도상자갈 비산에 의한 경량 대차프레임 적용 적층 복합재의 저속충격 손상 및 충격 후 압축 강도 평가

Evaluation of Low Velocity Impact Damage and Compressive Strength After Impact for Laminate Composites Applied to Lightweight Bogie Frame Induced by Flying Railway Ballast

In order to evaluate the structural integrity of a GFRP composite bogie frame due to flying railway ballast, the low velocity impact test and compressive test after impact was conducted for glass fiber/epoxy 4-harness satin woven laminate composites applied to skin part of a bogie frame. The impact test was performed using a instrumented impact testing system with energy levels of 5J, 10J and 20J and the designed impactor based on typical railway ballast shapes such as sphere, cube and cone to simulate the ballasted track environments. The compressive strength was tested to according to ASTM D7137 to evaluate the degradation of mechanical property of impact damaged laminate composites. The results showed that the damage area and the degradation of compressive strength after impact for laminate composites was increased with increase in impact energy for all ballast shapes and was particularly most influenced by cone ballast shape.