Table 1.

SMA Spring Parameters

Parameters	Symbols	Units	Values
Number of spring coil	N		13
Wire diameter	ds	mm	0.75
Spring diameter	Ds	mm	8.5
Twinned martensite shear modulus	GM	GPa	16.36
Austenite shear modulus	GA	GPa	25.06
Austenite start temperature	AS	°C	45.87
Austenite finish temperature	AF	°C	49.12
Martensite start temperature	MS	°C	42.37
Martensite finish temperature	MF	°C	38.17
Martensite constant	CM	MPa/°C	17.25
Austenite constant	CA	MPa/°C	12.81
Critical start shear stress	${\tau }_s^{cr}$	MPa	69.25
Critical finish shear stress	${\tau }_f^{cr}$	MPa	164.8
Maximum recoverable deflection	δL	m	0.08