Fatigue Strength Evaluation of a Composite Bogie Frame for Urban Subway Trains

초록

In the current study, the static structural safety and durability under the repeated loading conditions of the GFRP composite bogie frame were experimentally evaluated. Prior to evaluation, the in-plane, out-of-plane and fatigue properties of the base material were measured. Based on material data, the static structural safety was examined using the Goodman diagrams. The fatigue strength of the GFRP composite bogie frame was assessed under the repeated loading of 107cycles. The three types of dynamic loads (vertical, lateral and twisting loads) were simultaneously imposed to the bogie frame. During the fatigue test, the inside cracks of the bogie frame were monitored using X-ray radiograph method. The stress data measured in the static tests were within the endurance limit. In addition, there was no crack propagation under the repeated loading