It is well known that composite materials have a poor resistance to the damage caused
by the impact of foreign objects on their outer surface.
There are various methods for improving the impact damage tolerance of composite
materials, such as: fiber toughening, matrix toughening, interface toughening, throughthe-
thickness reinforcements and selective interlayers and hybrids. Hybrid composites
with improved impact resistance would be particularly useful in military and commercial
Hybridizing composites using shape memory alloys (SMAs) is one solution since
SMA materials can absorb the energy of impact through superelastic deformation or
recovery stress reducing the effects of the impact on the composite structure. The SMA
material may be embedded in the hybrid composites (SMAHC) in many different forms
and also the characteristics of the fiber reinforcements may vary, such as SMA wires
in unidirectional laminates or SMA foils in unidirectional laminates only to cite two
examples. Recently SMA fibers have been embedded in 2-D woven composites.
As part of this PhD work, the existing theoretical models for woven composites have
been extended to the case of woven SMAHC using a multiscale methodology in order
to predict the mechanical properties and failure behavior of SMAHC plates.
Also several parts of the model have been coded in MATLAB and validated against
results extracted from the literature, showing good correlation.
|Date of Award||1 Jun 2011|
|Supervisor||Michele Meo (Supervisor)|
- energy dissipation
- loading events
- memory alloys