Wire rosettes
Key features
Wire strain gages rosettes can be made with two (BA configuration) or three (CA configuration) sensitive grids. BA rosettes consist of two independent sensitive grids, oriented in different ways such as: V-type (0°-60° or 0°-45°) and L‑type (0°-90°). CA type rosettes consist of three independent sensitive grids, oriented at 0°-45°-90° or 0°-60°-120° and are intended for determination of complexly oriented deformations. EA type rosettes consist of five independent sensitive grids, well known also as chains of strain gages and are intended for determining the most deformed point. Gages are to be installed on the surface of the test object using ceramic cement adhesive or alumina flame spray method. Gages are provided on the temporary fiberglass-reinforced PTFE carrier, which is subject to removal during installation of the strain gage.
Characteristics
| Nominal parameters | Value |
| Sensitive grid material | FeCrAl, NiCr or PtW |
| Possible number of sensitive elements | 2, 3, 4 or 5 |
| Nominal strain gage base length, mm | 3-3.5 |
| Resistance, Ohm | 120-350 |
| Resistance deviation in batch, not more than | ±3% |
| Lead wire material | FeCrAl, NiCr or platinum-based alloy |
| Lead wire diameter, mm | 0.07-0.15 |
| Lead wire type | Ribbon or round |
| Lead wire length, mm | 50-300 |
| Temporary carrier | Fiberglass-reinforced PTFE |
| Types of BA configuration wire rosettes | T-type, L-type and V-type |
| Types of CA configuration wire rosettes | 0°-45°-90° or 0°-60°-120° |
| Types of EA configuration wire rosettes | Chains of strain gages |
| Fatigue life at ±650 ppm at 20°C, cycles | 106 |
| Bonding Methods | Ceramic Cement or Alumina flame spray |
| Type of measurements | Static and dynamic |
