Free vibration of composite beams featuring interlaminar bonding imperfections and exposed to thermomechanical loading

摘要

In this paper, the implications played by siding imperfections on the static response, buckling and free vibration behavior and on the frequency-load-temperature interaction of simply-supported laminated plates in cylindrical bending are investigated and pertinent conclusions outlined. To this end, a recently developed theory for mutilayered beam-plates with slightly weakened interfaces, which fulfils (i) the shear traction continuity requirements at the interfaces, (ii) the free-shear condition at the upper and lower surfaces and (iii) incorporates the effect of imperfect bounding by featuring the presence of interlayer jumps of tangent displacements, is used. Within this framework, a number of numerical results by a closed-form approach, relative to symmetric and unsymmetrical lamination schemes and various length-to-thickness ratios are supplied which illustrates the effects of the interfacial weakness. The obtained results reveal the detrimental effects induced by the bonding flaws upon eighenfrequencies, which appear the most sensitive, buckling loads and deflections.