Debonding Process In Composites Using BEM
Author(s)
P. Prochazka & M. Valek
Abstract
The paper deals with the debonding fiber-matrix process in composite materials. A
couple of papers has been focused on this problem by the authors of this paper. As
usual, the influence of separate pure normal and pure shear energy has been studied
for obtaining the overall material properties. Such an approach is a simplification
of the problem describing the mechanical behavior of the interface between fibres
and the matrix in composite materials, since the standard procedure consisting of
the superposition of both normal and shear influences is no longer admissible due
to the strongly nonlinear behavior of the process. In this paper a more complex
development of the debonding zones is shown, namely, responses of successively
applied normal and then shear load and also first shear load and then normal load
are observed. The physical behaviour of the interface is non-convex. This assertion
immediately follows from the penalty formulation of the problem as published
recently by the first author. The penetration of fiber into the matrix is not allowed
in every case. In this contribution we start with a definition of the model describing
the transfer of elastic stresses from the matrix to the fiber. Then, the contact
problem is formulated in a manner leading to a very fast Uzawa’s algorithm for
its solution. In order to speed up the iterative solution influence matrices are created
before the iteration. The approach turns to a similar one known as generalized
transformation field analysis. Debonding processes in the interfacial zone are illustrated
by examples.
Keywords: composites, debonding process, general transformation field method,
Uzawa’s algorithm.
1 Introduction
A 2D unit cell model with diagonal symmetry is considered to study an effect of
imperfectly bonded interfaces. This simplification has only formal nature, and is
Keywords
composites, debonding process, general transformation field method,
Uzawa’s algorithm
Related Book
Other papers in this volume
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