Computational modeling of crack-tip fields in transversely isotropic strain-limiting solids subjected to piecewise linear slope loads

Abstract

Crack-tip fields within a transversely isotropic strain-limiting elastic body are investigated under the influence of piecewise linear slope boundary loads. The mechanical response is characterized via a nonlinear constitutive framework relating the Cauchy stress to the linearized strain, by which non-physical strain singularities at the crack tip are eliminated. The governing system is formulated as a quasi-linear elliptic boundary value problem in terms of the displacement field and is solved utilizing a continuous Galerkin finite element method coupled with a Picard linearization scheme. Boundary conditions are prescribed such that the vertical displacement varies piecewise linearly along the top and bottom edges, exhibiting opposite slopes on each half of the boundary. Numerical results are derived for two distinct fiber orientations. It is demonstrated that piecewise slope loads provide a flexible and realistic configuration for elucidating the interplay between strain-limiting behavior and crack-tip mechanics in transversely isotropic media.