Mechanical Specimen Grips
Hegewald & Peschke offers a wide range of mechanical grips for tensile tests. This includes both form-fit and force-fit specimen grips, which can be used for a wide range of materials, specimen shapes and temperature ranges.
Mechanical wedge type grips are often used for metal tensile testing. A special feature is the integrated adaptation system for compression plates, bending benches, load cells, etc. This avoids time-consuming conversion of the testing machine for changing tasks.
Force-Fit Grips
Wedge type grips
- Self-tensioning
- Field of application: Up to 250 kN, metals
Advantages:
- Up to high forces
- Clamping force increases during testing
Disadvantages:
- Heavy
- Only symmetrical clamping possible
- Clamping and pre-clamping force cannot be adjusted
- Spring back after brittle fracture
Screw type wedge action grips
- External tensioning
- Field of application: Up to 250 kN, metals
Advantages:
- Symmetrical and asymmetrical clamping
- Adjustable clamping force (Reproducible clamping forces can be reached with a torque wrench)
- Up to high forces
- Frictional fixation after fracture
Disadvantages:
- Heavy
Vice grips
- External tensioning
- Field of application: Up to 20 kN, polymers (thermoplastic, duroplastic), foils, food,
Advantages:
- Light
- Symmetrical and asymmetrical clamping
- Adjustable clamping force
Disadvantages:
- Only for small forces
- Difficult to reach reproducible clamping forces
- Clamping force decreases during testing
Princer grips
- Self-tensioning
- Field of application: Up to 20 kN, elastomers, plastics, textiles
Advantages:
- Light
- Clamping force increases during testing
Disadvantages:
- Only symmetrical clamping possible
- Clamping and pre-clamping force cannot be adjusted
Form-Fit Grips Specimen holder for shoulder, screw and thread head testing
- Field of application: Clamping of tensile specimens that cannot be gripped directly with clamping jaws due to their size, geometry or structure
- For example suitable for:
- Testing of threaded-end specimen acc. to EN ISO 6892-1
- Testing of shoulder-end specimen acc. to EN ISO 6892-1
- Testing of screws acc. to EN ISO 898-1
- Tensile test under wedge loading on finished
screws - Tensile tests for finished screws for determination of tensile strength Rm
- Tensile tests on full-size screws for determination of elongation after fracture Af and stress at 0.004 8 d non-proportional elongation Rpf
- Tensile test on screws with reduced robustness due to the head design
- Tensile test for screws with waisted shank
- Proof load test on finished screws
- Tensile test on drilled specimens
- Tensile test under wedge loading on finished
- Testing of tubes
- Testing of tapes
- Hot tensile tests
Application Videos for Mechanical Grips
Tensile Test with Wedge Type Grips
Tensile Test with Screw Type Wedge Action Grips
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