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焊接接头低周疲劳裂纹扩展的统计分析与可靠性最弱环模型
引用本文:陈裕,王铁军,程光旭.焊接接头低周疲劳裂纹扩展的统计分析与可靠性最弱环模型[J].应用力学学报,1999(3).
作者姓名:陈裕  王铁军  程光旭
作者单位:西安交通大学!西安710049
基金项目:国家自然科学基金,西安交通大学金属材料强度国家重点实验室基金,西安交通大学科研基金
摘    要:在相同的试验条件下,对16MnR压力容器用钢焊接接头焊缝区、热影响区和母材区,分别做了15 根试样的低周疲劳试验,获得了三个区的低周疲劳寿命分布与裂纹扩展规律。试验表明,Paris公式中的两个参数m 和c 分别服从正态分布和对数正态分布,m 和log c 呈现统计线性关系。根据文中的统计结果,采用蒙特卡洛法对给定的两个裂纹长度间的扩展寿命进行了预测,预测结果与试验结果符合良好。文中还对焊接接头三个区的低周疲劳寿命进行了统计分析,获得了相应的概率密度函数,初步提出了整个焊接接头的可靠性最弱环模型。

关 键 词:低周疲劳  可靠性  焊接接头  裂纹扩展  疲劳寿命

Statistical Analysis of the Low Cycle Fatigue Crack Propagation and a Reliability Model for a Welded Joint
Abstract:Low cycle fatigue (LCF) experiments were carried out for a pressure vessel steel 16MnR, its weld heat affected zone (HAZ) and weld metal, respectively. The LCF crack propagation behavior in the above mentioned zones was statistically analyzed and a probabilistic LCF crack propagation model was proposed. Moreover, the well known Monte Carlo method was used to calculate the distributions of the LCF crack propagation life of the base metal, weld metal and HAZ, respectively. Finally, a reliability model was proposed for the welded joint.
Keywords:low cycle fatigue  reliability  welded joint  crack propagation  fatigure life  
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