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http://dx.doi.org/10.3795/KSME-A.2008.32.12.1132

Local Shape Optimization of Notches in Airframe for Fatigue-Life Extension  

Won, Jun-Ho (한국항공대학교 항공우주 및 기계공학과)
Choi, Joo-Ho (한국항공대학교 항공우주 및 기계공학부)
Gang, Jin-Hyuk (한국항공대학교 항공우주 및 기계공학과)
An, Da-Wn (한국항공대학교 항공우주 및 기계공학과)
Yoon, Gi-Jun (한국항공대학교 항공우주 및 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.32, no.12, 2008 , pp. 1132-1139 More about this Journal
Abstract
The aim of this study is to apply shape optimization technique for the repair of aging airframe components, which may extend fatigue life substantially. Free-form optimum shapes of a cracked part to be reworked or replaced are investigated with the objective to minimize the peak local stress concentration or fatigue-damage. Iterative non-gradient method, which is based on an analogy with biological growth, is employed by incorporating the robust optimization method to take account of the stochastic nature of the loading conditions. Numerical examples of optimal hole shape in a flat plate are presented to validate the proposed method. The method is then applied to determine the reworked or replacement shape for the repair of a cracked rib in the rear assembly wing body of aircraft.
Keywords
Shape Optimization; Non-Gradient Optimization; Fatigue-Life; Airframe; Stress Concentration; Robust Optimization;
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Times Cited By KSCI : 1  (Citation Analysis)
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