交通运输工程学报
JOURNAL OF TRAFFIC AND TRANSPORTATION ENGINEERING
2006 Vol.6 No.1 P.25-28


基于Forman方程的随机疲劳长裂纹扩展概率模型

杨冰  赵永翔  张卫华 

摘 要:为了提高随机疲劳长裂纹扩展率预测精度,基于Forman方程,发展了随机疲劳长裂纹扩展概率模型及其参数测定方法,考虑数据分散性规律和试样数量对概率评价的影响,得到了包含存活概率曲线、置信度曲线和两者融合曲线在内的长裂纹扩展率关系曲线,在给定应力强度因子范围内,裂纹扩展率服从对数正态分布条件下,采用线性回归和极大似然法测定模型参数.对铁道车辆LZ50车轴钢裂纹扩展数据分析表明,该模型反映了材料断裂韧度对长裂纹扩展率的影响,克服了基于Paris-Erdogan方程的概率模型在高应力强度因子范围预测偏于危险的缺陷,验证了该模型的合理性.
关键词:车辆工程;长疲劳裂纹;概率模型;Forman方程
分类号:U270;O346.2  文献标识码:A

文章编号:1671-1637(2006)01-0025-04

Probabilistic Models of Random Fatigue Crack Propagation Based on Forman Equation

YANG Bing  ZHAO Yong-xiang  ZHANG Wei-hua 

基金项目:国家自然科学基金项目(50375130,50323003);全国优秀博士学位论文作者专项基金项目(200234);铁道部科技研究开发计划项目(2001J016);西南交通大学博士研究生创新基金项目(080203)
作者简介:杨冰(1979-),男,湖南衡阳人,西南交通大学工学博士研究生,从事结构可靠性设计分析与PSA研究.
作者单位:杨冰(西南交通大学,牵引动力国家重点实验室,四川,成都,610031) 
     赵永翔(西南交通大学,牵引动力国家重点实验室,四川,成都,610031) 
     张卫华(西南交通大学,牵引动力国家重点实验室,四川,成都,610031) 

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收稿日期:2005年9月10日

出版日期:2006年3月31日

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