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이중나선구조를 응용한 개방형 트러스 구조의 최신 단위셀에 대한 강성 및 강도에 대한 연구
최정호(J. H. Choi),권영도(Y.D. Kwon),이정환(J. H. Lee) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
The objective of this paper is to find an effective stiffness and effective strength for a new unit-cell model which is designed by double helical structure coming from DNA (deoxyribonucleic acid) geometry. The unit-cell model in here is a laminated pinwheel truss defined like fourfold truss. Relative density for the double pinwheel truss is derived at first. It is expected that the relative density is proportional to a ratio with a thickness of truss and a length as a square exponent when the outer volume in the pinwheel truss is a regular hexagon. The ideal solution for both effective modulus and effective strength is based on an open-cell structure reported by Gibson and Ashby and exponent of relative density in there is defined as an unknown number, n. Applied software is ABAQUS and designed pinwheel truss models are six totally; three for a pinwheel truss and three for a laminated pinwheel truss. Applied material is stainless steel 304 which is a common material. Applied boundary condition is a uniaxial compression. Thus, it can expect the exponent of the relative density related to effective stiffness is about 1 which infers stiffness for the double pinwheel truss is similar to honeycomb unit-cell model. The exponent of the relative density related to effective strength is closed until 1. In addition, as a thickness of truss is to be bigger, the effective stiffness or strength for the double pinwheel unit-cell truss is to be lower than a single pinwheel unit-cell truss. In conclusion, effective stiffness or effective strength is proportional to a thickness of truss and is reciprocal proportion to a laminated number of a pinwheel unit-cell truss.
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