Abstract
Development of an engineering model for predicting the off-axis ratcheting behavior of unidirectional CFRP laminates has been attempted. For this purpose, the ratcheting behavior of a unidirectional carbon/epoxy laminate under off-axis cyclic loading at high temperature is studied with emphasis on its dependence on load waveform (i.e. stress ratio) and fiber orientation. First, off-axis ratcheting tests with different levels of maximum and mean stresses are performed on coupon specimens with different fiber orientations, respectively. The experimental results show that the accumulation of ratcheting strain occurs in the unidirectional CFRP laminate, regardless of fiber orientation, and the off-axis ratcheting behavior is similar to the off-axis transient creep behavior in all aspects of its stress, time and fiber orientation dependence. It is demonstrated that the purposed model allows adequately predicting the off-axis ratcheting behavior of the unidirectional CFRP laminate for different stress ratios as well as for different fiber orientations.
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