This is a foil strain gauge with a polyimide backing and is designed for measuring stress in the optional direction in a plane stress field. It detects stress in the gauge axial direction regardless of the shearing strain. This gauge is available for three materials: mild/ferritic steel (Poisson's ratio=0.285), stainless steel SUS304 (Poisson's ratio=0.305), and aluminium (Poisson's ratio=0.330).
| Main Test Materials | Metal | Materials Backing | Polyimide |
|---|---|---|---|
| Operating Temperature | -20 to +200°C | Materials Element | Cu-Ni alloy foil |
| Compensation range | +10 to +100°C | Strain limit | --- |
| Bonding adhesive | NP-50 CN,C-1 |
Fatigue life at room temp. | 1×106 (±1500×10-6) |
Single element(G.F. 2.1 approx.)
| gauge pattern | type | gauge length (mm) |
gauge width (mm) |
backing length (mm) |
backing width (mm) |
resistance (Ω) |
poisson's ratio of specimen |
|---|---|---|---|---|---|---|---|
 |
SFA-285-11 | 4 | 3 | 9 | 6 | 120 | 0.285 |
| SFA-305-17 | 4 | 3 | 9 | 6 | 120 | 0.305 | |
| SFA-330-23 | 4 | 3 | 9 | 6 | 120 | 0.330 |