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首页> 外文会议>4th International Pipeline Conference, Sep 30-Oct 3, 2002, Calgary >A PRELIMINARY STRAIN-BASED DESIGN CRITERION FOR PIPELINE GIRTH WELDS
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A PRELIMINARY STRAIN-BASED DESIGN CRITERION FOR PIPELINE GIRTH WELDS

机译：管道周长焊缝的基于应变的初步设计准则

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摘要

The strain capacity of girth welds containing surface-breaking welding defects is examined through numerical analysis and experimental verification under a PRCI (Pipeline Research Council International) funded project. Some important insights on the various factors affecting the girth weld strain capacity are generated. The defect size is identified as one of the most important factors in determining strain capacity of a girth weld. Other factors, such as the strain hardening rate of the pipe and weld metals, weld strength mismatch, fracture toughness, and weld cap height, can play a significant role if the defect size is within certain limits. It is discovered that the girth weld response to the remotely applied strain may be characterized by a three-region diagram. For a given set of defect size and weld strength mismatch conditions, the crack driving force may be bounded, unbounded, or gradually changing, with respect to the remotely applied strain. A set of parametric equations is developed that allow the computation of allowable strains with the input of defect depth, defect length, CTOD toughness, and weld strength mismatch. The comparison of the developed strain criteria with full-scale bend tests and tensile-loaded CWPs (curved wide plates) shows the criteria are almost always conservative if lower bound CTOD toughness for a given set of welds is used. However, the criteria can significantly underpredict strain capacity of girth welds with short defects. Although defect length correction factors were added to the strain criteria based on the comparison of axisymmetric finite element (FE) results and full-scale bend test results, a more thorough investigation of the effects of defect length on strain capacity is needed. Future investigation that incorporates the finite length defects is expected to greatly reduce the underprediction. The influence of other factors, such as strain hardening rate, should be further quantified.
机译：在PRCI（国际管道研究理事会）资助的项目下，通过数值分析和实验验证来检验包含表面断裂焊接缺陷的环焊缝的应变能力。产生了影响环焊缝应变能力的各种因素的重要见解。缺陷尺寸被确定为确定环缝焊缝应变能力的最重要因素之一。如果缺陷尺寸在一定范围内，则其他因素（例如，管道和焊缝金属的应变硬化率，焊缝强度不匹配，断裂韧性和焊缝高度）也可以发挥重要作用。已经发现，环焊缝对远程施加应变的响应可以通过三区域图来表征。对于给定的一组缺陷尺寸和焊接强度失配条件，相对于远程施加的应变，裂纹驱动力可能是有界的，无界的或逐渐变化的。开发了一组参数方程，可以通过输入缺陷深度，缺陷长度，CTOD韧性和焊接强度失配来计算允许应变。将已开发的应变标准与全尺寸弯曲试验和拉伸加载的CWP（弯曲的宽板）进行比较，表明如果使用给定焊缝的下限CTOD韧性，则该标准几乎总是保守的。但是，该标准可能会严重低估具有短缺陷的环焊缝的应变能力。尽管基于轴对称有限元（FE）结果与全尺寸弯曲测试结果的比较将缺陷长度校正因子添加到应变准则中，但仍需要更彻底地研究缺陷长度对应变能力的影响。结合有限长度缺陷的未来研究有望大大减少预测不足。应进一步量化其他因素的影响，例如应变硬化率。

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