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Fracture Analysis, a Basic Tool to
Solve Breakage Issues
Technical Information Paper
TIP 201
Issued: November 2004
Supercedes: August 2000
Toshihiko Ono
Corning Japan K. K., Shizuoka Technical Center
12117, Obuchi, Osuka, Ogasa, Shizuoka, 4371397, Japan
the elimination of the origin and/or reducing the tensile
stress. However, this solution can be applied only if
location of origins and the kind of the tensile stresses
are known.
R. A. Allaire
Corning Incorporated, Science and Technology
Corning, NY, 14831, USA
Biography
T. Ono received his B. S. and M. S. degrees in
inorganic chemistry from Nagaoka University of
Technology, Niigata, Japan, in 1988 and 1990,
respectively. In 1990, he joined the Shizuoka
Technical Center of Corning Japan K. K. where he has
been engaged in research and development of the
finishing technologies of LCD glass substrate and
other glasses. He has also proided extensive fracture
analysis support to resolve breakage problems in
Customer processes.
Abstract
Breakage of glass substrates in LCD manufacturing
processes can cause serious problems of productivity
and product quality/reliability. It is known that the
mechanism associated with breakage is crack
propagation by tensile stress concentration at a
damaged point on the glass, which serves as an origin
of the breakage [1]. Elimination of breakage requires
Fracture analysis can provide information of both the
tensile stress and the origin of breakage [2, 3]. This
analytical technique gives important information in
determining mechanism of breakage, such as direction
of crack propagation, type of the stress, direction of
impact and friction, location of the origin. All
important information is "memorized" on the broken
pieces and can be obtained through microscopic
observation. A process where an origin is created is
often different from the process where tensile stress is
applied. The breakage mechanism can be understood
by combining the information from fracture analysis
with process information.
The analysis method will be explained using actual
cases. Also, the application of the method for
optimization of cell-cutting process will be explained.
Glass Breakage
The mechanism of glass breakage is that crack
propagates by tensile stress that concentrated at the
origin, which is a small damage as cracks on the glass
surface, or in the glass body. The relation of the failure
stress and size of origin is explained with Eq. 1 [4],
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