INELASTIC ANALYSIS OF Gr/Al COMPOSITE LAMINATES WITH
PRESTRESSED
FIBERS
K. MATOUS, AND M. SEJNOHA
CTU, Fac. of Civil Eng., Dep. of Structural Mechanics
Thákurova, 166 29 Prague 6
Abstract
A simple multilayered plate element combined with a micromechanical
analysis of fibrous composite materials is used to investigate an
effect of the initial fiber prestress on both the local and the overall
response of the laminate. A robust optimization procedure
based on evolution strategies is implemented to provide for an optimal
fiber prestress. An elastic version of the present optimization
procedure has been presented in series of papers of Matous&Sejnoha
[1]-[2]. It has been shown that the previously defined
constraints guarding the elastic response of laminates during
optimization process were to strong to fully utilize a great potential
of the fiber tensile strength. In the present formulation these
constraints are substantially weakened allowing the matrix phase to
undergo an inelastic deformation. In the present formulation we limit
our attention to loading rates which promote inelastic deformation
independent of time so that the inelastic part is represented by a
plastic strain only.
Acknowledgment
Financial support was provided by the GACR 103/97/1255 and by the GACR
103/97/P040.
© 2006 UIUC and Dr. Karel
Matous