Nonlinear analysis of initally prestressed laminates
by
M. Sejnoha and K. Matous
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
overall response of the laminate. A robust optimization procedure
based on evolution strategies is implemented to provide for an optimal
fiber prestress. A ductile graphite-aluminum composite system is
examined to explore effects of matrix yielding on the proposed
optimization technique. The numerical results show that the
initial fiber prestress reduces local stress fields found in the
matrix. Such an observation suggests that an effective exploitation of
the high fiber tensile strength may provide a substantial increase of
the load bearing capacity of laminates.
Last modified: Nov 4 2000