전동차 차륜의 반복 구름 접촉에 의한 피로균열 전파에 관한 연구

A Study on Fatigue Crack Growth of an EMU Wheel due to Repeated Rolling Contacts

The EMU wheel is one of the most important component for the vehicle safety. For the tensile, fracture toughness and crack propagation tests, several specimens were collected from actual wheels. FEM ,analysis also was performed on the crack that was assumed to be 15 mm in depth under the wheel tread surface. The stress intensity factors $K_{I}$ and $K_{II}$ at the crack tip under the stress ($P_{max}$ = 911.5 MPa) due to a rolling contact were analyzed for crack growth characteristics. As a result, the perpendicular crack was found to be more dangerous compared to the parallel one.