Failure Analysis on Loosing Bar of An Elevator Brake

A failure analysis was performed on loosing bar of an elevator brake. The macroscopic morphology and metallographic microstructure of the elevator brake loosing bar were investigated based on the optical microscope and scanning electron microscope analysis. The results showed that the material of elevator brake loosing bar meets the technical standard of 45 steel. The abnormal peel wear was caused by the abnormal rotation between the loosing bar and magnetic ring.