Constraint Based Assessments of Large-Scale Cracked Straight Pipes and Elbows
Constraint Based Assessments of Large-Scale Cracked Straight Pipes and Elbows
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DOI：
10.1115/pvp2015-45948
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
M. Gintalas;R. Ainsworth
中科院分区：
文献类型：
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作者：
M. Gintalas;R. Ainsworth
本文提出了t应力解的发展特征约束水平在大型裂纹管道和弯头。管道和弯头的应力强度系数（KI）通过材料断裂韧性归一化，以定义适合使用程序（如R6）中的Kr参数。增加关于t应力水平的知识可以通过规范化约束参数βT进行更高级的分析。本文对6根管道和8个弯头进行了分析。在实验测量的裂纹起裂点处，计算了每个管道和弯头的归一化约束参数βT的值。将管道和弯头的约束水平与不同类型断裂韧性试样的约束水平进行比较，利用R6方法预测起裂载荷，并为可转移性提供指导。ASME版权所有©2015
The paper presents T-stress solutions developed to characterize constraint levels in large-scale cracked pipes and elbows. Stress intensity factor, KI, solutions for pipes and elbows are normalised by material fracture toughness to define the Kr parameter in fitness-for-service procedures, such as R6. Adding knowledge on levels of T-stress allows more advanced analysis through a normalised constraint parameter βT.The paper presents analyses for 6 pipes and 8 elbows. Values of the normalised constraint parameter βT are calculated for each pipe and elbow at the experimentally measured crack initiation point. Comparison of constraint levels in the pipes and elbows with those in various types of fracture toughness specimen are used to predict the initiation loads using the R6 method and to provide guidelines for transferability.Copyright © 2015 by ASME