Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Experimental Validation of Topology Design Optimization Considering Lamination Direction of Three-dimensional Printing

3D 프린팅 적층 방향을 고려한 위상최적설계의 실험적 검증

  • Park, Hee-Man (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Lee, Gyu-Bin (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Kim, Jin-san (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Seon, Chae-Rim (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Yoon, Minho (Department of Mechanical Engineering, Kumoh National Institute of Technology)
  • 박희만 (금오공과대학교 기계공학과) ;
  • 이규빈 (금오공과대학교 기계공학과) ;
  • 김진산 (금오공과대학교 기계공학과) ;
  • 선채림 (금오공과대학교 기계공학과) ;
  • 윤민호 (금오공과대학교 기계공학과)
  • Received : 2022.04.27
  • Accepted : 2022.05.09
  • Published : 2022.06.30
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Abstract

In this study, the anisotropic mechanical property of fused deposition modeling three-dimensional (3D) printing based on lamination direction was verified by a tensile test. Moreover, the property was applied to solid isotropic materials with penalization-based topology optimization. The case of the lower control arm, one of the automotive suspension components, was considered as a benchmark problem. The optimal topological results varied depending on the external load and anisotropic property. Based on these results, two test specimens were fabricated by varying the lamination direction of 3D printing; a tensile test utilizing 3D non-contact strain gauge was also conducted. The measured strain was compared with that obtained by computer-aided engineering response analysis. Quantitatively, the measurement and analysis results are found to have good agreement. The effectiveness of topology optimization considering the lamination direction of 3D printing was confirmed by the experimental result.

본 연구에서는 3D 프린팅 FDM 방식의 적층 방향에 따라 기계적 물성이 달라지는 이방성 특성을 확인하고 이를 이용하여 위상 최적설계를 수행하였다. 벤치마크 문제인 자동차 현가장치 부품 중 하나인 로어 컨트롤 암에 대하여 밀도법 기반 위상 최적설계를 수행하였으며, 외부 하중과 이방성 특성에 따라 위상 최적결과가 다르게 나타나는 것을 확인하였다. 이를 이용하여 최적화된 모델에 대하여 3D 프린터로 적층 방향을 달리하여 2가지 시험품을 제작하였으며 인장시험을 수행하였다. 시험시 3D 비접촉 변형률 측정기를 이용하여 변형률을 구하였으며 이를 CAE 응답해석으로 얻은 변형률과 비교한 결과가 정량 및 정성적으로 일치하는 것을 확인하였다. 3D 프린팅 적층 방향을 고려한 위상 최적모델의 인장 실험 결과를 통해 해당 최적설계 방법론의 유효성을 검증하였다.

Keywords

Acknowledgement

이 연구는 금오공과대학교 대학 학술연구비로 지원되었음(2021).

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