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Postbuckling failure mechanism of square aluminum plates under shear loading

Buckling is very important for structural design, especially when the structure is thinwalled. Slender plates are widely used as structural members in civil, naval and aerospace engineering and they are able to carry considerable additional loads in the postbuckling range. Engineers take advantage of this postbuckling reserve and design structures that are allowed to buckle and operate below their ultimate loads for further weight and cost reduction [1]. Consequently, both buckling and postbuckling behavior of slender plates are of critical importance during the design of lightweight thin-walled engineering structures. It is known that an elastic flat plate subjected to increasing in-plane compressive loading beyond its primary buckling may snap to another equilibrium state of a different deflection mode. This phenomenon is called secondary buckling of rectangular plates [2].The design of postbuckling structures must include the capability of predicting when secondary buckling occurs, since it is often combined with abrupt mode-shape jump which may give rise to fatigue problems and other degradation factors. The present numerical study deals with the buckling and postbuckling response of square aluminum simply supported plates subjected to shearing stresses. More specifically, the main objective is the investigation of the failure mechanism of thin plates with different slenderness ratio, taking into account yielding and secondary buckling, which is located using a novel Finite Element Modeling (FEM) procedure.