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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.2: Computer Technology; 20050717-21; Denver,CO(US) >THE APPLICATION OF THE LINEAR MATCHING METHOD TO THE LIFE ASSESSMENT METHOD R5: A COMPARISON
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THE APPLICATION OF THE LINEAR MATCHING METHOD TO THE LIFE ASSESSMENT METHOD R5: A COMPARISON

机译：线性匹配方法在生活评估方法R5中的应用：比较

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摘要

The Life Assessment Method R5 is widely used for the assessment of power plant at high temperatures. The procedure involves the application of a sequence of rules that provide margins of safety against a range of possible failure modes, plastic collapse, ratchetting, fatigue failure, creep rupture and creep/fatigue interaction. Within R5 this is achieved by using limit load and shakedown methods, combined with Neuber's rule and the evaluation of elastic follow-up factors. In recent years, the Linear Matching Method has been developed so that it is capable of providing optimal solutions for each of these criteria, thereby giving less conservative margins of safety, but adopting the same use of material data as R5. The paper describes a detailed comparison between the approach currently used in R5 and the result of the application of the Linear Matching Method, for the entire range of failure modes and for a simple example. The purpose of this comparison is to assess the circumstances where Linear Matching Methods may have a distinct advantage over current methods. The example consists of a square plate containing a circular hole. The plate is subjected to uniaxial loading and a radial varying temperature field. For all failure modes the Linear Matching Method gives less conservative results compared with standard R5 methods. The differences can be very significant, particularly for the prediction of strength limits; limit load, shakedown load and ratchet limit. Significantly lower and less conservation elastic follow-up factors were also obtained. The comparison demonstrates the advantages of the Linear Matching Method in this context.
机译：寿命评估方法R5被广泛用于高温电厂的评估。该程序涉及一系列规则的应用，这些规则为各种可能的失效模式，塑性塌陷，咬合，疲劳失效，蠕变破裂和蠕变/疲劳相互作用提供了安全裕度。在R5内，这是通过使用极限载荷和减振方法，结合Neuber规则和评估弹性后续因子来实现的。近年来，已经开发出线性匹配方法，从而能够为每个标准提供最佳解决方案，从而降低了安全性的保守范围，但采用的材料数据与R5相同。本文描述了在R5中当前使用的方法与线性匹配方法的应用结果之间的详细比较，包括整个故障模式范围和一个简单示例。进行比较的目的是评估线性匹配方法可能比当前方法具有明显优势的情况。该示例由包含圆形孔的正方形板组成。该板承受单轴载荷和径向变化的温度场。与标准R5方法相比，对于所有故障模式，线性匹配方法给出的保守性均较差。这些差异可能非常显着，特别是对于强度极限的预测；极限载荷，减振载荷和棘轮极限。还获得了明显更低且更少保守性的弹性跟踪因子。比较证明了在这种情况下线性匹配方法的优势。

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