T-stress in orthotropic functionally graded materials: Lekhnitskii and Stroh formalisms

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Symmetric Galerkin boundary element computation of T-stress and stress intensity factors for mixed-mode cracks by the interaction integral method (2004, background): “They have also extended the two-state integral approach to evaluate T-stress in isotropic [35,36] and orthotopic [37] FGMs.”
XFEM fracture analysis of orthotropic functionally graded materials (2013, unknown): “while r ? 0, the term rijsijkl;1ðxÞr kl vanishes and can be written [63] rij u i;1j e ij;1 r!0 rij sijklðxÞ s ijkl r kl;1 ð67Þ”
An interaction integral method for 3D curved cracks in nonhomogeneous materials with complex interfaces (2010, background): “According to a series of investigations (Kim and Paulino, 2003, 2004, 2005), Kim and Paulino gave a systemical summary on three definitions of the auxiliary fields and discussed how to extract mixed-mode SIFs and Tstress of 2D cracks in isotropic and orthotropic FGMs.”