Biaxial Clip-on

The Instron 2650 Series Biaxial Extensometers are ideally suited for testing a wide range of materials, including polymer matrix composites, metals, and plastics over a range of temperatures. Two sensors measure axial strain on opposite sides of the specimen and a third sensor measures transverse strain. The extensometers meet the calibration requirements of ASTM E83 class B1, ISO 9513 class 0.5, and ISO 527.

Principle Of Operation

These bi-axial clip-on extensometers use strain gauges for measurement and are constructed from high-strength aluminum, titanium, and stainless steel. All of the extensometers feature simple, single-handed operation which ensures consistent results and facilitates safe use within a temperature chamber. The extensometer incorporates automatic electrical calibration and transducer recognition including a unique digital serial number.

All of the extensometers measure the axial strain on both sides of the specimen. Versions are available that provide either a single averaged axial strain output or two independent axial strain outputs. In all cases, the use of average axial strain corrects for any specimen bending due to misalignment for the consistent and accurate determination of modulus. The independent output versions allow simultaneous monitoring of both; the average axial and the bending strain. Additionally, the extensometer includes a sensor that measures transverse strain allowing for the determination of properties such as Poisson's Ratio and the In-Plane Shear Modulus.

Conical points are provided as standard with the extensometer and are recommended for most composite materials. Other contact options are available: line contacts, which are recommended for use with soft materials such as thermoplastics; and vee profiles, which are most suitable for thin section test pieces.