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http://dx.doi.org/10.5139/JKSAS.2002.30.7.044

Analysis of low-velocity impact on composite sandwich panels using an assumed strain solid element  

Park, Jung (건국대학교 항공우주공학과 대학원)
Park, Hoon-Cheol (건국대학교 기계항공공학부)
Yoon, Kwang-Joon (건국대학교 기계항공공학부)
Goo, Nam-Seo (건국대학교 기계항공공학부)
Lee, Jae-Hwa (국방과학연구소)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.30, no.7, 2002 , pp. 44-50 More about this Journal
Abstract
Low-velocity impact on composite sandwich panel has been investigated. Contact force is computed from a proposed modified Hertzian contact law. The Hertzian contact law is constructed by adjusting numerical value of the exponent and reducing the through-the- thickness elastic constant of honeycomb core. The equivalent transverse elastic constant is calculated from the rule of mixture. Nonlinear equation to calculate the contact force is solved by the Newton-Raphson method and time integration is done by the Newmark-beta method. A finite element program for the low-velocity impact analysis is coded by implementing these techniques and an 18-node assumed strain solid element. Behaviors of composite sandwich panels subjected to low-velocity impact are analyzed for various cases with different geometry and lay-ups. It has been found that the present code with the proposed contact law can predict measured contact forces and contact times for most cases within reasonable error bounds.
Keywords
composite sandwich; Newmark-beta method; modified Hertz's contact 1aw;
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