抄録
The effect of cyclic heating on the off-axis creep deformation of cross-ply CFRP laminate under a constant stress has been examined. Cyclic heating creep tests, in which a specimen is subjected to cyclic change in temperature between 40℃ and 70℃ under a constant stress, are performed for different fiber orientations (θ=0°, 15°, and 45°) at different constant values of applied stress (40%, 50% and 60%UTS at 70℃). The experimental results from the cyclic heating creep tests are compared with those from the constant temperature creep tests (40℃, 55℃, and 70℃) to observe the effect of cyclic change in temperature on constant stress creep behavior. For θ=15°, 45° the off-axis creep strain under a constant stress with cyclic heating becomes larger than that under a constant stress at constant temperature. It is suggested that the creep behavior is affected by the instantaneous plastic strain that develops during the initial temperature rise under a constant stress. The strain fluctuation with temperature is found to be comparable to that of thermal strain due to the change in temperature.
