CLEVIS GRIPS FOR FRACTURE MECHANICS
2780 Series Compact Tension Fixture
2780 Series Compact Tension Fixture
Instron® fracture mechanics fixtures are suited to static and dynamic testing of compact tensile specimens in accordance with the following standards: ASTM E399, ASTM E647, ASTM E1820.
Principle of Operation The upper and lower grips are identical and attached to the specimen by means of clevis pins. The two grips are aligned during setup using the supplied alignment fixture and secured with a pre-load in that alignment. Crack growth results are obtained using a crack opening displacement (COD) gauge to measure displacement, measuring the opening of the notch during loading. The retaining tab ensures that the clevis pins are safely inserted and remain in place during the test.
Application Range • Types of loading - Static or fatigue • Specimen geometries - Compact tension CT 12.5 and 25 mm • Fracture toughness, J-integral, crack growth & R-curve COMPACT TENSION FIXTURES FOR FRACTURE MECHANICS Catalog Number
Dynamic Capacity
Static Capacity
Specimen Thickness
kN
kN
mm
2780-118
±10
+20
2780-119
±50
2780-120
±250
Testing Standards
Notes
12.5
ASTM E399, ASTM E647, ASTM E813, ASTM E1290, BS 7448
Attachment kits supplied, 8000-090 (x2) and piston rod extender T75HC-1001 (x1)
+100
25
ASTM E399, ASTM E647, ASTM E813, ASTM E1290, BS 7448
Attachment kits supplied, 8000-090 (x2) and piston rod extender T75HC-1001 (x1)
+500
50
ASTM E399, ASTM E647, ASTM E813, ASTM E1290, BS 7448
For use with chamber piston rod extender T75HC-1001 (x1) and attachment kit 8000-090 (x2)
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