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http://dx.doi.org/10.7734/COSEIK.2018.31.2.97

Fatigue Constrained Topological Structure Design Considering the Stress Correction Factor  

Kim, Daehoon (Graduate school of Mechanical Engineering, Yonsei Univ.)
Ahn, Kisoo (Graduate school of Mechanical Engineering, Yonsei Univ.)
Jeong, Seunghwan (Graduate school of Mechanical Engineering, Yonsei Univ.)
Park, Soonok (Department of Engineering Automotive, Dong Seoul Univ.)
Yoo, Jeonghoon (Department of Mechanical Engineering, Yonsei Univ.)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.31, no.2, 2018 , pp. 97-104 More about this Journal
Abstract
In this study, a structure satisfying the fatigue constraint is designed by applying the topology optimization based on the phase field design method. In order to predict life based on the stress value, high cycle fatigue failure theory in which stress acts within the range of elastic limit is discussed and three fatigue theories of modified-Goodman, Smith-Watson-Topper and Gerber theory are applied. To calculate the global maximum stress, a modified P-norm stress correction method is used. As a result, it is possible to obtain topology optimization results that minimize the volume while satisfying the fatigue constraints. By applying the phase field design method, a simple shape with a minimized gray scale was obtained, and the maximum stress value acting on the optimization result became very close to the allowable stress value due to the modified P-norm stress method. While previous studies does not consider the stress correction factor, this study proposes the determination method regarding the stress correction factor considering loading effects related to axial stress components.
Keywords
phase field design method; fatigue failure constraint; modified P-norm stress; lightweight design; stress correction factor;
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