철도차량용 제동디스크의 온도 및 물성치 변화에 관한 연구(Ⅰ)

초록

This study investigates the change of the temperature and mechanical properties of the braking disk for the railway vehicle. The average temperature is measured about 100℃ and the maximum temperature is measured over 200℃ by non-contact sensor from Seoul to Chun-an. In the 20℃-300℃, the 0.2% offset yield strengths of the disk (GC25-30 material) are a little down to the reference value, but the linear relation of tensile test result is not find from the linear change of temperature. However, J1C values have the inverse proportion to the temperature, and the JIC value at 200℃ decrease 30.55% from the JIC. value of the room temperature. This result means that the crack length on the braking disk is rapidly increase at 200℃.