Abstract
The mechanical behavior of laminated graphite/epoxy tubes under multiaxial monotonic loadings was elucidated with special emphasis on the effects of fiber orientation, loading condition and laminate structure. Tubular specimens of symmetrically laminated graphite/epoxy of 5 different fiber orientations θ (the angle of fiber measured from the specimen axis) were tested under monotonic combined tension/compression and torsion. Based on the preliminary results of the proceeding paper, the angle θ was specified to be 0°, ±22.5°, ±45°, ±67.5°and ±78.75°. The results on the stress-strain relationships and fracture stress loci were presented. It was shown that stiffness and strength decreased with an increase in the deviation of fiber orientation from the direction of principal stress, and the Tsai-Wu criterion applied very well. The theory which accounts for the fracture loci of arbitrary fiber orientations will be a future objective of research.
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