Determination and interpretation of changes in thermophysical properties of a carbon-fibre prepreg during cure (original) (raw)
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Stress Relaxation of Thermosetting Prepreg Composites During Cure
This paper presents the experimental results for time-temperature dependent viscoelastic behavior and cure kinetics of two commercial carbon fiber-epoxy prepregs, Cytec IM7/977-2 unidirectional tape (UD) and Cytec IM7/977-2 plain weave fabric (PW). An in-depth study on the oscillatory and transient rheological behavior of prepreg composites is conducted using a dynamic mechanical analyzer (DMA) and the study of cure kinetics is conducted using a differential scanning calorimeter (DSC). A novel experimental methodology is proposed to describe the stress relaxation behavior of prepreg composites during cure. Time- and cure-dependent stress relaxation behavior of prepreg composites is studied in three in-plane directions: 0, 45, and 90 degrees of the laminates. Several other factors, such as the mismatch of fiber orientation of adjoining plies, stacking sequence of the laminate, and relative position of the plies with respect to the neutral axis are considered to study the stress relaxation behavior during cure. The study shows that the relaxation modulus during cure is case dependent. Moreover, when comparing the performance between UD and PW prepregs, it shows that the PW laminate is capable of releasing more stress than the UD laminate.
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