Abstract
Laminated composites have widespread application in a variety of sectors, including space exploration. Drilling (bolting or riveting) is a frequently employed technique in the assembly of composites. Various static and fatigue loads, as well as their combinations, are applied to composite structures in the real world. The primary objective of this paper is to investigate the behavior of drilled GFRPCs subjected to mixed static loading (fixed-ended specimens subjected to bending loading). Therefore, laminated GFRP composites with stacking sequence of 45;[+45,0,-45,90]s are prepared and subjected to mixed-static loading. In addition, Acoustic Emission(AE) methodology is employed as structural health monitoring(SHM) technique. The mechanical data analysis for drilled and undrilled specimens reveals that the region I of load-displacement(L-D) curves includes a cubic function. Furthermore, drilling results in reduction of Max. allowable load, Max. allowable displacement, mean stiffness, average ratio of stiffness variations to displacement changes, and third order derivative of L-D curve by 35, 14, 24.97, 21.1, and 25.3%, respectively. AE data analysis reveals, in comparison with undrilled specimens, drilled composite coupons release high energy AE events before collapse point due to stress concentration around the hole.