An extended finite element method (XFEM) for linear elastic fracture with smooth nodal stress

详细信息    查看全文

• 作者：X. Peng^a ; S. Kulasegaram^a ; S.C. Wu^b ; S.P.A. Bordas^a ; ^c ; ^d ; ^{stephane.bordas@alum.northwestern.edu}
• 关键词：Double-interpolation approximation ; Higher-order element ; Smooth nodal stress ; Extended finite element method ; Crack propagation
• 刊名：Computers & Structures
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：179
• 期：Complete
• 页码：48-63
• 全文大小：2571 K
• 卷排序：179

文摘

A nodal C1C1 approximation procedure combined with partition of unity enrichment has been constructed for fracture. The double-interpolation approximation improves the accuracy of the solution field by up to one order of magnitude with the same degrees of freedom as the constant strain triangular element. The double-interpolation approximation is able to calculate the stress at node directly through interpolation. The enriched form of the double-interpolation approximation enables a way to propagate the crack with minimal remeshing with a smoother crack tip stress field obtained.