The free vibrations of cantilevered aluminium alloy beams and plates of 5mm thickness and of length-to-breadth ratios ranging from a ratio of 10 for a beam down to a ratio of 0.25 for a plate were analysed by means of the finite element (FE) method. The analysis was carried out using the ABAQUS FE programme. For each ratio, a total of 20 natural frequencies and mode shapes were predicted. The obje4ctive of the paper was to demonstrate that a transition zone for beam-like to plate-like behaviour of structural components can be approximately defined for various lengthwise mode counters.
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