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首页> 外文会议>ASME international pipeline conference 2008 >A FAD-BASED PROCEDURE FOR DEFECT ASSESSMENTS OF WELDED STRUCTURES INCLUDING EFFECTS OF WELD STRENGTH MISMATCH: MICROMECHANICS APPROACH AND APPLICATION TO PIPELINE GIRTH WELDS
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A FAD-BASED PROCEDURE FOR DEFECT ASSESSMENTS OF WELDED STRUCTURES INCLUDING EFFECTS OF WELD STRENGTH MISMATCH: MICROMECHANICS APPROACH AND APPLICATION TO PIPELINE GIRTH WELDS

机译：一种基于FAD的焊接结构缺陷评估方法，包括焊接强度不匹配的影响：微力学方法及其在管道周长焊缝中的应用

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摘要

ECA procedures of crack-like defects based upon the FAD philosophy have undergone extensive developments in the past decade to form the basis for industrial codes and guidelines for structural integrity assessments. However, the application of these procedures in welded structural components with mismatch in tensile properties between the weld and base metal remains a potential open issue. Weld strength mismatch may significantly alter the crack-tip driving forces, such as J and CTOD, thereby producing crack-tip stresses quite different than the fields that arise in corresponding homogeneous material. Weld strength mismatch also affects the plastic collapse load for the structural component which further complicates the interplay between fracture and plastic instability before gross yield section takes place. This work describes the development of a microme-chanics-based FAD methodology building upon a local fracture parameter, characterized by the Weibull stress (σ_w), to incorporate the effects of weld strength mismatch on crack-tip driving forces. As a further refinement, the study also addresses an exploratory application of a limit load analysis including effects of weld strength mismatch to correct the loading trajectory incorporated into the FAD procedure. Fracture testing of girth welds obtained from an API X80 pipeline steel provide the data needed to validate the proposed modified FAD procedure in failure predictions. Such an application serves as a prototype for a wide class of integrity assessment problems involving the effects of weld strength mismatch.
机译：在过去的十年中，基于FAD原理的ECA类裂纹缺陷的ECA程序得到了广泛的发展，从而为工业规范和结构完整性评估指南奠定了基础。但是，在焊接结构和母材之间拉伸性能不匹配的焊接结构部件中应用这些程序仍然是一个潜在的未解决的问题。焊接强度不匹配可能会显着改变裂纹尖端的驱动力，例如J和CTOD，从而产生的裂纹尖端应力与相应的均质材料中产生的磁场完全不同。焊接强度不匹配还会影响结构部件的塑性塌陷载荷，这进一步使断裂和塑性失稳之间的相互作用复杂化，直到发生总屈服截面。这项工作描述了基于微力学的FAD方法的开发，该方法建立在以Weibull应力（σ_w）为特征的局部断裂参数的基础上，以结合焊接强度不匹配对裂纹尖端驱动力的影响。作为进一步的改进，该研究还探讨了极限载荷分析的探索性应用，包括焊接强度不匹配的影响，以校正FAD程序中包含的载荷轨迹。从API X80管线钢获得的环缝焊缝的断裂测试提供了在失效预测中验证拟议的改进FAD程序所需的数据。这种应用程序可作为涉及焊接强度不匹配影响的各种完整性评估问题的原型。

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  • 会议地点 Calgary(CA);Calgary(CA);Calgary(CA)
  • 作者

    Gustavo H. B. Donato; Claudio Ruggieri;

  • 作者单位

    Graduate Student at Polytechnic School University of Sao Paulo Sao Paulo, SP 05508-900, Brazil;

    Dept. of Naval Architecture and Ocean Engineering University of Sao Paulo Sao Paulo, SP 05508-900, Brazil;

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  • 正文语种 eng
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