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首页> 外文期刊>International Journal of Offshore and Polar Engineers >Strain-based Design-Advances in Prediction Methods of Tensile Strain Capacity
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Strain-based Design-Advances in Prediction Methods of Tensile Strain Capacity

机译：应变能力预测方法中基于应变的设计进展

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In recent years, ExxonMobil has undertaken a comprehensive experimental and numerical program to characterize tensile strain capacity of welded pipelines under different operational, geometric and material property conditions. Key parameters affecting tensile strain capacity have been identified through sensitivity studies and used in a large-scale FEA-based parametric study to develop closed-form tensile strain capacity equations for different limit states. A key parameter affecting tensile strain capacity of welded pipelines is the tearing resistance (CTOD R-curve). Small-scale testing techniques have been developed to characterize the tearing resistance (R-curve) of full-scale pipelines using single edge notched tension (SENT) specimens. Experimental and numerical results have shown that the SENT R-curves closely match the full-scale test R-curves. The generalized tensile strain capacity equations have been validated against 20 full-scale tests for pipe grades X65 to X80 grades. The equations correctly predict the observed failure mode in the full-scale tests as well as the tensile strain capacity. Simplified, conservative tensile strain capacity equations with fewer parameters have been developed by making reasonable assumptions for several key parameters. The generalized and simplified tensile strain capacity equations can form the basis of a multi-tier engineering critical assessment (ECA) procedure for strain-based design of welded pipelines.
机译：近年来，埃克森美孚公司进行了全面的实验和数值程序，以表征在不同操作，几何和材料性能条件下焊接管道的拉伸应变能力。已经通过敏感性研究确定了影响拉伸应变能力的关键参数，并将其用于基于FEA的大规模参数研究中，以针对不同极限状态开发闭合形式的拉伸应变能力方程。影响焊接管道拉伸应变能力的关键参数是抗撕裂性（CTOD R曲线）。已经开发出小规模的测试技术，以使用单边缺口拉力（SENT）标本表征全尺寸管道的抗撕裂性（R曲线）。实验和数值结果表明，SENT R曲线与满量程测试R曲线非常匹配。对于20级的X65至X80级管道，已针对20个全面测试验证了通用的拉伸应变能力方程。这些方程式可以正确预测在满量程测试中观察到的失效模式以及拉伸应变能力。通过对几个关键参数进行合理假设，已经开发出了具有较少参数的简化的，保守的拉伸应变能力方程。广义和简化的拉伸应变能力方程式可以构成多层工程临界评估（ECA）程序的基础，用于基于应力的焊接管道设计。

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