IMPROVED FORMULA FOR FATIGUE CRACK GROWTH RATEUNDER DIFFERENT STRESS RATIO

WU QiaoGuo; CHEN XueDong; FAN ZhiChao; NIE DeFu; WEI RenChao

doi:10.16579/j.issn.1001.9669.2017.01.027

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IMPROVED FORMULA FOR FATIGUE CRACK GROWTH RATEUNDER DIFFERENT STRESS RATIO

更新时间：2022-09-22

- IMPROVED FORMULA FOR FATIGUE CRACK GROWTH RATEUNDER DIFFERENT STRESS RATIO
- Journal of Mechanical Strength Vol. 39, Issue 1, Pages: 160-165(2017)
- 作者机构：
  
  1. 合肥通用机械研究院国家压力容器与管道安全工程技术研究中心
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2017.01.027
  CLC：
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WU QiaoGuo, CHEN XueDong, FAN ZhiChao, et al. IMPROVED FORMULA FOR FATIGUE CRACK GROWTH RATEUNDER DIFFERENT STRESS RATIO. [J]. 39(1):160-165(2017)
DOI：

WU QiaoGuo, CHEN XueDong, FAN ZhiChao, et al. IMPROVED FORMULA FOR FATIGUE CRACK GROWTH RATEUNDER DIFFERENT STRESS RATIO. [J]. 39(1):160-165(2017) DOI： 10.16579/j.issn.1001.9669.2017.01.027.

摘要

研究金属材料在不同应力比下的疲劳裂纹扩展速率描述公式,包括Ⅰ型、Ⅲ型和Ⅰ-Ⅲ型三种模式。基于现有疲劳裂纹扩展速率公式和对试验数据进行归纳,建立了以J积分变化幅ΔJ为控制参量的疲劳裂纹扩展速率改进公式。在公式中,通过引入应力比修正系数M将不同应力比R下的数据ΔJ等效到R=0时对应的ΔJeq0,并给出了M~R的经验关系式。最后,通过对文献中Ⅰ型、Ⅲ型和Ⅰ-Ⅲ型的疲劳裂纹扩展速率试验数据进行分析发现,本文建立的改进公式可以对不同应力比下的试验数据进行较好的描述。

Abstract

An improved formula for fatigue crack growth rate in mode I,mode III and mixed mode I-III under different stress ratio R was proposed,which was based on J-integral range ΔJ. In the formula,the test data under different R could be normalized by correction factor M,which changed the test ΔJ under different R to ΔJeq0under R = 0,and the relationship of M and R was obtained empirically. The proposed formula was validated with available experimental fatigue crack growth data in mode I,mode III and mixed mode I-III under different stress ratio from literatures. It transpires that these test data can be well described with the present formula.

关键词

疲劳裂纹扩展速率J积分Ⅰ、Ⅲ、Ⅰ-Ⅲ型应力比改进公式

Keywords

Fatigue crack growth rateJ-integralMode ⅠⅢ and Ⅰ-ⅢStress ratioImproved formula

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