Instron® biaxial and averaging axial clip-on extensometers are typically used for testing advanced composites, rigid plastics, and metals. In all of these extensometers, average axial strain is determined from independent strain measurements from both sides of the specimen. The use of average axial strain corrects for any specimen bending due to misalignment for a consistent and accurate determination of modulus.
By integrating a transverse strain transducer, the extensometer can simultaneously measure average axial and transverse strain, allowing the determination of Poisson’s ratio and in-plane shear strain. With a robust design, these extensometers provide reliable operation under demanding conditions and can be used in temperatures ranging from -200°C to +200°C (-328°F to +392°F).
These extensometers meet the calibration requirements of ASTM E83 B-1, ISO 9513 Class 0.5, and ISO 527 (Annex C).
Biaxial Clip-On Extensometers
Single Average Axial Strain Output Models
| Axial Gauge Length | Axial Strain | Catalog Number |
|---|---|---|
| 25 mm | -2% to +5% | 2650-561 |
| 50 mm | -1% to +2.5% | 2650-563 |
| 1 in | -2% to +5% | 2650-565 |
| 2 in | -1% to +2.5% | 2650-567 |
Two Independent Axial Strain Output Models
| Axial Gauge Length | Axial Strain | Catalog Number |
|---|---|---|
| 25 mm | -2% to +5% | 2650-571 |
| 50 mm | -1% to +2.5% | 2650-573 |
Averaging Axial Clip-On Extensometers
Averaging axial clip-on extensometers measure axial strain on opposite sides of the specimen. These models provide a single averaged axial strain output.
| Axial Gauge Length | Axial Strain | Catalog Number |
|---|---|---|
| 25 mm | -2% to +5% | 2650-560 |
| 1 in | -2% to +5% | 2650-564 |