RESEARCH PAPERS: Design Theory and Methodology

Shape Design Optimization of Thermoelastic Structures for Durability

[+] Author and Article Information
I. Grindeanu

Center for Computer-Aided Design, College of Engineering, The University of Iowa, Iowa City, IA 52245

K. K. Choi

Department of Mechanical Engineering and Center for Computer-Aided Design, College of Engineering, The University of Iowa, Iowa City, IA 52245

K.-H. Chang

School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019

J. Mech. Des 120(3), 491-500 (Sep 01, 1998) (10 pages) doi:10.1115/1.2829178 History: Received March 01, 1998; Revised June 01, 1998; Online December 11, 2007


Shape design sensitivity analysis (DSA) and optimization methods for the fatigue life of thermoelastic structural components are presented in this paper. A multiaxial fatigue life prediction method is used for crack initiation. The crack initiation life prediction is modeled using constant amplitude strain-life data and cyclic stress-strain curves. A hybrid DSA method is used for the fatigue life. The design sensitivities of the dynamic stress and the temperature field are obtained using analytical approaches. The design sensitivity is used to predict the dynamic stress and temperature of the perturbed design. Using predicted stress and temperature, the fatigue life of the perturbed structural design component is 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 DSA method is applied to design optimization of an automotive exhaust manifold of an automotive vehicle, considering crack initiation lives as design constraints.

Copyright © 1998 by The American Society of Mechanical Engineers
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