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首页> 美国卫生研究院文献>Journal of Pressure Vessel Technology >Sensitivity Analysis of Fitness-for-Service Assessment Based on Reliability for Cylindrical Pressure Vessels With Local Metal Loss
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Sensitivity Analysis of Fitness-for-Service Assessment Based on Reliability for Cylindrical Pressure Vessels With Local Metal Loss

机译：基于可靠性的局部金属损失圆柱压力容器服务质量评估敏感性分析

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Concern about fitness-for-service (FFS) assessments using stochastic analyses for aged pressure equipment with local metal loss has been growing. When a decision must be made regarding whether to run or repair equipment with local metal loss, a structural integrity assessment based on reliability helps. In analyses of failure probability, it is important to identify which variables strongly affect the structural integrity. The stochastic properties of influential parameters must be clarified, but few data have been published regarding the quantitative analysis of the sensitivity of the parameters in FFS assessments of components with local metal loss. Here, we investigated the effects of parameters on the plastic collapse of a damaged cylindrical pressure vessel with local metal loss, in an evaluation of parameter sensitivity. We also analyzed sensitivity indices for the component with several shapes of local metal loss. We found that the corrosion rate has a major influence on the probability of failure. We propose a practical stochastic analysis procedure for components with local metal loss. In this procedure, the parameter that has consistently low sensitivity to the limit state is used as a constant value.
机译：对使用局部金属损耗的老化压力设备进行随机分析的服务寿命（FFS）评估越来越引起人们的关注。当必须决定是否要运行或维修具有局部金属损失的设备时，基于可靠性的结构完整性评估会有所帮助。在分析失效概率时，重要的是要确定哪些变量会严重影响结构完整性。必须弄清影响参数的随机性质，但有关在局部金属损失的零件的FFS评估中对参数敏感性进行定量分析的数据很少发表。在这里，我们在参数敏感性评估中，研究了参数对受损的圆柱形压力容器具有局部金属损失的塑性塌陷的影响。我们还分析了具有多种形状的局部金属损耗的组件的灵敏度指标。我们发现腐蚀速率对失效概率有重大影响。我们针对具有局部金属损耗的组件提出了一种实用的随机分析程序。在此过程中，对极限状态的敏感度始终较低的参数将用作常数。

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