Fluid-structure-fracture coupling 1D model for unstable ductile fracture in high-pressure gas pipelines -development of model (1st report)-

被引：0
|
作者：
Nakai H. [1 ]
Miyamoto K. [1 ]
Misawa K. [1 ,2 ]
Imai Y. [1 ,3 ]
Aihara S. [1 ]
机构：
[1] School of Engineering, The University of Tokyo
[2] Tokyo Gas Co., Ltd
来源：
Transactions of the Japan Society for Computational Engineering and Science | 2016年 / 2016卷
关键词：
Coupling model; Finite difference method; Fracture mechanics; Pipeline; Unstable ductile crack;
D O I：
10.11421/jsces.2016.20160003
中图分类号：
学科分类号：
摘要：
Prevention of unstable ductile crack propagation is one of crucial issues in pipeline industry. Unstable ductile crack propagation in pipelines is complex coupling phenomenon among gas decompression inside pipelines, pipe deformation and crack propagation. Therefore, numerical methods are highly valuable for safety design against unstable ductile crack propagation. In this study, uid-structure-fracture coupling 1D model for unstable ductile fracture in high-pressure gas pipelines was developed. The model describes gas decompression and pipe deformation by 1D partial differential equations, and judges whether or not a crack propagates using dynamic energy balance. Effect of soil backfill which constrains pipe deformation is formulated as added mass on a pipe wall. Because 1D partial differential equations in the model is solved by finite difference method, the model consumes lower CPU cost as compared to 3D finite element based model. Therefore, the model has a potential as a tool of pipeline design. © 2016 by the Japan Society for Computational Engineering and Science.
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