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Optimal Design of a Multi-Layered Plate Structure Under High-Velocity Impact

다중판재의 고속충돌에 관한 최적설계

  • 윤덕현 (현대자동차) ;
  • 박명수 (연세대학교 대학원 기계공학과) ;
  • 정동택 (연세대학교 기계공학부) ;
  • 유정훈 (한국기술교육대학교 메카트로닉스공학부)
  • Published : 2003.10.01

Abstract

An optimal design of a multi-layered plate structure to endure high-velocity impact has been suggested by using size optimization after numerical simulations. The NET2D, a Lagrangian explicit time-integration finite element code for analyzing high-velocity impact, was used to find the parameters for the optimization. Three different materials such as mild steel, aluminum for a multi-layered plate structure and die steel for the pellet, were assumed. In order to consider the effects of strain rate hardening, strain hardening and thermal softening, Johnson-Cook model and Phenomenological Material Model were used as constitutive models for the simulation. It was carried out with several different gaps and thickness of layers to figure out the trend in terms of those parameters' changes under the constraint, which is against complete penetration. Also, the measuring domain has been shrunk with several elements to reduce the analyzing time. The response surface method based on the design of experiments was used as optimization algorithms. The optimized thickness of each layer in which perforation does not occur has been obtained at a constant velocity and a designated total thickness. The result is quite acceptable satisfying both the minimized deformation energy and the weight criteria. Furthermore, a conceptual idea for topology optimization was suggested for the future work.

Keywords

Size Optimization;Explicit Time-Integration Finite Element Method;High-Velocity Impact;Response Surface Method

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