Abstract
The four-point bend test is one of the most popular strength testing
methods used to test LCD panels. Traditionally, a panel is assumed to be either
a monolithic piece of glass or two independent pieces of glass sliding against
each other. This paper uses finite element analysis to show that a panel behaves
like a monolithic piece of glass in the epoxy region (near the edges) but
behaves like two pieces of glass at the center. Assuming a panel to be a monolithic
piece of glass may overpredict the stresses by a factor of two at the center.
Similarly, assuming a panel to be two pieces of glass may underpredict the
stresses by a factor of two at the edges. During four-point testing of a panel,
the stresses are not uniform in the load-span region and so finite element
analysis is required to obtain an accurate stress distribution.
© 2013 IEEE
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