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low Velocity Impact Behavior Analysis of 3D Woven Composite Plate Considering its Micro-structure  

Ji, Kuk-Hyun (서울대학교 기계항공공학부)
Kim, Seung-Jo (서울대학교 기계항공공학부)
Publication Information
Composites Research / v.18, no.4, 2005 , pp. 44-51 More about this Journal
Abstract
In this paper, we developed the direct numerical simulation(DNS) model considering the geometry of yams which consist of 3D orthogonal woven composite materials, and using this model, the dynamic behavior of under transverse low-velocity impact has been studied. To build up the micromechanical model considering tow spacing and waviness, an accurate unit structure is presented and used in building structural plate model based on DNS. For comparison, DNS results are compared with those of the micromechanical approach which is based on the global equivalent material properties obtained by DNS static numerical tests. The effects with yarn geometrical irregularities which are difficult to consider in a macroscopic approach are also investigated by the DNS model. Finally, the multiscale model based on the DNS concepts is developed to enhance efficiency of analysis with real sized numerical specimen and macro/micro characteristics are presented.
Keywords
3D orthogonal woven composite material; Direct Numerical Simulation, DNS; Low velocity impact; Multiscale model;
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