Extensometers for materials testing
Bi-Axial or Axial Averaging Extensometers – Model 3560
36 EXTENSOMETER MODELS are available in many thousands of variations. Our focus on helping customers has led to the development of models to cover nearly any test method.
WITH EPSILON’S 20+ YEAR HISTORY OF SERVICE
to the materials testing community, you know we will be there to stand behind our products when your critical application requires it.
Operation of these, and all of Epsilon’s extensometers, are
VERIFIED TO APPLICABLE STANDARDS SUCH AS ASTM E83 OR ISO 9513
using in-house calibration systems that are calibrated with Epsilon’s laser interferometer system.
This extensometer is ideally suited for testing anisotropic materials such as advanced composites as well as for general purpose tests like determining Poisson’s ratio. The Model 3560BIA uses a design unique to Epsilon, where the knife edges remain parallel during the displacement. This approach greatly reduces crosstalk between axes and allows use on round or flat specimens with equal ease. These extensometers are very easy to mount. Integral springs hold the unit on the test sample. The parallel multiple flexure design makes these units very durable.
The Model 3560AVG reads axial strain only as a single averaged output. It may also be supplied with two independent outputs, one measurement from each side of the specimen. This set-up is most commonly required when an indication of specimen bending is desired. The second version, the Model 3560BIA, includes both the averaged axial strain and the transverse strain. Again, this may also be configured as dual independent axial readings, which results in a three channel extensometer.
The Model 3560 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. Most often they are connected to a test machine controller. The signal conditioning electronics for the extensometer is typically included with the test machine controller or may often be added. In this case the extensometer is shipped with the proper connector and wiring to plug directly into the electronics. For systems lacking the required electronics, Epsilon can provide a variety of solutions, allowing the extensometer output to be connected to data acquisition boards, chart recorders or other equipment.
- Multiple sets of dual flexures and mechanical stops allow testing through failure and provide a rugged unit.
- Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system.
- Includes the Epsilon Shunt Calibration System for on-site electrical calibration.
- Rugged, dual flexure design for improved performance.
- Knife edge mounting and parallel displacement allows mounting on round or flat specimens. Much easier to mount than designs using conical points (especially on thin flat specimens and round ones).
- Self-supporting on the specimen.
- High accuracy and minimal crosstalk between channels.
- Includes high quality foam lined case and spare set of tool steel knife edges.
Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.
Output: 2 to 4 mV/V, nominal, depending on model
Accuracy: Standard configurations meet ASTM E83 class B-1 and ISO 9513 class 0,5 requirements for accuracy in the axial direction. A test certificate is included. All standard units have linearity of 0.15% full scale measuring range or better in the transverse direction.
Linearity: ≤0.15% of full scale measuring range, depending on model
Temperature Range: Standard (-ST) is -40 °C to +100 °C (-40 °F to 210 °F)
Cable: Integral, ultra-flexible cable, 2.5 m (8 feet) standard
Specimen Size: Works with samples 2.5 to 25 mm (0.1 to 1 inch) width or up to 15 mm (0.6 inch) diameter
Operating Force: 30 to 50 g typical
Crosstalk: Less than 0.5%
Click table options to configure
|Average Axial Model||AVG||AVG|
|Biaxial Model (includes Transverse)||BIA||BIA|
|mm or inches||#|
|% strain (axial) / mm or inches (transverse)||#|
|±5% / ±0.5 mm or ±0.025 in||-005³||005|
|±10% / ±1.0 mm or ±0.050 in||-010³||010|
|-270 °C to 100 °C (-454 °F to 210 °F)||-LT||LT|
|-40 °C to 100 °C (-40 °F to 210 °F)||-ST||ST|
|-40 °C to 150 °C (-40 °F to 300 °F)||-HT1||HT1|
|-40 °C to 200 °C (-40 °F to 400 °F)||-HT2||HT2|
|-270 °C to 200 °C (-454 °F to 400 °F)||-LHT||LHT|
²50 mm and 2.0 inch gauge lengths are only available in 5% axial measuring ranges.
³If the gauge length is ordered in mm units, then the transverse measuring range will be in mm. If the gauge length is ordered in inch units, then the transverse measuring range will be in inches.
Additional axial / transverse measuring range combinations are available, such as ±5% axial with ±1.0 mm transverse, and ±10% axial with ±0.5 mm transverse. Contact Epsilon for details.