AXISYMMETRICAL STRAINING MODES IN THE VIBRATION OF CIRCULAR PLATES

Axisymmetric straining modes, which are different from the axisymmetri c flexural modes of vibrating circular plates and cannot be revealed b y conventional plate theory-based approaches, are investigated in the present study. Mode shapes of an example problem with clamped and four different simply-supported boundary conditions are presented to show what straining modes may look like. The straining modes are classified into three types and a criterion is set up to predict the appearance of straining modes. Some observations about straining modes are obtain ed and discussions are made. Results for different Poisson ratios are also shown. (C) 1997 Academic Press Limited.