Thermally induced interfacial stress states between fiber and matrix at cryogenic
temperature were studied using three-dimensional finite element based micromechanics.
Mismatch of the coefficient of thermal expansion between fiber and matrix, and
mismatch of coefficient of thermal expansion between plies with different fiber
orientation were considered. In order to approximate irregular fiber distributions and to
model irregular fiber arrangements, various types of unit cells, which can represent nonuniformity,
were constructed and from the results the worst case of fiber distributions
that can have serious stress states were suggested. Since it is difficult to measure the
fiber transverse coefficient of thermal expansion at the micro scale, there is an
uncertainty problem for stress analysis. In order to investigate the effect of error in
assumed fiber transverse coefficient of thermal expansion on thermally induced
interfacial stresses, systematic studies were carried out. In this paper, the effect of
measurement errors on the local stress states will be studied. Also, in order to determine
fiber transverse CTE values from lamina properties, a back calculation method is used
for various composite systems.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/3800 |
| Date | 16 August 2006 |
| Creators | Zu, Seung-Don |
| Contributors | Whitcomb, John D |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 4222849 bytes, electronic, application/pdf, born digital |
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