Fatigue behavior of nickel sheet via the magnetic force

摘要

In this paper, we investigated the feasibility of fatigue life of the nickel sheet using alternating magnetic force. The working principle was employed the AC servo motor to actuate the magnetic wheel and produced an alternating stress acting on the nickel sheet. The software of computer-aided engineering, Ansoft (Maxwell) and Comsol, were adopted to estimate the effect of the rotation speed, gap and size on the magnetic force and deformation of the specimen. The fracture specimens were examined by optical microscopy. A high-speed CCD system was used to capture image of the micro-component. The longer of the specimen the larger magnetic force would occur on the specimen. The magnetic force acting on the specimen increased with the decrease of gap between specimen and magnet. Moreover, the fatigue life becomes shorter with increased stress amplitude. Experimental results indicate that this fatigue test system can provide alternating stress acting on the specimen to conduct the fatigue life.