Abstract
A finite element model is presented for the determination of plastic zone and Mouth Opening Displacement (MOD) values of an edge cracked thin mild steel plate. Singularity effects near the crack tip are solved by introducing 12 node cubic isoparametric elements in the crack tip region by collapsing into triangular elements. The initiation and expansion of the plastic zone is obtained by applying stepped nominal stresses of a tensile nature transverse to the crack length. The MOD values obtained by FEM are comparable with the values obtained experimentally. The stress intensity factors computed by this model are within 2–6% of the Westergaard solution.
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