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AllroundLine Z050TH with Type 8404 wedge grips, Fmax 50kN

Wedge-grip features

Wedge grips consist of a solid body with interchangeable jaw inserts or fixed jaws, together with an operating unit for opening and closing the grip.

  • Wedge grips are ideally suited to specimens prone to shrinkage, as they automatically re-tighten, compensating for decreasing specimen thickness.
  • Wedge grips close symmetrically, automatically positioning the specimen in the tensile axis and eliminating the need for thickness adjustment.
  • Large clamping length and good jaw guiding properties allow contact pressure on the specimen to be kept low.
  • High temperature resistance and low overall height make them ideal for use in temperature chambers.Opens internal link in current window

Lever principle wedge grips

'Lever' operating principle

Wedge grips operating on this principle are self-tightening. During clamping a pre-load is applied to the specimen via operation of the lever and a spring. However, it is only during tensile loading that the main gripping force is attained via the wedge effect. The gripping pressure maintains a constant relationship to the tensile force through displacement of the wedges. The advantage of grips of this type is that the test can be performed very quickly and does not require the operator to exert too much force.

Wedge grips with ’body over wedge’ operating principle

'Body over wedge' operating principle

Wedge grips operating on this principle apply a greater pre-loading force on clamping. The pre-load applied to the specimen is transmitted to the jaws via the body of the grips using a lead screw. In this case also the main gripping force is not attained until during tensile loading (via the wedge effect). Grips of this type have two significant advantages: specimens inclined to slippage are gripped more firmly right from the beginning and grip-to-grip separation remains constant, even if thickness varies from specimen to specimen. In addition, strain-rate control to ISO 6892-1 (2009) Method A (closed loop) and ASTM E 8 (2009) Method B can be applied with greater precision.

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