文档介绍：Computational Materials Science 29 (2004) 475–493
matsci
A mechanical model for fiber posite
materials with elasto-plastic matrix and interface debonding
Roberto Brighenti *
Department of Civil Engineering, Environment and Architecture, University of Parma, Parco Area delle Scienze 181/A,
43100 Parma, Italy
Received 19 February 2003; received in revised form 24 October 2003; accepted 13 December 2003
Abstract
The behaviour of fiber-posites is examined through the formulation of a non-linear constitutive law
obtained through a physical-based approach. The elasto-plastic macro constitutive equations for such a class of
materials, composed by a matrix phase with elasto-plastic behaviour and several fiber-reinforcing phases, is obtained by
considering an imperfect bounds between the matrix and the fibers, . a certain amount of sliding is assumed to be
present at the matrix–fiber interface. The fibers are assumed to have only axial stiffness with negligible relative matrix–
fiber displacements orthogonal to the fiberÕs axis. The amount of sliding has been determined through energetic con-
siderations by taking into account the evolution of the shear stress distribution along a single fiber during an increasing
load history applied to posite. The mechanical constitutive law has been implemented in a . code and some
numerical simulation have been performed in order to assess the reliability of the proposed model.
Ó 2004 Elsevier . All rights reserved.
Keywords: Fiber-posite (FRC); Homogenisation; Elasto-plastic materialÕs behaviour; Debonding; FiberÕs sliding; Finite
elements
1. Introduction homogenisation models (mathematically based ap-
proach [2–4]), etc.
The increasing importance posite mate- From a mathematical point of view, the prob-
rials in many application fields, has determined the lem of the equilibrium of a multi-phase material
necessity to describe with great accuracy their involves a sets of equations with rapidly vary-
over