Description
The 2620 Series dynamic strain gauge extensometers are accurate lightweight units used for accurate direct measurement and closed-loop control of strain in a variety of static and high frequency cyclic materials testing applications.
Tensile, compressive, low and high cycle fatigue testing,
creep and stress relaxation as well as straight line (ramp) testing may be performed with the 2620 series dynamic strain gauge extensometer to a extensive range of national and international standards.
The extensometers are designed for use with
metals, composites, plastics, wood and other materials
exhibiting total strains up to ±50% of the original
gauge length. Variations of gauge length and percentage strain levels may be achieved by the addition of gauge length extenders.Integrated mechanical stops limit the amount of overtravel in the extensometers, enabling them to survive specimen rupture without damage.The 2620 extensometers are immersible in a range of fluids (acetone, mineral and silicone oils, alcohol and similar cooling/heating fluids) and can be quickly and
easily calibrated.
Principle of Operation
The 2620 Series extensometers are strain gauge units.The flexural element is a special alloy operating beam with fatigue certified foil gauges bonded to it.
The gauges are arranged in a fully active four-arm Wheatstone bridge circuit. It is mounted in a lightweight frame and accurately follows the strain
amplitudes applied to it.