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STRAIN-BASED MODELS FOR DENT ASSESSMENT - A REVIEW

机译：应变评估基于应变的模型-综述

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摘要

The depth-based dent assessment criteria as required by various government regulations and industry codes have served the pipeline industry well by requiring pipeline operators to investigate dents with potentially severe deformational damage. However, the use of depth criterion alone can result in both unnecessary excavations and the mischaracterizing of otherwise severe dents. ASME B31.8-2003 and PHMSA IMP Rules for gas pipelines affecting high consequence areas offer an option for using strain-based criteria and B31.8 provides non-mandatory formulas for strain calculation. Due to complications in dent profile, other formulas in the open literature or those derived by qualified engineers are also allowed by the ASME code. The present paper reviews dent strain calculation methods that are currently available. Comparisons in the calculated strains between methods are made using several case studies. Discrepancies and their effect on the equivalent (or effective) strain are identified. Improvements and alternative strain limit approaches are explored and discussed.
机译：各种政府法规和行业法规要求的基于深度的凹痕评估标准通过要求管道运营商调查具有潜在严重变形损坏的凹痕，对管道行业起到了很好的作用。但是，仅使用深度判据会导致不必要的挖掘和其他严重凹痕的错误表征。影响严重后果区域的天然气管道的ASME B31.8-2003和PHMSA IMP规则为使用基于应变的标准提供了一种选择，而B31.8为应变计算提供了非强制性公式。由于凹痕轮廓的复杂性，ASME规范也允许使用公开文献中的其他公式或由合格工程师得出的公式。本文概述了当前可用的凹痕应变计算方法。使用几种案例研究对方法之间的计算菌株进行了比较。确定差异及其对等效（或有效）应变的影响。探索和讨论了改进方法和替代应变极限方法。

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