K. Srirengan et al., MODAL TECHNIQUE FOR 3-DIMENSIONAL GLOBAL LOCAL STRESS-ANALYSIS OF PLAIN WEAVE COMPOSITES/, Composite structures, 39(1-2), 1997, pp. 145-156
A global/local method based on modal analysis was developed which faci
litates the three-dimensional stress analysis of plain weave composite
structures. This requires minimal computational effort while retainin
g reasonable accuracy. Homogenized material properties were used for t
he global analysis. The global response of a region of interest was de
composed into a few fundamental macroscopic modes which were either st
rain modes or stress modes. The strain modes were calculated from the
boundary displacements and the stress modes were calculated from the b
oundary forces. To obtain the detailed local solution for the region o
f interest, unit modal solutions were scaled by the modal magnitudes a
nd then superposed. The unit modal solutions were calculated a priori
using a refined local model. A short cantilevered plate subjected to e
nd moment and transverse end load was analyzed to evaluate the perform
ance of the proposed method. Failure initiation predicted by the propo
sed method was found to match reasonably well with the conventional fi
nite element prediction obtained using a detailed mesh for the entire
plate. (C) 1997 Elsevier Science Ltd.