Figure 6 represents the stress-strain characteristics at
20-40% strain in compression. This strain range was selected,
based on the expected operating conditions for a sensor application. The non-linear relationship of load-compression
curves (compressive stress vs. strain) of the composites from
this experiment agrees well with the result from homogeneous
compression of incompressible rubber which depends
on the amount of filler contents (Allen et al., 1967). In addition,
it was found from this study that the presence of metals
as the third phase in the composites containing 50 phr CB
affects the composite stiffness insignificantly.