Techno Press

Steel and Composite Structures   Volume 16, Number 4, March 2014, pages 389-415
Higher order impact analysis of sandwich panels with functionally graded flexible cores
K. Malekzadeh Fard

Abstract     [Full Text]
    This study deals with dynamic model of composite sandwich panels with functionally graded flexible cores under low velocity impacts of multiple large or small masses using a new improved higher order sandwich panel theory (IHSAPT). In-plane stresses were considered for the functionally graded core and face sheets. The formulation was based on the first order shear deformation theory for the composite face sheets and polynomial description of the displacement fields in the core that was based on the second Frostig's model. Fully dynamic effects of the functionally graded core and face-sheets were considered in this study. Impacts were assumed to occur simultaneously and normally over the top and/or bottom of the face-sheets with arbitrary different masses and initial velocities. The contact forces between the panel and impactors were treated as internal forces of the system. Nonlinear contact stiffness was linearized with a newly presented improved analytical method in this paper. The results were validated by comparing the analytical, numerical and experimental results published in the latest literature.
Key Words
    sandwich panel; FG core; spring-mass system; multi masses; low-velocity impact; contact law
K. Malekzadeh Fard:
Department of Structural Analysis and Simulation, Space Research Institute, Malek Ashtar University of Technology, Tehran-Karaj Highway, Post box: 14665-143, Tehran, Iran.

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