Mechanical Specimen Grips

Mechanical wedge grips are often used for metal tensile testing. Hegewald & Peschke offers these clamping devices up to a load of 600 kN. The integrated adaptation system for compression plates, bending benches, load cells, etc. is particularly noteworthy.

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 thread specimen
- Testing of shoulder specimen
- Testing of screws
- Testing of tubes
- Testing of tapes