J.Compos.Mater. 38, 1977-1991, 2004
D. Pahr, C. Schuecker, F.G. Rammerstorfer and H.E. Pettermann
Institute of Lightweight Design and Structural Biomechanics,
TU Wien, Vienna, Austria
Finite element-based frist-ply failure strength investigations of perforated
laminates in the presence of residual ply stresses are presented.
Unit cell models are applied, where inter- and intra-laminar failures as well
as free-edge effects are taken into account on the ply level.
The critical stress states contain constant and variable stress parts, which
mean that nonradial loading paths are considered.
Failure envelopes are computed for different layups and residual stress
This way the strength evaluation of structures containing perforated laminates
can be performed on the macroscopic, i.e. structural, level.