Hydraulic grips are a robust and versatile solution for tensile testing of high-strength materials. It can be used in both static and dynamic materials testing applications – from 20KN to 500 kN force capacity for dynamic tests, and up to 600 kN for static tests.

These hydraulic wedge grips are used in materials testing machines to transmit tensile and compression loads to specimens. They are suitable both for static tensile and compression tests and for dynamic tests in the pulsating tensile/compressive stress range under alternating load. 

Depending on the jaw surface, speci mens made of a wide range of materials can be gripped. Description of operation The grips operate on the 'body over wedge' principle.  During gripping the hydraulic pressure present causes an axial displacement of the body of the grip, producing a uniform lateral movement of the jaws towards the specimen. No axial displacements of any kind occur between specimen and jaws, eliminating unwanted axial forces. The symmetrical design and accurate guidance of the jaws in the body housing enable accurate, central, reproducible alignment of the specimen to the tensile axis, minimizing possible flexural stresses. The grips are designed for 210 bar and can be connected to 210-bar and 280-bar systems via the grip control unit. 

Wedge hydraulic stretching: Utilizing the wedge principle, the initial clamping force on the specimen is relatively small. During the testing process, as the testing force increases, the clamping force gradually increases.Automatic adjustment of alignment is achieved through the clamping device itself, allowing the specimen to maintain vertical stretching along the axis of the tensile testing machine, preventing the generation of off-axis stresses.The clamping device uses a wedge-shaped hydraulic clamp, with the clamp body made of medium carbon forged steel. 

The metal structure's flow lines nearly coincide with the mechanical flow lines after forging, resulting in a longer fatigue life for the clamp body. Both oil cylinders inside the clamp body have been honed, with a surface roughness of less than 0.4. 

The clamping blocks are made from quality alloy steel, with a hardness of 60-64 HRC after quenching, ensuring durability; the teeth of the clamping blocks utilize an improved herringbone design, which can reduce the size and holding length of the clamping blocks while ensuring secure gripping.

Hydraulic System: High pressure, lower pressure control. 

Load capacity: 20Kn, 50Kn, 100KN, 300Kn, 500KN, 600KN.