Large-Amplitude Plate Vibration in an Elevated Thermal Environment
Final rept. May-Dec 1991
WRIGHT LAB WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
At elevated temperatures the dynamics of vibrating plate or shell must include the three thermal effects 1 the global expansion that is due to uniform plate temperature, 2 the local expansion by temperature variation over the plate, and 3 the thermal moment induced by temperature gradient across the plate thickness. Using the single-mode model of Galerkin representation, we have shown that 1 and 2 give rise to the combined stiffness responsible for thermal buckling, whereas 3 contributes to the combined forcing of thermal and mechanical excitations. Anticipating the high-temperature sonic fatigue test facility being fabricated at the structural dynamics Branch WLFIBG in support of NASP program, the present study attempts to estimate the mean square displacement and root-mean-square stress and strain components by using the equivalent linearization technique of stochastic dynamics.