Abstract
The time-dependency of damage development and translaminar fracture mechanisms were investigated in 5-harness satin weave carbon fabric reinforced polyphenylene sulfide composites above their glass transition temperature through an approach combining acoustic emission (AE) monitoring and fracture mechanics. Single edge notch specimens from two stacking sequences (quasi-istropic and angle-ply) were subjected to cyclic incremental tensile loading. Tensile tests were carried out for several loading rates or histories featuring creep and/or recovery stages. Both laminates’ failure mechanisms do not seem to be influenced by time-dependent phenomena. However, AE monitoring revealed AE activity during creep stages for both stacking sequences, thus highlighting possible time-dependent damage events. If those AE events are indeed related to time-dependent damage, this observation would mean that this damage is only subcritical. Those observations need to be investigated further with acoustic emission coupled to other monitoring tools, such as digital image correlation, in-situ microscopic observations or thermography, to provide a better insight of the physical phenomena associated with the monitored acoustic emission signals.
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