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Frictional effect of ultrasonic-vibration on upsetting
Authors:Hung Jung-Chung  Tsai Yu-Chung  Hung Chinghua
Institution:a Department of Mechanical Engineering, National Chin-Yi Institute of Technology, Taiwan, ROC
b Department of Mechanical Engineering, National Chiao Tung University, Taiwan, ROC
Abstract:The ultrasonic-vibration ring compression test and finite element analysis were performed on aluminum alloy specimens to explore the frictional effect of superimposing ultrasonic-vibration during upsetting. The extrapolated compression test was first adopted to obtain the frictionless material properties for finite element analysis. Experimental results of extrapolated compression test also indicate that ultrasonic-vibration can reduce the compressive force when friction is eliminated and can increase the temperatures of a material at the same time.The following results of the hot extrapolated compression test and the hot ring compression test reveal that increasing temperature by ultrasonic-vibration may reduce the flow stress and increase the interfacial friction. Finally, finite element analysis was conducted to derive the friction calibration curves and to evaluate the friction factor.
Keywords:Ultrasonic-vibration  Extrapolated compression test  Hot ring compression  Interfacial friction  Aluminum alloy  Finite element simulation
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