TITLE

# Inhomogeneous evolution of a glass surface via free, rapid expansion

AUTHOR(S)
Sharma, Anju; Himanshu Jain; Carnali, Joseph O.; Jain, Isha H.
PUB. DATE
October 2003
SOURCE
Applied Physics Letters;10/6/2003, Vol. 83 Issue 14, p2802
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
We have proposed a mechanism of inhomogeneous evolution of a viscous fluid at elevated temperature from rapid, free expansion/stretching, which gives rise to regular structural and/or chemical defects on the surface. Support for this phenomenon is demonstrated by a simple experiment consisting of rapidly blowing a film-coated glass tube and studying its microstructure in detail. The surface of the blown glass exhibits a regular pattern of â€œsurface cracking,â€ indicating nonuniform expansion of the molten glass. This cracking is attributed to the strong dependence of viscosity on temperature, and is likely to occur in a variety of viscoelastic-forming operations. Â© 2003 American Institute of Physics.
ACCESSION #
10964893

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