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Shape Optimization of Thermoelastic Structures for Durability
Choi, Kyung Kook,Grindeanu, Iulian,Chang, Kuang Hua 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
A shape design sensitivity analysis and optimization methodology for the fatigue life of the thermoelastic structural components is developed in this research. Crack initiation life prediction is based on the multiaxial fatigue life prediction method and is modeled using constant amplitude strain-life data and cyclic stress-strain curves. An hybrid design sensitivity analysis method is developed for the fatigue life. The sensitivity of dynamic stress and the sensitivity of the temperature field are obtained using an analytical approach, and are employed further to predict dynamic stress and temperature increments due to design changes. Using these predicted stresses and temperatures, the fatigue life of the component at the perturbed design is also predicted. The predicted fatigue life is then used to obtain the design sensitivity of the fatigue life by utilizing the finite difference method. The proposed design sensitivity analysis method is applied to support design optimization of the exhaust manifold that is provided by an automotive company, considering crack initiation lives as design constraints.