09-22

- ANALYSIS OF NONLINEAR CUMULATIVE DAMAGE MODEL CONSIDERING STRENGTH DEGRADATION
- Journal of Mechanical Strength Vol. 42, Issue 3, Pages: 723-727(2020)
- 作者机构：
  
  1. 北京交通大学机械与电子控制工程学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2020.03.031
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LI Wei. ANALYSIS OF NONLINEAR CUMULATIVE DAMAGE MODEL CONSIDERING STRENGTH DEGRADATION. [J]. 42(3):723-727(2020)
DOI：

LI Wei. ANALYSIS OF NONLINEAR CUMULATIVE DAMAGE MODEL CONSIDERING STRENGTH DEGRADATION. [J]. 42(3):723-727(2020) DOI： 10.16579/j.issn.1001.9669.2020.03.031.

摘要

工程结构在服役过程中,累积损伤和强度退化同时发生,并相互影响。传统的累积损伤模型大多忽略了强度退化对损伤累积的影响。为建立考虑强度退化的Corten-Dolan累积损伤模型,通过分析强度退化模型推导出强度退化系数,将Corten-Dolan模型中的指数参数d定义为与强度退化系数有关的指数函数。通过试验数据和与文献结果对比验证了改进Corten-Dolan模型的有效性。研究表明:改进的Corten-Dolan模型可以很好地预测疲劳寿命,预测精度比传统Corten-Dolan模型更高。

Abstract

Fatigue damage accumulation and strength degradation occur simultaneously and interact with each other during service of engineering structures. In order to establish an improved Corten-Dolan cumulative damage model that takes the effects of strength degradation in consideration,strength degradation coefficient was deduced by analyzed the strength degradation model,then the exponential parameter d in the Corten-Dolan model was defined as an exponential function related to the strength degradation coefficient. Effectiveness of the improved Corten-Dolan model was verified by fatigue test data of material and comparison with other references. The results show that the improved Corten-Dolan model predicts fatigue life accurately,prediction is more accurate than the traditional Corten-Dolan model.

关键词

疲劳累积损伤强度退化改进Corten-Dolan模型寿命预测

Keywords

Fatigue damage accumulationStrength degradationImproved Corten-Dolan modelFatigue life prediction

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