FREQUENCY-LOAD INTERACTION OF GEOMETRICALLY IMPERFECT CURVED PANELS SUBJECTED TO HEATING

The results of a parametric study of the vibration behavior of flat an d shallow curved panels subjected to temperature fields and mechanical loads are presented, The mechanical loads include uniform axial-compr ession prebuckling loads and transverse lateral pressure. The temperat ure fields include spatially nonuniform heating over the panel surface s and a linear through-the-thickness temperature gradient. The structu ral analysis used for the study is based on a higher order transverse- shear-deformation shallow-shell theory that includes the effects of ge ometric nonlinearities and initial geometric imperfections. Analytical results are presented for simply supported single-layer and three-lay er panels made from transversely isotropic materials. The results iden tify the interaction of the applied thermal and mechanical loads with the fundamental frequencies in both the prebuckling and postbuckling e quilibrium states. The results indicate that initial geometric imperfe ctions, transverse-shear flexibility, and changes in curvature are imp ortant contributors to the response of a panel for a wide range of str uctural and loading parameters.