Earticle

초록

영어

The objective of this study is to find the effective stiffness and compressive strengths of a unit-cell pinwheel truss and double pinwheel truss model designed following a double helical geometry similar to that of the DNA (deoxyribonucleic acid) structure in biology. The ideal solution for their derived relative density is correlated with a ratio of the truss thickness and length. To validate the relative stiffness or relative strength, ABAQUS software is used for the computational model analysis on five models having a different size of truss diameter from 1mm to 5mm. Applied material properties are stainless steel type 304. The boundary conditions applied were fixed bottom and 5 mm downward displacement. It was assumed that the width, length, and height are all equal. Consequently, it is found that the truss model has a lower effective stiffness and a lower effective yielding strength.

목차

Abstract
 1. Introduction
 2. Background
  2.1 General helix geometry [12] and fundamental idea
  2.2 Relative density of pinwheel truss
  2.3 Relative elastic modulus
  2.4 Relative strength
 3. Simulation
  3.1 Quasi static compression
  3.2 Unit model
  3.3 Boundary condition
  3.4 Simulation for elastic and yielding stress
  3.5 Simulation for ultimate strength
 5. Results
 6. Discussion
 7. Conclusions
 REFERENCES

저자

• Jeongho Choi [ 최정호 | Aircraft Design and Development Department, Korea Aerospace Industries LTD ] Corresponding author

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