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| Nonlinearity Harmonic at Contact Interface in Ultrasonic Bonding Transducer System |
| Li Zhanhui1,2; Wu Yunxin1; Long Zhili1 |
| (College of Mechanical & Electronical Engineering,Central South University, Changsha, 410083, China) |
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Abstract Nonlinearity characteristic of ultrasonic transducers bonding system makes the capillary vibration chaos and bonding strength degrades. The model of ultrasonic propagation at contact interface between two solid is established. And it is simulated. The vibration velocity is measured using laser Doppler non-contact measurement. The bond strength is tested. Wave distortion and the higher order harmonic generation are arisen by nonlinearity of contact interface layer. The pre-stress should be strict with a given range in order to enhance bond strength. The higher harmonic of capillary relate to ultrasonic bond strength.
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Received: 04 June 2009
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2010, Vol. 29 
