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Body over Wedge

Hydraulic grips Download
Material
  • Metals
  • Fiber composite
Test load
  • 150 kN - 250 kN
Specimen shape
  • Flat specimens
  • Round specimens
Type of test
  • Tensile
  • Compression
  • Alternating load

Double acting and symmetrical gripping

The hydraulic grips are double acting and are used for symmetrical gripping.

Positively driven jaws enable reproducible gripping of the specimen. The symmetrical design and high degree of stiffness of the main body of the grips make them ideal for tests in which strict requirements are placed on the alignment of the specimen to the test axis.

Advantages & features

Advantages
Function description
Servohydraulic
Advantages of servohydraulics

Advantages

  • The constant gripping force allows for repeatable test results.
  • Reliable test results are guaranteed with the optimal interaction between the hydraulic power pack, the electronics, and the testing software. The force-zero control prevents unwanted forces on the specimen during the gripping process.
  • The specimen grip is suitable for alignment-critical applications, such as specimens sensitive to transverse tensile forces.
  • With the parallel gripping operation (no differential movement of the jaws) the test speed is transfered directly to the specimen.
  • Fast and easy insertion of specimen due to the ergonomic and open design.
  • An adjustable centering stop ensures precise test results, even with high specimen throughput rates.
  • When testing composite specimens for example, the specimen grip offers advantages due to easy cleaning.

Function description

The specimen grips are symmetrically closing wedge grips, which are opened and closed hydraulically. Only the outer casing is moved vertically via the hydraulics. The movement of the housing causes the wedge jaws to be pushed parallel to one another in a horizontal plane.

Servohydraulic

The body over wedge hydraulic grips for servohydraulic testing machines provide a high level of operating convenience.

When used with servohydraulic testing machines they are connected to the existing pressurized oil supply. A small power pack is required for use in static materials testing machines.

Advantages of servohydraulics

  • Suitable for static tensile and compression tests and for fatigue tests under pulsating and alternating loads
  • Optionally available for superimposed torsion loading
  • Nominal forces 25, 100, 250 and 500 kN
  • Interchangeable jaws for flat and round specimens of different dimensions
  • Radial jaw guides prevent unwanted axial stresses in the specimen
  • Open-sided design for easy specimen change
  • Adjustable gripping pressure for soft specimens such as wood and plastics
Hydraulic grips_body over wedge with AllroundLine Z250 and temperature chamber

Body over wedge hydraulic grips with AllroundLine Z250 and temperature chamber
Hydraulic grips_body over wedge with AllroundLine Z250 and makroXtens extensometer

Body over wedge hydraulic grips with AllroundLine Z250 and makroXtens extensometer
Hydraulic grips_body over wedge with AllroundLine Z100 and laserXtens extensometer

Body over wedge hydraulic grips with AllroundLine Z100 and laserXtens extensometer

Technical overview

Item No.0728651072868107286921
Type859485948594
Test load Fmax100100100kN
Operating principle/identificationWedge actionWedge actionWedge action
Operating pressure, max.210210210bar
Gripping force, max. at 210 bar168168206kN
Dimensions
Height (Opened)266345514 (lower), 902 (upper)mm
Outside diameter (at head)200200200mm
Gripping travelDependent upon the jawDependent upon the jawDependent upon the jaw
Opening width, max. with jaws
Flat jaws393939mm
Prism jaws242424mm
Gripping of the specimenThe specimen must be gripped with at least 2/3 of the jaw height
Weight per specimen grip, approx.62.556.693 (lower), 113.6 (upper)kg
Connection interfaceFlangeMounting studFlange
ConnectionØ TK 220Ø 60Ø TK 220mm
Coolant connection--Hose connector 1/8
Condensed water connection--Hose connector 1/8
Ambient temperature+4 ... +35+4 ... +35-70 ... +250°C
Scope of delivery222pieces
  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  2. For specimen grip up to 250 °C a coolant connection and a condensed water connection are required.
Item No.072871107288110719551
Type859485948594
Test load Fmax250250250kN
Operating principle/identificationWedge actionWedge actionWedge action
Operating pressure, max.210210210bar
Gripping force, max. at 210 bar478478478kN
Dimensions
Height (Opened)339.7408.7627 (lower), 931 (upper)mm
Outside diameter (at head)280280280mm
Gripping travelDependent upon the jawDependent upon the jawDependent upon the jaw
Opening width, max. with jaws
Flat jaws404040mm
Prism jaws303030mm
Gripping of the specimenThe specimen must be gripped with at least 2/3 of the jaw height.
Weight per specimen grip, approx.102113160 (lower), 179 (upper)kg
Connection interfaceFlangeMounting studFlange
ConnectionØ TK 220Ø 60Ø TK 220mm
Coolant connection--Hose connector 1/4
Condensed water connection--Hose connector 1/8
Ambient temperature+4 ... +35+4 ... +35-70 ... +250°C
Scope of delivery222pieces
  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
Wedge grips
Item No.10029191002920
Dynamic nominal force±25±25kN
Torsional moment Mmax±250±250Nm
Temperature range+4 to +35-70 to +250°C
Design pressure210210bar
Specimen diameter, max.1616mm
Specimen thickness, max.1414mm
Installation height1661mm
Specimen grip diameter110110mm
Weight per grip810kg
Connection sizeØ70; 6 x M8Ø70; 6 x M8
  • Specimen grips consist of 2 grip heads
  • Set of jaws and grip control unit additionally required
  1. Upon request: the height depends on the temperature chamber used.
Wedge grips
Item No.088933088935
Dynamic nominal force±100±100kN
Torsional moment Mmax--Nm
Temperature range+4 to +35-70 to +250°C
Design pressure210210bar
Specimen diameter, max.2424mm
Specimen thickness, max.26.526.5mm
Installation height2321mm
Specimen grip diameter200200mm
Weight per grip3167kg
Connection sizeØ105, 6 x M10Ø 105; 6 x M10
  • Specimen grips consist of 2 grip heads
  • Set of jaws and grip control unit additionally required
  1. Upon request: The height depends on the temperature chamber used.
Wedge grips
Item No.088934088936
Dynamic nominal force±250± 250kN
Torsional moment Mmax-Nm
Temperature range+4 to +35-70 ... +250°C
Design pressure210210bar
Specimen diameter, max.3030mm
Specimen thickness, max.3030mm
Installation height3251mm
Specimen grip diameter280250mm
Weight per grip90kg
Connection sizeØ165; 12 x M16
Test load Fmax, dynamic± 250
Torque Mmax-
Connection dimensionØ 165; 12 x M16
Weight per specimen grip190
Recommended hydraulic oilTo ISO 3448
Kinematic viscosity at 40 °CApprox. 46 mm2/s
Scope of delivery
Specimen holder with rod2
  • Specimen grips consist of 2 grip heads
  • Set of jaws and grip control unit additionally required
  1. Upon request. The height depends on the temperature chamber used.

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Downloads

Name Type Size Download
  • Product information: Hydraulic grips for body over wedge, Fmax 100 kN PDF 608 KB
  • Product information: Hydraulic grips for body over wedge, Fmax 250 kN PDF 834 KB
  • Product information: Hydraulic wedge grips, 25 kN, for servohydraulics PDF 360 KB
  • Product information: Hydraulic wedge grips, 100 kN, for servohydraulics PDF 616 KB
  • Product information: Hydraulic wedge grips, 250 kN, for servohydraulics PDF 349 KB
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