کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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803008 | 1467563 | 2006 | 14 صفحه PDF | دانلود رایگان |
The elasto-plastic large deformation taking place in ultrasonic wire bonding is analysed by means of 2-D and 3-D finite element method. A special focus has been placed on how the important wire bonding parameters, such as bond force and power, affect the contact pressure along the wire-bond pad interface. It is shown that the contact interface had a long elliptical shape, and the maximum contact pressure occurred always at the periphery of the contact interface, which is consistent in the current 2-D and 3-D finite element analyses. The normalised real contact area as well as the maximum frictional energy intensity varied in a similar manner to the contact pressure, with the maximum values occurring at the periphery of contact interface, where weld is preferentially formed in practical wire bonding. A higher bond force does not result in a higher contact pressure, or higher frictional energy intensity, suggesting that a high bond force is not directly correlated to better wire bondability.
Journal: Mechanics of Materials - Volume 38, Issues 1–2, January–February 2006, Pages 11–24