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In-plane and out-of-plane constraint effect on crack-front stress fields under creep conditions are
studied by means of three-dimensional numerical analyses of finite thickness boundary layer models and
different specimen geometries. This investigation is an extension of the modified boundary layer solution
developed by Shlyannikov et al. in 2011 with special attention on constraint parameters of the nonlinear cracktip
fields for a solid of finite thickness. Characterization of constraint effects is given by using the non-singular
T-stress, the local triaxiality parameter, the -factor of the stress-state in 3D cracked body and the second order
term amplitude factor. The constraint parameters are determined for a center cracked plate, three-point bend
specimen and compact tension specimen. Discrepancies in constraint parameters distribution along crack front
towards thickness of the specimens have been observed under different loading conditions of creeping power
law hardening material for various configurations of specimens.