Korean Journal of Computational Design and Engineering (한국CDE학회논문집)

Society for Computational Design and Engineering (한국CDE학회)
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Sizing Optimization of CFRP Lower Control Arm Considering Strength and Stiffness Conditions

강도 및 강성 조건을 고려한 탄소섬유강화플라스틱(CFRP) 로어 컨트롤 아암의 치수 최적설계

  • Lim, Juhee (School of Mechanical Engineering College, Yonsei University) ;
  • Doh, Jaehyeok (School of Mechanical Engineering College, Yonsei University) ;
  • Yoo, SangHyuk (School of Mechanical Engineering College, Yonsei University) ;
  • Kang, Ohsung (GM Korea Technical Center) ;
  • Kang, Keonwook (School of Mechanical Engineering College, Yonsei University) ;
  • Lee, Jongsoo (School of Mechanical Engineering College, Yonsei University)
  • Received : 2016.07.19
  • Accepted : 2016.08.24
  • Published : 2016.12.01
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Abstract

The necessity for environment-friendly material development has emerged in the recent automotive field due to stricter regulations on fuel economy and environmental concerns. Accordingly, the automotive industry is paying attention to carbon fiber reinforced plastic (CFRP) material with high strength and stiffness properties while the lightweight. In this study, we determine a shape of lower control arm (LCA) for maximizing the strength and stiffness by optimizing the thickness of each layer when the stacking angle is fixed due to the CFRP manufacturing problems. Composite materials are laminated in the order of $0^{\circ}$, $90^{\circ}$, $45^{\circ}$, and $-45^{\circ}$ with a symmetrical structure. For the approximate optimal design, we apply a sequential two-point diagonal quadratic approximate optimization (STDQAO) and use a process integrated design optimization (PIDO) code for this purpose. Based on the physical properties calculated within a predetermined range of laminate thickness, we perform the FEM analysis and verify whether it satisfies the load and stiffness conditions or not. These processes are repeated for successive improved objective function. Optimized CFRP LCA has the equivalent stiffness and strength with light weight structure when compared to conventional aluminum design.

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References

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