Investigation and determination of low velocity impact resistance for composite materials strengthened with frame

Composite materials formed by combining at least two different materials in macro dimensions are widely used in defense industry, armor designs, aviation, space technologies, automotive, robotics, medical field, construction and construction sectors. The behavior of composite plates used as coating surfaces under load is suitable to be evaluated together with the structural load carrier system to which they are connected. For this purpose, the mechanical performance of frame-supported composite plates at low impact rates was evaluated by numerical and mechanical tests. To accommodate the composite plates, support frames with 9 square gaps and 25 square gaps and wall thickness starting from 0.1 mm and reaching 5 mm are designed. The composite materials placed in the frame are designed to have 12 layers and a 3 laying angle [0,45,-45,90]. The frame is designed from armor steel material and composite material is designed from e-glass/epoxy woven fabric material. The designed samples were analyzed both in ANSYS under the impact of 10 J and subjected to laboratory testing with a low-speed impact tester in the "Biomechanics and Strength Laboratory" of Başkent University. As a result of the studies, low-speed impact energy retention and damage situations of the frame-supported and composite parts according to the shape and wall thickness were evaluated, and it was seen that the energy retention rate in the composite plate decreased as the wall thickness increased.