Localization and shear-crippling (kinkband) instability in a thick imperfect laminated composite ring under hydrostatic pressure (Q1434667)

The authors present a fully nonlinear analysis for prediction of localization representing shear-crippling (kinkband) instability in a thick laminated composite (plane strain) ring. The analysis accounts for both material (hypoelastic behavior) and geometric nonlinearities, the later incorporating the completely nonlinear strain-displacement relations, in contrast to the commonly used von Kármán type nonlinear approximation. The fully nonlinear kinematic relations are employed, so that stable and unstable equilibrium paths in the advanced nonlinear regime can be accurately predicted. To investigate a localization of the buckling pattern, a local or dimple shaped imperfection superimposed on a fixed modal one is used.