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首页> 外文会议>Proceedings of the 28th international conference on ocean, offshore and arctic engineering 2009 >SIMULATIONS OF DUCTILE TEARING AT LARGE STRAINS OF BIAXIALLY LOADED PIPES
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SIMULATIONS OF DUCTILE TEARING AT LARGE STRAINS OF BIAXIALLY LOADED PIPES

机译：双轴加载管大应变下的韧性断裂模拟

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摘要

The purpose of the present paper is to present results from analyses of ductile tearing of biaxially loaded pipes subjected to large scale yielding. The paper deals with three dimensional finite element modelling of pipes with a circumferentially orientated surface crack, where the analyses aim to reproduce the crack propagation behaviour of six full scale bend tests of x-65 seamless pipes with different levels of internal overpressure. The tests were performed as a part of the joint industry project Fracture Control - Offshore Pipelines. Ductile tearing is taken into account by using the Gurson-Tvergaard-Needleman formulation, where calibration of the material model parameters is done by reproducing the fracture toughness test of a SENT-specimen of the same material with finite element modelling. The following simulations of the pipes show a good correspondence with the full scale test results, where both the global response and the ductile tearing from the crack are captured. One important result of the study is that the Gurson-Tvergaard-Needleman parameters that were calibrated against the SENT-specimen could successfully be used for the ductile tearing simulation of the full scale pipes.
机译：本文的目的是提出分析双轴加载管道在大规模屈服下的韧性断裂的结果。本文研究了具有圆周方向表面裂纹的管道的三维有限元建模，其中的分析旨在再现具有不同内部超压水平的x-65无缝管道的六个全尺寸弯曲试验的裂纹扩展行为。测试是联合行业项目“裂缝控制-离岸管道”的一部分。通过使用Gurson-Tvergaard-Needleman公式考虑了延性撕裂，其中材料模型参数的校准是通过使用有限元建模再现相同材料的SENT试样的断裂韧性测试来完成的。以下管道模拟显示了与全尺寸测试结果的良好对应性，其中同时捕获了整体响应和裂纹的延性撕裂。该研究的重要结果之一是，针对SENT标本校准的Gurson-Tvergaard-Needleman参数可以成功地用于全尺寸管道的延性撕裂模拟。

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