Abstract
This work addresses the fracture characterization of scarf adhesive repairs on carbon epoxy composites under high-cycle fatigue loading. Scarf repairs were tested under static and fatigue loading in three-point bending considering a scarf angle of 10°, aiming to determine its static strength and fatigue life. Static and fatigue finite element analyses including a cohesive mixed-mode I+II model were performed. The high-cycle fatigue model is based on the modified Paris law to simulate material softening as function of time, considering a unique damage parameter that englobes quasi-static and fatigue degradation. The numerical static load-displacement curve, fatigue life prediction and evolution of normalized compliance in function of the number of fatigue cycles are in good agreement with the average experimental results. Furthermore, several additional numerical analyses were performed to assess the influence of the scarf angle on the static strength and fatigue life predictions of these repairs.
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