含表面缺陷的压力容器疲劳寿命数值模拟
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摘要
针对压力容器的失效分析,考虑几种主要参数的不确定性和随机性,应用蒙特卡罗模拟法抽样计算了服从某种特定分布的随机变量。利用数值积分法编制计算机程序,分别求出在一定可靠度和置信度下的疲劳寿命;求出相应的可靠度和失效概率。比较了不同初始裂纹尺寸和断裂韧性对疲劳寿命的影响,并给出了算例。分析结果表明,方法具有较高的应用价值和工程意义。
According to the failure analysis of pressure vessel,and considering several primary uncertain factors,the random variables which had some certain distributions were calculated by Mote-Carlo simulation method.A computer program was developed by numerical integration method,the fatigue life under given reliability and credit degree was gained.The reliability and failure probability of pressure vessel were also obtained.The fatigue life in different crack size was compared,and an example was given.It had great application and engineering significance by analyzing the result.
According to the failure analysis of pressure vessel,and considering several primary uncertain factors,the random variables which had some certain distributions were calculated by Mote-Carlo simulation method.A computer program was developed by numerical integration method,the fatigue life under given reliability and credit degree was gained.The reliability and failure probability of pressure vessel were also obtained.The fatigue life in different crack size was compared,and an example was given.It had great application and engineering significance by analyzing the result.
引文
[1]杨国军.压力容器焊缝及其附近微裂纹的检测[J].制造业自动化,2010,32(12):17-22.
[2]金志江,韩树新.基于循环J积分的压力容器疲劳寿命预测的数值模拟[J].机械工程学报,2007,43(10):191-195.
[3]马宇山,金涛.基于ANSYS的塔设备地震与风载分析[J].制造业自动化,2010,32(1):1-5.
[4]陈群,孙磊.蒙特卡洛法在投标报价中的应用[J].武汉理工大学学报(信息与管理工程版),2009,31(3):503-506.
[5]张伟,崔维成,查子初,王志群.厚壁筒结构疲劳寿命的可靠性分析[J].工程力学,1996,13(4):59-68.
[6]孙奉仲.换热器的可靠性与故障分析导论[M].北京:中国标准出版社,1998.248-250.
[2]金志江,韩树新.基于循环J积分的压力容器疲劳寿命预测的数值模拟[J].机械工程学报,2007,43(10):191-195.
[3]马宇山,金涛.基于ANSYS的塔设备地震与风载分析[J].制造业自动化,2010,32(1):1-5.
[4]陈群,孙磊.蒙特卡洛法在投标报价中的应用[J].武汉理工大学学报(信息与管理工程版),2009,31(3):503-506.
[5]张伟,崔维成,查子初,王志群.厚壁筒结构疲劳寿命的可靠性分析[J].工程力学,1996,13(4):59-68.
[6]孙奉仲.换热器的可靠性与故障分析导论[M].北京:中国标准出版社,1998.248-250.
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