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论文类型：期刊论文

发表时间：2015-07-01

发表刊物：EUROPEAN JOURNAL OF MECHANICS A-SOLIDS

收录刊物：SCIE、EI、Scopus

卷号：52

页面范围：12-25

ISSN号：0997-7538

关键字：Symplectic approach; Linear viscoelasticity; Mixed-mode crack

摘要：In this paper, an analytical approach is developed for the fracture analysis of linear viscoelastic media. By the Laplace transform, the governing equations for the time domain (t-domain) are changed into frequency domain (s-domain). Then, a Hamiltonian system is established by introducing the dual variables of displacements and energy variational principle. In the framework of symplectic mathematics, the unknown vector consisting of displacements and stresses is expanded in terms of symplectic eigensolutions whose coefficients can be determined from the outer boundary conditions. Then t-domain solution is finally obtained by inverse Laplace transform and exact forms of fracture parameters including stress intensity factor (SIF) and J-integral are derived simultaneously. Numerical examples are provided to verify the validity of the present method. A parametric study of viscoelastic parameters and outer boundary conditions is carried out also. (C) 2015 Elsevier Masson SAS. All rights reserved.