| 基于疲劳寿命模型的压力容器疲劳分析 |
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| 引用本文： | 王茂廷,刘佳,王莲,钱桂安.基于疲劳寿命模型的压力容器疲劳分析[J].石油化工设备,2006,35(1):34-36. |
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| 作者姓名： | 王茂廷 刘佳 王莲 钱桂安 |
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| 作者单位： | 1. 辽宁石油化工大学机械工程学院,辽宁抚顺,113001
2. 辽宁石油化工大学外国语学院,辽宁抚顺,113001 |
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| 摘 要： | 含缺陷压力容器的疲劳分析是石油化工行业的一个重要课题,通过分析影响裂纹扩展寿命的多个随机因素及使用疲劳寿命模型,讨论了裂纹尺寸的计算方法。考虑压力容器所承受载荷、材料断裂韧度及裂纹尺寸等参数,使用一次二阶矩法和Monte Carlo法,得出了在一定可靠度下的疲劳裂纹扩展寿命,计算了一定使用寿命时结构的失效概率,比较了不同初始裂纹尺寸对疲劳寿命的影响。算例表明,此方法可为含裂纹结构的概率损伤容限评估提供一定的理论依据。
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| 关 键 词： | 压力容器 疲劳可靠 蒙特卡罗法 一次二阶矩法 |
| 文章编号： | 1000-7466(2006)01-0034-03 |
| 修稿时间： | 2005年7月23日 |
Fatigue analysis of pressure vessel based on fatigue life model |
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| WANG Mao-ting,LIU Jia,WANG Lian,QIAN Gui-an.Fatigue analysis of pressure vessel based on fatigue life model[J].Petro-Chemical Equipment,2006,35(1):34-36. |
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| Authors: | WANG Mao-ting LIU Jia WANG Lian QIAN Gui-an |
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| Abstract: | The fatigue analysis of the pressure vessels is an important task in the petroleum chemical engineering.By analyzing stochastic of effect on the fatigue crack propagation life,fatigue life model was used.The calculation methods for crack size are discussed.Considering the random characters of the loads,material fracture toughness,defect sizes and other parameters,the fatigue crack propagation life under a certain reliability and failure probability under a certain life are obtained by using the first order second moment method and Monte Carlo method.Fatigue life of different crack sizes was compared.An example was used to explain its application in reliability estimate of fatigue life and its engineering significance.It was suitable to the probabilistic damage tolerance evaluation of structures including all kinds of cracks. |
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| Keywords: | pressure vessel fatigue reliability Monte Carlo method the first order second moment method |
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