Abstract :
Thermomechanical analysis of a refractory,
woven fabric composite was conducted using a multi-scale
analysis technique. The composite was made of carbons
and ceramic materials. The fibers were made of carbons
and the outer coating was made of a ceramic material. In
order to reduce the thermal stress in the carbon fibers and
the ceramic material caused by mismatch of coefficients of
thermal expansion between the two materials, a graphitized
carbon layer was introduced between the fiber and the
ceramic coating. For the multi-scale analysis, a new analysis
model was developed and used to bridge the microscale
characteristics, i.e. the constituent material level such
as carbon and ceramic materials, to the macro-scale
behavior, i.e. the woven fabric composite level. Furthermore,
finite element analyses were undertaken with discrete
modeling of the representative fibers, coating, and the
graphitized middle layers. Then, both multi-scale analytical
and numerical results were compared. In this study, thermal
stresses at the micro-level, i.e. in the fibers and coating
materials, as well as effective thermomechanical properties
of the refractory composites were computed using the
multi-scale technique
