QT400-18疲劳裂纹扩展寿命可靠性分析

赵军峰; 刘伟; 王辉; 闫富华; 徐胜利

doi:10.13433/j.cnki.1003-8728.2015.0624

QT400-18疲劳裂纹扩展寿命可靠性分析

doi: 10.13433/j.cnki.1003-8728.2015.0624

1.
西北工业大学力学与土木建筑学院, 西安 710129;
2.
中国船舶重工集团公司第十二研究所, 兴平 713102

基金项目:

国家自然科学基金项目（51305350）与陕西省自然科学基础研究计划项目（2013JM6011）资助

详细信息

作者简介:
赵军峰（1989-），硕士研究生，研究方向为材料的疲劳可靠性分析，junfeng_zhao@yeah.net

通讯作者:
刘伟，副教授，博士，liuweinpu@163.com

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出版历程
- 收稿日期: 2013-10-10
- 刊出日期: 2015-06-05

Reliability Analysis of Fatigue Crack Growth Life of QT400-18

1.
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710129, China;
2.
CSIC No.12 Research Institute, Xingping 713102, China

摘要

摘要: 采用概率断裂力学方法研究了船用柴油机机身球墨铸铁材料（QT400-18）的裂纹扩展寿命可靠性。基于QT400-18的裂纹扩展试验，考虑了裂纹扩展速率的分散性，采用统计分析获得了Paris公式参数的分布特征，建立了QT400-18裂纹扩展速率的随机概率模型。反推得到了da/dN≤10-7 mm/cycle时材料的疲劳启裂门槛值。进一步建立了剩余寿命预测模型，通过数值抽样仿真，得到了不同初始裂纹长度下的裂纹扩展剩余寿命及其分布，并建立了剩余寿命与可靠度关系图谱。
- 球墨铸铁 /
- 裂纹扩展速率 /
- 概率模型 /
- 寿命可靠性
Abstract: This paper investigated the reliability evaluation process of crack propagation life of marine diesel engine body material QT400-18 with probabilistic fracture mechanics method. Based on the crack propagation experiments of QT400-18 and considering the dispersion of crack propagation rate, we obtain the Paris formula parameters with statistical analysis, and establish a random probability model of crack propagation rate of QT400-18. Furthermore, a residual life reliability prediction model is also built. Through the numerical sampling simulation, the residual life and its distribution in different initial crack length are achieved and the correlation curve of reliability with residual life is drawn. In the condition of, the threshold of fatigue crack growth is obtained with an inversion approach.
- crack initiation /
- crack propagation rate /
- crack tips /
- diesel engines

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参考文献(15)

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