Experimental Design Validation of Tilting Calibration Mechanism by Using Shape Memory Alloy Spring Actuator

Table 2

Specifications of the SMA spring and helical coil spring (: martensite start temperature, : martensite finish temperature, : austenite start temperature, and austenite finish temperature).

Spring type	Compression
SMA spring
Wire diameter (mm)	1.5
Spring diameter (mm)	10.3
Free length (mm)	26
Typical force (N)	10–15
Typical stroke (mm)	8–12
Activation temperature (°C)	95–100
, , , (°C)	75, 60, 95, 105
Helical coil spring
Wire diameter (mm)	1.2
Spring diameter (mm)	16
Free length (mm)	50
Spring constant (N/mm)	0.5
Maximum load (N)	10.8
Allowable strain (%)	45