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http://dx.doi.org/10.5139/JKSAS.2011.39.4.306

Damage Tolerance Analysis Using Surrogate Model  

Jang, Byung-Wook (한국항공대학교 대학원)
Im, Jae-Hyuk (한국항공우주연구원)
Park, Jung-Sun (한국항공대학교 항공우주 및 기계공학부)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.39, no.4, 2011 , pp. 306-313 More about this Journal
Abstract
The damage tolerance analysis is required to guarantee the structural safety and the reliability for aircraft components. The damage tolerance method, which evaluate the life considering the initial crack, considers a fatigue design model of the aircraft main structure. The fatigue crack growth life should be calculated in damage tolerance analysis and the inspection time to define the replacement cycle. In this paper, the damage tolerance analysis is performed for a turbine wheel which has complex geometry. The equation of the stress intensity factor for complex geometry is hard to know, so that they are usually processed by finite element analysis which takes long time. To solve this problem, the stress intensity factors at specified crack are obtained by the FEA and the crack growth life is evaluated using the surrogate model which is generated by the regression analysis of the FEA data. From the results, the efficiency of the crack growth life calculation and the damage tolerance analysis could be increased by taking the surrogate model.
Keywords
Damage Tolerance; Fatigue Life; Crack Growth; Stress Intensity Factor; Regression Analysis;
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