抄録
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 of the stress-strain relationships and fracture stress loci are presented. It is shown that stiffness and strength decreased with the increase in the angle θ of fiber orientation measured from the direction of principal stress, and the Tsai-Wu criterion applied very well.
