A novel numerical manifold method with derivative degrees of freedom and without linear dependence

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• 作者：Huo Fan^a ; ^b ; ^c ; ^d ; Hong Zheng^e ; Siming He^a ; ^b ; ^c ; ^{hsm_imde@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zhongming Jiang^f
• 关键词：Derivative degrees of freedom ; Continuous star point stress ; Stress post-processing ; Initial stress matrix ; Free expansion
• 刊名：Engineering Analysis with Boundary Elements
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：64
• 期：Complete
• 页码：19-37
• 全文大小：2754 K

文摘

A new high-order NMM is described in detail. The derivative degrees of freedom with physical meaning, which have been used in discontinuous deformation analysis (DDA), continue to be employed in the NMM. A new local displacement approximation, whose order is promoted, is suggested for the NMM. The local approximation makes the NMM get rid of the issue of the linear dependence (LD) and makes the NMM possess the substantive characteristic of a continuous stress field at the “star points”. An existing stress post-processing technology, which does not lead to a forfeit of the abovementioned essential characteristic, is reinvented to improve the stress accuracy of the displacement-based method. The recurrence formula of the initial stress matrix is also generalized and revised to adapt to the proposed NMM. Moreover, a simplified inhibition approach is presented to deal with the free expansion (FE) problem of manifold element. Several typical examples are given to demonstrate the effectiveness of the proposed NMM.