Analytical solution for limit load of orthotropic pressure pipe with internal circumferential crack

Analytical solution for limit load of orthotropic pressure pipe with internal circumferential crack
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内周裂纹正交各向异性压力管极限载荷解析解

DOI:
10.1016/j.ijmecsci.2018.09.002
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发表时间:
2018-12
影响因子:
7.3
通讯作者:
Xiao-Hua He
Xiao-Hua He
中科院分区:
工程技术1区
文献类型:
--
作者:
Qin Yu;Chang-Yu Zhou;Zi-Wen Wang;Xiao-Hua He

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基于希尔屈服准则,考虑压力管道的三向应力(r,θ,z),推导了含等深度环向裂纹的正交异性压力管道在压力、轴力和弯曲共同作用下的极限载荷解析解。讨论了裂纹尺寸、管材各向异性、载荷(压力、弯矩)和管子尺寸对正交异性压力管道极限载荷的影响。结果表明,对于厚壁管道,需要考虑三向应力,而对于厚壁管道,径向应力对极限载荷的影响是不能忽略的。等深度内周向裂纹管道的极限载荷随裂纹尺寸的增大而减小。管道在纯弯曲作用下的极限载荷只与轴向屈服强度有关。管道在纯内压作用下的极限载荷主要由周向屈服强度决定。
Based on the Hill yield criterion, considering three directional stress (r, θ,z) of pressure pipe, the analytical solution for limit load of orthotropic pressure pipe with constant-depth internal circumferential crack under combined pressure, axial force and bending has been derived. The effect of crack size, anisotropy of pipe material, load (pressure, moment), and pipe size on the limit load of orthotropic pressure pipe is discussed. The results show that it is necessary to consider three directional stress for thick-walled pipe, and the influence of radial stress on the limit load cannot be ignored for thick-walled pipe. The limit load of pipe with constant-depth internal circumferential crack decreases with crack size. The limit load of pipe under pure bending is only related to axial yield strength. The limit load of pipe under pure internal pressure is mainly determined by circumferential yield strength.
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