寿命服从对数正态分布、有置信度时概率疲劳S-N曲线的合理重构

赵永翔; 杨冰; 彭佳纯

寿命服从对数正态分布、有置信度时概率疲劳S-N曲线的合理重构

西南交通大学牵引动力国家重点实验室,成都 610031

基金项目: 863计划资助项目(2006AA04Z406);国家自然科学基金资助项目(50375130;50323003;50575189);全国优秀博士学位论文作者专项资金资助项目(200234);教育部新世纪人才培养计划资助项目(NCET-04-0890)

详细信息

作者简介:
赵永翔(1963- ),男,四川金堂人,教授,博士,博导(联系人.Tel:+86-28-87600935;+86-28-87600868;E-mail:yxzhao@home.swjtu.edu.cn).

中图分类号: O346.2；TB114.3；U270.331
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出版历程
- 收稿日期: 2005-12-13
- 修回日期: 2007-01-30
- 刊出日期: 2007-04-15

Reconstruction of the Probabilistic S-N Curves Under Fatigue Life Following Lognormal Distribution With a Given Confidence

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, P. R. China

摘要

摘要: 当概率疲劳S-N曲线以特定存活概率(P)和置信度(C)的方式给出并无法重做试验时，除特定P-C外无法做其它概率水平的可靠性分析．因此，需要广泛适用的曲线模型．建立了疲劳寿命服从对数正态分布时疲劳试验S-N数据及广义曲线的Monte Carlo模拟重构方法．为了避免现有人为放大样本到数千给出偏危险评价，从实际试验情况出发，采用了材料小试样每组样本7至20、结构试样每组样本至多10个、还原统计参量误差小于5%的模拟策略．然后，依据模拟数据利用回归法重建了可实现任意P-C水平可靠性分析的P-C-S-N曲线．铁路60Si2Mn高强度弹簧钢概率曲线的重构实践说明了方法的有效性与适用性．
- 疲劳 /
- 概率S-N曲线 /
- 重构 /
- Monte Carlo模拟
Abstract: When the historic probabilistic S-N curves were given under special survival probability and confidence levels and there is no possibility to retest, fatigue reliability analysis at other levels can not be done except for the special levels. Therefore, the widely applied curves are expected. Monte Carlo reconstruction methods of the test data and the curves are investigated under fatigue life following lognormal distribution. To overcome the non-conservative assessment of existent man-made enlarging the sample size up to thousands, a simulation policy is employed to address the true production which the sample size is controlled less than 20 for material specimens, 10 for structural component specimens and the errors matching the statistical parameters less than 5%. Availability and feasibility of the present methods have been indicated by the reconstruction practice of the test data and curves for 60Si2Mn high strength spring steel of railway industry.
- fatigue /
- probabilistic S-N curves /
- reconstruction /
- Monte Carlo simulation

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参考文献(16)

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寿命服从对数正态分布、有置信度时概率疲劳S-N曲线的合理重构

作者简介:
赵永翔(1963- ),男,四川金堂人,教授,博士,博导(联系人.Tel:+86-28-87600935;+86-28-87600868;E-mail:yxzhao@home.swjtu.edu.cn).

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Reconstruction of the Probabilistic S-N Curves Under Fatigue Life Following Lognormal Distribution With a Given Confidence

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寿命服从对数正态分布、有置信度时概率疲劳S-N曲线的合理重构

作者简介: 赵永翔(1963- ),男,四川金堂人,教授,博士,博导(联系人.Tel:+86-28-87600935;+86-28-87600868;E-mail:yxzhao@home.swjtu.edu.cn).

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出版历程

Reconstruction of the Probabilistic S-N Curves Under Fatigue Life Following Lognormal Distribution With a Given Confidence

计量

出版历程

目录

作者简介:
赵永翔(1963- ),男,四川金堂人,教授,博士,博导(联系人.Tel:+86-28-87600935;+86-28-87600868;E-mail:yxzhao@home.swjtu.edu.cn).