Abstract
Short-term off-axis stress relaxation behavior of unidirectional carbon fiber-reinforced composite (T800H/Epoxy) has been examined at high temperature. Stress relaxation tests were performed at 100℃ on plain coupon specimens with various off-axis angles : θ=0,10,30,45,and 90°. For each of these off-axis angles, the stress relaxation tests were carried out at three different strain levels. The stress relaxation phenomenon was clearly observed for all off-axis angles, including θ=0° Just after the total strain was kept constant, the stress rapidly relaxed with time in a short period. Then, the relaxation rate of the composite stress tended to vanish. The extent of the transient stress relaxation was significantly dependent on the total strain kept constant and the fiber orientation angle.
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