This work proposes an investigation on the failure behavior of Glass Fiber ReinforcedPolymer (GFRP) laminates with an open hole or a center crack under bothmulti-axial quasi-static and fatigue loading. To this end, several multi-axial stressstates were applied by means of a modified Arcan rig, specifically designed for fatiguetests.It was shown that the stress-strain behavior of notched [+45/90/ - 45/0]s and[0/90]2s layups under multi-axial quasi-static loading was characterized by a significantnonlinearity. This phenomenon becomes more and more significant undershear-dominated loading conditons. It was also shown that, according to Digital ImageCorrelation (DIC) analysis, the damage of all the investigated laminate layupsunder fatigue loading is generally much more diffused compared to the one underquasi-static loading.More importantly, the damage mechanisms of investigated specimen configurationsunder multi-axial quasi-static loading were different compared to multi-axialfatigue loading. This is a challenge for the development of physics-based computationalmodels, since the damage initiation and progression can be substantially differentdepending not only on the multi-axiality ratio but also the loading condition(quasi-static versus fatigue).
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