Eigenstrain Zone Solution Of The Debonding
Process In Composites
Author(s)
P. Prochazka & S. Peskova
Abstract
The process of debonding of fibers from a matrix in composite materials plays a
very important role in the assessment of the bearing capacity of the aggregate. A
couple of papers by the present authors have focused on this problem. Here the
problem of debonding will be concentrated on a process being brought about due
to a normal load applied to a unit cell in a periodic medium. Such an approach is
atypical in the general problem describing the mechanical behavior of the
interface between fibers and matrix in composite materials. The standard
procedure consisting of both normal and shear influences is more complicated
due to the strongly non-linear behavior of the formulation.
Plenty of models have been proposed in the past. Some of them are very
usable, but suffer from inaccurate formulations, numerical instability or are too
robust. In this paper a new approach is suggested. It consists of introducing
eigenparameters in the interfacial zone describing the neighborhood of fibers.
Considering a matrix and also the fibers as stiff enough, the damage will occur
only in the interfacial zone. Because the damage can be described by
eigenparameters, the influence matrices are created in the sense of generalized
transformation field analysis to speed up the iterative solution of the nonlinear
problem. It will be shown that this approach offers a new very efficient and fast
algorithm, which in our case is based on finite element methods. The
generalization to boundary elements seems to be simple. The matrix will obey
von Mises – Huber - Hencky ideally elasto-plastic states, while fibers remain
elastic. This particular material describes especially steel-epoxy, glass-epoxy, or
graphite-epoxy composites. A couple of examples will show the ability of the
approach envisaged.
Keywords: debonding of fibers in composites, eigenparameters, microcracking,
constitutive behavior.
Keywords
debonding of fibers in composites, eigenparameters, microcracking,
constitutive behavior.
Related Book
Other papers in this volume
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