Interfacial friction is important for manufacturing processes using ultrasonic vibration since ultrasonic energy is transferred from horn to welding interfaces of work pieces through movement and contact behavior of surfaces. A 3D thermal-mechanical FE model is built to investigate the interfacial friction behavior of ultrasonic vibration by simulating a typical ultrasonic welding (UW) process which uses the technology of ultrasonic vibration to form material joints. The effects of friction coefficient of horn/work piece interface and coefficient of friction work converting to heat on the thermal-mechanical fields of welding interface are investigated.

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