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Gonzalez, Juan Daniel Pujols
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document
High temperature translaminar fracture in tension and in compression of woven-ply thermoplastic laminates
Abstract
The translaminar fracture behavior of three composite laminates, based on thermoplastic matrix PEEK reinforcedby a woven carbon fibers obtained by consolidation process, has been studied by means of Compact Tension (CT) and Compact Compression (CC) tests.An orthotropic laminate and 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 of evaluation 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 response remains low. In contrast, the CT type tests reveal a diminution in the mechanical resistance and an augmentation in the global ductile behavior.By means of the 2D Digital Image Correlation and the implementation of a algorithm based on the sigma indicator (confidence interval in the area of interest), the crack propagation was measured during loading, then the G-R curves have been obtained from the compliance method