The decay of end perturbations imposed on a rectangular plate subjected to compression is investigated in the context of plane-strain incremental finite elasticity. A separation of variables in the eigenfunction formulation is used for the perturbed field within the plate. Numerical results for the leading decay exponent are given for compressible foamed rubber modeled by hyperelastic Blatz-Ko material. It was found that the lowest decay rate is governed by a symmetric field that exposes relatively low sensitivity to compressive strain in a low regime of pre-strain. Under such circumstances, the values for decay rate obtained from linear elastic analysis can be considered as a good approximation for a slightly compressed plate. For higher compressive pre-strain levels, the decay distance increases significantly. Along with decaying modes representing end effects, the eigenfunction expansion generates a non-decaying anti-symmetric mode corresponding to buckling of the plate. It is remarkable that asymptotic expansion of that non-decaying mode predicts buckling according to the classical Euler formula.
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