High temperature translaminar fracture of woven-ply thermoplastic laminates in tension and in compression
Résumé
PEEK reinforced by a woven carbon fibers obtained by consolidation process, has been studied bymeans of Compact Tension (CT) and Compact Compression (CC) tests. An orthotropic laminateand two quasi-isotropic laminates, have been tested at room temperature (RT) and at 150 ◦C (i.e.for a temperature slightly higher than the glass transition temperature Tg), with the purpose ofevaluation the influence of the stacking sequence and the temperature on the damage mechanisms.The CT type tests show that the temperature influence on the overall mechanical responseremains low. In contrast, the CC type tests show a decrease in the mechanical resistance and anaugmentation in the global ductile behavior. By means of the 2D Digital Image Correlation andthe implementation of a algorithm based on the sigma indicator (confidence interval in the area ofinterest), the crack propagation was measured during loading, then the G-R curves have beenobtained from the compliance method. In tension, there is an increase in the translaminar fracturetoughness with the laminate thickness and a slight improvement in this one due to the influenceof temperature. In compression, the temperature strongly decreases the translaminar fracturetoughness.
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