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首页> 外文会议>ASME Pressure Vessels and Piping conference >SAFETY FACTOR FOR FLAW EVALUATION OF A PIPE HAVING A CIRCUMFERENTIAL SURFACE FLAW
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SAFETY FACTOR FOR FLAW EVALUATION OF A PIPE HAVING A CIRCUMFERENTIAL SURFACE FLAW

机译：具有圆周面缺陷的管道缺陷评估的安全系数

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摘要

This paper describes the safety factors used for fracture assessments of pipes having circumferential surface flaws. The "Fitness-For-Services Codes (the FFS Codes)" of the Japan Society of Mechanical Engineers (JSME) restrict the depths of flaws according to their angles to prevent pipes with flaws from being fracture. Past restrictions were determined based on deterministic evaluations. In fracture assessments of pipes having flaws, however, the effects of measurement errors in flaw dimensions and of variations on material strength must be taken into account. Thus, we evaluated the effects of such variations on fracture assessments of pipes having flaws, and examined safety factors for giving failure probability (or reliability) equal, irrespective of the cracking angles. We found out that failure probability is heavily dependent on the measurement accuracy of flaw depths and material strength (flow stress). In view of this finding, we examined and proposed a simple approach which meets the target reliability without conducting complex evaluations by the Monte Carlo method and reliability evaluation methods (e.g., first-order second-moment method (FOSM)).
机译：本文介绍了用于评估具有圆周表面缺陷的管道断裂的安全系数。日本机械工程师协会（JSME）的“适用于服务的规范”（FFS规范）根据缺陷的角度限制缺陷的深度，以防止有缺陷的管道破裂。过去的限制是根据确定性评估确定的。但是，在对有缺陷的管道进行断裂评估时，必须考虑缺陷尺寸的测量误差以及材料强度变化的影响。因此，我们评估了这种变化对有缺陷的管道的断裂评估的影响，并检查了使破裂概率（或可靠性）均等的安全因素，而与开裂角度无关。我们发现，失效概率在很大程度上取决于缺陷深度和材料强度（流动应力）的测量精度。鉴于此发现，我们研究并提出了一种简单的方法，该方法可以满足目标可靠性，而无需通过蒙特卡洛方法和可靠性评估方法（例如一阶第二阶矩方法（FOSM））进行复杂的评估。

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