Abstract：Metallic thin-walled structures subjected to thermal-acoustic loadings will exhibit complex nonlinear response. Fast alternating complex stresses in structures can decrease the fatigue life seriously. Based on the nonlinear thermal-acoustic response analysis, the rain flow cycle counting (RFC) method is used to calculate the number of fatigue cycles. Then the Miner accumulative damage model is employed in conjunction with various mean stress models, including Morrow TFS with true fracture strength, SWT, to predict the high cycle fatigue life. The nonlinear responses of 2024-T3 aluminum plate are obtained under band-limited Gaussian white noise loadings with pre/post-buckled temperature loadings, and the fatigue life is estimated. Analytical results show that the fatigue life of pre-buckled plate decreases with the increase of temperature, keeps going down to the lowest undergoing persistent snap-through at the post-buckled region, and then goes up after entering intermittent snap-through region, which indicate that there exists a specific relationship between the thermal-acoustic fatigue life and nonlinear response behaviors.
2013, Vol. 32 
