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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 600 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 (Reproduceable 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 reproducable 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
    • Testing of tubes
    • Testing of tapes
    • Hot tensile tests
 



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