Strain-based Probabilistic Model of Structural Fatigue Life

doi:10.16080/j.issn1671-833x.2008.21.016

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Strain-based Probabilistic Model of Structural Fatigue Life

更新时间：2025-10-30

- Strain-based Probabilistic Model of Structural Fatigue Life
- Aeronautical Manufacturing Technology Vol. 51, Issue 21, Pages: 82-85(2008)
- 作者机构：
  
  1. 北京航空航天大学能源与动力工程学院
  2. 贵州航空发动机研究所
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.2008.21.016
  CLC：
- Published：2008
- 稿件说明：
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高阳，白广忱，张瑛莉. 基于应变的结构疲劳寿命概率模型[J]. 航空制造技术, 2008, 51(21): 82-85,89.

Strain-based Probabilistic Model of Structural Fatigue Life[J]. Aeronautical Manufacturing Technology, 2008, 51(21): 82-85.
高阳，白广忱，张瑛莉. 基于应变的结构疲劳寿命概率模型[J]. 航空制造技术, 2008, 51(21): 82-85,89. DOI： 10.16080/j.issn1671-833x.2008.21.016.

Strain-based Probabilistic Model of Structural Fatigue Life[J]. Aeronautical Manufacturing Technology, 2008, 51(21): 82-85. DOI： 10.16080/j.issn1671-833x.2008.21.016.

摘要

对航空铝合金7050-T7451疲劳试验数据进行统计分析，得出其对数寿命的标准差与均值近似呈线性关系。在此基础上建立了高循环疲劳和低循环疲劳都适用的基于应变的疲劳寿命概率模型，进一步根据对数寿命均值的置信下限和标准差的置信上限给出了置信水平0.95的概率模型，并应用该模型进行了某航天器机械臂的疲劳可靠性分析，得到了其寿命分布及可靠度水平0.9987的臂管寿命。

Abstract

The linear relationship between the standard deviations and means of lgNf in different strain levels is discovered by the statistical analysis of the HCF and LCF fatigue test data of AL 7050-T7451

and a strain-based probabilistic model of fatigue life is presented

which is suitable for HCF and LCF. Furthermore

the probabilistic model with confidence of 0.95 is established based on the interval estimation of the standard deviations and means of lgNf. The fatigue reliability of a mechanical hand on space shuttle is analyzed by this model

and the distribution of fatigue life and reliable life with reliability of 0.9987 are obtained.

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