The Effect Of Functionally Graded Core On
The Dynamic Fracture Behavior In
Model Sandwich Structures
Author(s)
M. El-Hadek
Abstract
Fracture behavior under impact loading conditions of functionally graded core in
a sandwich construction is examined. A model sandwich structure comprising of
a graded core with a bilinear volume fraction variation is considered for
numerical simulations. For comparative purposes, conventional sandwiches with
a uniform volume fraction core are also developed. The crack tip in both
configurations is positioned such that both global and local material
characteristics are matched in these two models. The numerical simulations
suggest that crack tip loading rates in terms of normal and shear stresses and
stress intensity factors are consistently higher in the conventional structure when
compared to the graded one. A parametric study of different elastic impedance
gradients in the core material suggests enhanced mixed-mode fracture
performance of a graded sandwich structure, having a face-sheet/core interface
crack when compared to a conventional counterpart under stress-wave loading
conditions.
Keywords: sandwich structures, functionally graded materials, impact, dynamic
fracture, finite element analysis.
1 Introduction
Currently, there is a great deal of research on modeling and characterization of
sandwich structures. Recent works have addressed a variety of mechanical
failure related issues such as face-sheet damage and face-sheet/core
Keywords
sandwich structures, functionally graded materials, impact, dynamic
fracture, finite element analysis
Related Book
Other papers in this volume
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