Are wedge grips suitable for tests of brittle material? Explain?
Application Range :
Type of loading: Static or dynamic, reverse stress.
Specimen material: Metallics, plastics, composites.
Specimen geometries: Round and flat section using appropriate optional jaw faces.
*Hydraulic wedge action grips may be used in static or dynamic materials testing applications, interchangeable wedge-shape grip faces accommodating either flat or round specimens.
The grips maintain a constant gripping force on the specimen regardless of the test forces acting upon it, as long as there is hydraulic pressure to the grips.
Principle of Operation
Each grip functions independently of the other,
an external hydraulic supply providing pressure to both open and close the grips.
When gripping pressure is applied, the relative vertical position of the specimen/jaw faces remains unchanged to prevent specimen load generation during the gripping process.
Once the grip faces contact the specimen the hydraulic pressure produces a vertical force on
the grip head. The grip force will remain constant as the design automatically compensates for specimen thickness changes.
*Mechanical wedge action grips may be used in static or dynamic materials testing applications, interchangeable wedge-shape grip faces accommodating either flat or round specimens.
The grip is designed to allow test specimens to be securely gripped without introducing axial
pre-loading to the specimen. This is achieved by using jaw faces that move in a horizontal
direction only, relative to the specimen.
Principle of Operation :
Each grip is mechanically operated, gripping force being applied via movement of the grip body relative to the wedge shaped jaw faces. This movement is induced by the tightening of four socket cap screws on the underside of the grip head.
Each jaw face is located in the grip body by two extension springs, which allow the jaw faces to release the specimen after testing.
The grip body wedge area is fitted with jaw guides, to ensure that the jaw faces remain
square to each other and to the specimen. ]
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