Picosecond time scale imaging of mechanical contacts
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- 作者：Thomas Dehoux ; Oliver B. Wright ; Roberto Li Voti
- 关键词：Contact mechanics ; Nanoindentation ; Picosecond ultrasonics ; Thermoreflectance
- 刊名：Physics Procedia
- 出版年：2010
- 出版时间：1 January 2010
- 年：2010
- 卷：3
- 期：1
- 页码：351-356
- 全文大小：391 K
文摘
By means of an ultrafast opto-acoustic technique we study the nanoindentation of thin chromium films on sapphire substrates by a ceramic ball bearing. Acoustic echoes at 40 GHz returning from the film-indenter interface allow the film indentation profiles to be probed to sub-nanometer resolution over contact areas 25 μm in radius. The deformation of the films during loading is thereby revealed. Furthermore, thermal wave imaging of the contact at megahertz frequencies is simultaneously achieved.