管道内表面裂纹角度对裂纹扩展的影响分析
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摘要
压力管道内表面裂纹的扩展是管道断裂失效的主要形式之一。以AP1000型核电站一回路主管道为例,利用扩展有限元法(XFEM)建立了内压作用下的管道内表面裂纹扩展模型,分析了不同角度内表面裂纹的扩展情况。结果显示,裂纹扩展速率与内表面裂纹和管道轴线方向的夹角有很大的关系,夹角在30°~60°间更易形成穿透裂纹。
The crack propagation in the inner surface of the pressure pipe is one of the main forms of pipe fracture failure.Taking the primary circuit main pipeline of AP1000 nuclear power station as an example, the crack propagation model of the inner surface of the pipe was established by XFEM model. The propagation situation of the inner surface crack from different angles was analyzed. The results show that the crack growth rate has a close relationship with the angle between inner surface crack and axial direction of the pipe, and the penetrated crack is more easily formed at an angle between 30° to 60°
The crack propagation in the inner surface of the pressure pipe is one of the main forms of pipe fracture failure.Taking the primary circuit main pipeline of AP1000 nuclear power station as an example, the crack propagation model of the inner surface of the pipe was established by XFEM model. The propagation situation of the inner surface crack from different angles was analyzed. The results show that the crack growth rate has a close relationship with the angle between inner surface crack and axial direction of the pipe, and the penetrated crack is more easily formed at an angle between 30° to 60°
引文
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[4]杨庆生,杨卫.断裂过程的有限元模拟[J].计算力学学报,1997(4):33-38.
[5]刘光廷,涂金良,张镜剑.位移不连续边界元法解多裂纹体的裂缝扩展[J].清华大学学报:自然科学版,1996(1):59-64.
[6]Sukumar N,Prévost J H.Modeling quasi-static crack growth with the extended finite element method Part I:Computer implementation[J].International Journal of Solids&Structures,2003,40(26):7513-7537.
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[8]李录贤,王铁军.扩展有限元法(XFEM)及其应用[J].力学进展,2005(1):5-20.
[9]Melenk J M,Babu s姚ka I.The partition of unity finite element method:basic theory and applications[J].Computer Methods in Applied Mechanics&Engineering,1996,139(1/4):289-314.
[10]Sethian J A.Level set methods and fast marching methods:evolving interfaces in computational geometry[M].UK:Cambridge University Press,1999:239-248.
[11]王鹏,杨滨,王胜龙,等.AP1000主管道冷弯壁厚减薄[J].工程科学学报,2016(8):1160-1167.
[12]龚怒.AP1000核电安全端结构几何和异种金属材料性能失配对安全评定的影响[D].上海:华东理工大学,2012.
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