Clevis Grips for Fracture Mechanics

The Instron 2750 Series fracture mechanics grips are suited to static and dynamic testing of compact tension specimens in accordance with the following standards: 
  • ASTM E 399 
  • ASTM E 647 
  • ASTM E 813 
  • ASTM E1 290 
  • BS 7448

Principle Of Operation

The upper and lower grips are identical, and attach to the specimen by means of a clevis pin arrangement. The 10 kN and 50 kN grips require a set of adapters which provide for attachment to the load cell or actuator (via an appropriate attachment kit).Clevis pins are provided with spring clips or covers to prevent them from being shaken loose during testing.

Application Range

  • Type of loading: Static or dynamic (tension/tension)
  • Specimen material: Typically metallics
  • Specimen geometries: Compact tension (6.5 mm, 13 mm, 25 mm and 50 mm thickness)
Item Name Capacity Specimen Width Cat #
Clevis Grips For 12.7 mm (0.50 in) Thick Specimens. +/- 55 dynamic, +110 static kN +/- 12,000 dynamic +/-24,000 dynamic lbf 12.7 mm 0.5 in 2750-084
Clevis Grips For 25.4 mm (1.00 in) Thick Specimens +/- 55 dynamic, +110 static kN +/- 12,000 dynamic +/-24,000 dynamic lbf 25.4 mm 1.0 in 2750-083
Clevis Grips For 50.8 mm (2.00 in) Thick Specimens. +/- 160 dynamic, + 320 static kN +/- 36,000 dynamic, + 72,000 static lbf 50.8 mm 2.0 in 2750-088
Compact Tension Fixtures for 25mm wide Compact Tension Specimens ±50 dynamic, 100 static kN ±11,500 dynamic, 22,500 static lbf 25 mm 0.98 in 2780-119
Compact Tension Fixtures for 50mm wide Compact Tension Specimens ±250 dynamic, 500 static kN ±56,200 dynamic, 112,000 static lbf 50 mm 1.97 in 2750-120
Compact Tension Fixtures for 6.5mm and 12.5mm wide Compact Tension Specimens ±10 dynamic, 20 static kN ±2200 dynamic, 4500 static lbf 12.5 mm 0.49 in 2780-118
High Temperature Clevis Grips 0.8 @ 1000 deg.C kN 175 @ 1832 deg.F lbf 12.5 mm 2420C