Dynamic buckling of Fiber Metal Laminate Structure

The dynamic buckling phenomenon of hybrid multilayer Fiber Metal Laminate structure was presented. The analysis was performed on short thin-walled channel section columns subjected to axial compressive impulse loading. The dynamic buckling investigation was carried out numerically using the Finite Element Method. Three samples differentiate in the laminate stacking sequence were considered. The analysis of dynamic buckling phenomena was performed using both geometric criteria and failure criteria. This approach allows getting to know the behaviour of the multilayer FML structure under pulse loading. The effect of initial geometric imperfection, laminate stacking sequence and the shape of the pulse load on the dynamic stability was also analysed. Results depicted the lowest resistance of the investigated channel FML columns to the rectangular-shaped pulse loading and the lowest one - for the columns subjected to triangular-shaped pulse load. Three analysed profiles, varying in GFRP stacking sequences, presented similar behaviour under pulse compressive loading. The parametric analysis reveals the yielding of the aluminium outer layers as a dominant failure mechanism in FML composite.