The SMA strain also goes up by enhancing the aspect ratio
of the base isolator. Fig. 2a shows the variation of SMA wire strain
by increasing the shear strain amplitude and the aspect ratio of the
rubber bearing. At 200% shear strain amplitude, the SMA wires in
all of the base isolators experience a strain greater than 10%. It
can be also observed that the strain induced in SMA wires will
not exceed 10% when the base isolator is subjected to shear strains
lower than 100%. However, at larger shear strains, the SMA wire in
the base isolator with high aspect ratio can experience as high as
27% strain.