복합재 적용 하이브리드 철도차량 차체의 내구성 평가

초록

length of 23m was manufactured as a sandwich structure composed of a aluminium honeycomb core and woven fabric carbon/epoxy face. In order to evaluate fatigue strength of the composite carbody, the carbody was excited by two 50-ton capacity hydraulic actuators. The excitation frequency was determined by natural frequency evaluation test under full weight condition. The test was conducted for 2x106cycles. During the fatigue test, fatigue cracks of the composite carbody and steel underframe were inspected by the nondestructive tests using X-ray and liquid penetrant. From test tests, no fatigue crack was detected.