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Hydraulic Wedge Tensile test Grips

Hydraulic Wedge Tensile test Grips

100KN ~ 600KN, tension test

Hydraulic wedge test 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.

General introduction

Hydraulic wedge test 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. 

Hydraulic Wedge Tensile test Grips

Hydraulic System: High pressure, lower pressure control. 

Hydraulic Wedge Tensile test Grips




Key Features

  • Operating Principle

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.

Main technical specification

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


Standard

ASTM D3479 Tension-Tension Fatigue of Polymer Matrix Composites

ASTM D3479 — Standard Test Method for Tension-Tension Fatigue of Polymer Matrix Composite Materials

ASTM D3479 determines the fatigue behavior of polymer matrix composite materials subjected to tensile cyclic loading. It answers the question with quantitative, reproducible data that when polymer matrix composites (PMCs) replace metals in aircraft wings, wind turbine blades, automotive structures, and sporting goods, engineers face a critical question: how many millions of tensile load cycles can a composite laminate survive before fatigue failure?

ISO 16525-5 Test: Definitive Guide to Shear Fatigue Testing of Isotropic Electrically Conductive Adhesives

ISO 16525-5 — Adhesives — Test methods for isotropic electrically conductive adhesives — Part 5: Determination of shear fatigue

In the electronics industry, isotropic electrically conductive adhesives (ICAs) have become a critical interconnection technology — replacing traditional solder in applications ranging from semiconductor die attachment to flexible printed circuits. But here's the challenge: these conductive joints must survive millions of thermal and mechanical cycles while maintaining both their mechanical integrity and electrical continuity. 

ISO 16525-5 specifies test methods using miniature specimens to measure the shear fatigue of a glued joint composed of isotropic electrically conductive adhesives and rigid adherends under specified conditions.

Unlike conventional structural adhesive fatigue tests (e.g., ASTM D3166), ISO 16525-5 is uniquely designed for conductive adhesives in electronic assemblies — where the joint must simultaneously maintain mechanical shear strength and stable electrical resistance throughout its service life.

ASTM D3166 Complete Guide to Adhesive Shear Fatigue Testing

ASTM D3166 — Standard Test Method for Fatigue Properties of Adhesives in Shear by Tension Loading (Metal/Metal)

ASTM D3166 is a standardized laboratory method for measuring the fatigue strength of adhesives in shear under cyclic tensile loading. It uses a single-lap-joint metal specimen and applies a sinusoidal axial load repeatedly until the bond fails. The result is an S-N curve (stress vs. logarithm of cycles), from which the "fatigue strength at 10 million cycles" is designated as the key design value. 

When structural adhesives replace welding or mechanical fasteners in aerospace, automotive, and industrial assemblies, a single question decides whether the bond will survive millions of load cycles: how long can the adhesive resist repeated shear stress before it fails?    

ISO 11003-2 Thick-Adherend Tensile Shear Test for Structural Adhesives

ISO 11003-2 Adhesives – Determination of shear behaviour of structural adhesives – Part 2: Tensile test method using thick adherends.

ISO 11003-2 determining the shear behaviour of structural adhesives in a single-lap bonded joint subjected to tensile loading. The unique feature is the use of thick, rigid metal adherends with a very short overlap length to achieve the most uniform shear stress distribution possible in the adhesive layer and minimize peel stresses and other secondary stress states that initiate premature failure. 

ISO 8513 Longitudinal tensile test for Glass-reinforced thermosetting plastic pipe

ISO 8513 Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods for the determination of the initial longitudinal tensile strength

ISO 8513 measure two core longitudinal tensile properties of glass-reinforced thermosetting plastic (GRP, also known as fiberglass-reinforced plastic FRP) pipes: Initial longitudinal tensile strength, Percentage ultimate elongation. IT only addresses tensile strength and break elongation; it explicitly excludes longitudinal tensile modulus testing, as multi-layer GRP pipe wall structures make precise strain measurement impractical.

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