흑연/에폭시 복합재의 동적 특성

Abstract

In this paper, the response of graphite/epoxy laminated composite beams subjected to impact loadswithout damage, is studied by the use of the developed finite element program. The modified Hertziancontact law considered elasto-plastic process is used to calculate the dynamic responses between theimpactor and laminated target. Numerical results are presented to demonstrate the effects on the historiesof contact force, deflection, damage energy, strain and stress through the thickness due to stackingsequence. In view of the kinetic energy response, [0/30/0/-30]2S laminate is faster than that of other twolaminates due to its flexural stiffness. In special, the distribution of stress through the thickness showsnearly linear despite its discontinuity of stacking sequences for dynamic analysis unlike static analysis ina laminated composites.