Impact Analysis Of Laminated And Sandwich
Composites Using A Plate Finite Element With
Strain Energy Updating
Author(s)
U. Icardi & L. Ferrero
Abstract
This paper deals with finite element simulation of low velocity-low energy
impacts on sandwich composites with laminated faces. A refined zig-zag model
with a high-order piecewise representation of in-plane and transverse
displacement components is used as a structural model in order to accurately
simulate the effects of the transverse normal stress and strain. The goal is to
develop a tool for improving the accuracy of conventional plate models, so as to
enable the impact analysis of sandwich composites. A strain energy updating
process is used for this purpose. As is customary, the Hertzian law and the
Newmark implicit time integration scheme are used. The contact radius is
computed within each load step by an iterative algorithm, which forces the
impacted top surface to conform, in the least-squares sense, to the shape of the
impactor. Then, the failure analysis is performed and the material properties of
the failed areas reduced. Nonlinear strains of von Karman type are used because
the transverse displacement can be quite large even when the plate deflection is
small. Comparison with numerical and experimental results published in
literature show the present model to be able to accurately predict the impact
force and the damage it induces.
Keywords: low velocity impacts, induced damage, FEA, sandwich structures.
1 Introduction
Dynamic loading due to the impact of foreign objects represents a serious design
concern for laminated and sandwich composites. Local damage appears as a
visible permanent indentation in laminated composites for high velocity (or
energy) impacts, while at low velocity it appears as global damage and mainly
Keywords
low velocity impacts, induced damage, FEA, sandwich structures.
Related Book
Other papers in this volume
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