Volume 77, Number 6, March 2007
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||27 February 2007|
In situ observation of stereoscopic shapes of cavities in soft adhesives
Department of Applied Physics, The University of Tokyo - 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2 Japan Science and Technology Agency (JST/CREST) - Japan
Accepted: 26 January 2007
By using a new visualization technique, we succeeded in the in situ observation of the stereoscopic shape of cavities formed in a thin film of soft adhesives in the debonding process of the probe-tack test. We found that the cavity shape and the interfacial fracture behavior are strongly influenced by the cross-linking density of the soft adhesives: for soft adhesives, the cavity is nearly spherical, and the fracture slows down basically due to the blunting of the cavity edge, while for hard adhesives the cavity becomes pancake-like, and the fracture is due to the coalescence of cavities at the adhesive-probe interface.
PACS: 47.55.dp – Cavitation and boiling / 68.35.Np – Adhesion
© Europhysics Letters Association, 2007
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