An investigation was conducted of the effects of fiber waviness on the compressive behavior of unidirectional and crossply laminates. Unidirectional and crossply carbon/epoxy specimens with uniform and graded fiber waviness were fabricated. They were loaded in axial compression while monitoring strains and failure progression photographically. Unidirectional specimens with uniform through the thickness waviness showed appreciable reduction in modulus. Experimental results were in close agreement with predictions based on an equivalent off-axis specimen and an analytical constitutive model. Unidirectional and crossply specimens with graded or localized waviness showed a slight reduction in axial modulus but a more significant one in compressive strength. Results for the unidirectional specimen were in close agreement with predictions based on an equivalent off-axis specimens. In all cases, failure seems to be initiated by local transverse tensile failure, delaminations and subsequent layer buckling leading to ultimate failure.
|Number of pages
|American Society of Mechanical Engineers, Applied Mechanics Division, AMD
|Published - Dec 1 1994
ASJC Scopus subject areas
- Mechanical Engineering