Frictional effect of ultrasonic-vibration on upsetting |
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Authors: | Hung Jung-Chung Tsai Yu-Chung Hung Chinghua |
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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 |
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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. |
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Keywords: | Ultrasonic-vibration Extrapolated compression test Hot ring compression Interfacial friction Aluminum alloy Finite element simulation |
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