974L50 Planar Biaxial for Fatigue tests of Composites

974 Series servohydraulic planar biaxial test system enables static, dynamic, and fatigue tests on high strength square, rectangular and cruciform test samples. 974 systems are used for metal and composite fatigue and fracture and configured for higher forces and test speeds compared to the electrodynamic 574 series. They feature higher force capacities and higher speed capabilities compared to the 174 series.

Transducers include load and position encoder based measurements with both contacting and non contacting strain based extensometers available. The video extensometer is based on digital image correlation (DIC) technology. The mechanical extensometer is a two channel wheatstone bridge.

This system features high precision load and optional strain control on two synchronized axes which makes it possible to create controlled complex biaxial stress and strain test states. The system is programmed for tensile and tension-tension fatigue tests on flat test samples. Our four channel controller controls all four actuators independently to move in opposite directions on two axis perpendicular to each other.

Each system features four individually controlled servohydraulic actuators programmed to create synchronized yet independent control load and strain. They generate high precision states of stress along two axis (XY plane) in a biaxial mode. Tension, compression, and shear tests can be performed at a constant speed, constant load rate static tests, high speed, and high frequency load controlled fatigue tests. The actuator force rating, test stroke and operating frequencies are made to order and designed to match application requirements.


  • Test Space designed for customer samples and applications
  • Four channels of independent load, position and strain control
  • Actuator strokes to 100 mm (4 in)
  • 5,000 Hz data acquisition rate
  • Wide range of compatible optional accessories including tensile grips, compression and bend fixtures, environmental chambers, extensometers, etc.
  • 12 month warranty and customer support services


  • Actuator stroke made to application requirements
  • Strain measurement and control
  • Integrated standalone video extensometer with DIC technology
  • Accessories to match application - grips, fixtures, chambers

System Specifications

Model Max Force Capacity
974L50 50 kN (11,250 lbf)
974L100 100 kN (22,500 lbf)
974L250 250 kN (55,000 lbf)
974L500 500 kN (110,000 lbf)
974L2000 2 MN (450 kip)

974L Planar Biaxial for Metals Fatigue testing


High strength materials such as steel, aluminum, laminated composites, polymer reinforced composites, concrete and concrete reinforcements. Test types including fatigue, static and fracture tests such as fatigue crack growth.


Each system includes sample grips or test fixtures, strain measurement and strain control options, chambers and bathes to produce a controlled test media. We are experts at supplying turnkey systems with integrated fixturing and strain measurement instrumentation.

  • Environmental Chambers & Solutions
  • Extensometers
    • Contacting
    • Non contacting video
  • Grips and Fixtures compatible with environments