Influence of Unifilo® Ply in the Interlaminar Shear Fatigue Resistance of GFRP

The static and cyclic interlaminar shear stress behaviors of two composites have been compared in this study. One with a Unifilo® MAT layer , and the other one without it [02]S. Short-beam tests were conducted following ASTM D2344- 00 standards for static tests. For fatigue tests, as there are no standardized procedures, proposals from several authors were considered, choosing the configuration previously used in static testing. Tests were performed at 1 Hz frequency and sinusoidal waveforms were employed. S-N curves were obtained for stress ratios R of 0.1, 0.2 and 0.5 up to 106 cycles and partial CAL (Constant Amplitude Life-time) diagrams were built.