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Home >> Products >> Test Fixtures >> Tensile >> Hydraulic Wedge Tensile test Grips

Hydraulic Wedge Tensile test Grips

100KN ~ 600KN, tension test

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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.

ISO 14273 Tensile Shear Test for Resistance Spot and Embossed Projection Welds –

ISO 14273 Resistance welding — Destructive testing of welds — Specimen dimensions and procedure for tensile shear testing resistance spot and embossed projection welds.

ISO 14273 defines how to prepare, grip, load, and report the destructive lap-joint tensile shear test used to measure the maximum force a resistance spot weld or embossed projection weld can carry in shear.

ISO 14129 In-Plane Shear Stress/Shear Strain Response Test –

ISO 14129: Fibre-reinforced plastic composites - Determination of the in-plane shear stress/shear strain response, including the in-plane shear modulus and strength, by the +/- 45° tension test method

ISO 14129 in-plane shear strength for composites of ± 45° tension test is use tension test method to determine the shear strength, stress etc., tensile test of a ±45° laminate is used to determine the in-plane shear response of polymer matrix composite materials. Uniaxial tensile force is applied to a flat test specimen up to 5% shear strain to investigate the in-plane shear stress/strain response, and critical mechanical materials properties including shear modulus and shear strength. Composite materials addressed in this standard include thermoset and thermoplastic matrix laminates in the form of unidirectional layers or fabrics, with the fibres oriented at ± 45° symmetrical to the main specimen axis. The ± 45° in-plane shear test is performed by placing a test specimen in the grips of either a servohydraulic or an electromechanical testing machine and subjecting it to controlled tension load up to 5% shear strain. The specimen response can be measured with a contacting or non-contacting extensometer, or strain gages.

Test sample size: 250mm length, 25mm width, 2mm thickness.

Machine recommend: UnitedTest electronic Universal testing machine 50Kn, 100KN.

Test fxiture recommend: UnitedTest hydraulic wedge tensile grips.

ASTM D3518 In-Plane Shear Test for Polymer Composites –

ASTM D3518 Standard Test Method for In‑Plane Shear Response of Polymer Matrix Composite Materials by Tensile Test of a ±45° Laminate

ASTM D3518 determines the in-plane shear response of continuous-fibre polymer-matrix composites by pulling a balanced, symmetric ±45° laminate in uniaxial tension and converting axial/transverse strains into shear strain. It provides shear stress‑strain curves, chord shear modulus, maximum shear stress and offset shear strength for composite laminates.

ASTM D2294 Metal-to-Metal Adhesive Shear Creep Test –

ASTM D2294 Standard Test Method for Creep Properties of Adhesives in Shear by Tension Loading (Metal-to-Metal)

ASTM D2294 measures time‑dependent shear creep of a metal‑to‑metal adhesive joint. A standard lap‑type specimen is loaded in tension so that the adhesive bond sees essentially shear; once the target load is reached, a spring‑loaded creep apparatus holds the load statically while the specimen is held at a controlled temperature (and optionally humidity/environment). Creep deflection at the bondline is tracked versus time.

ASTM D3039 Tensile Testing of Polymer Composites –

ASTM D3039 Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials

ASTM D3039 defines a unified procedure to measure the in-plane tensile properties of high-modulus fiber-reinforced polymer matrix composites (PMC). It applies exclusively to continuous or discontinuous fiber-reinforced laminates that are balanced and symmetric with respect to the test direction.

ASTM D5766 open-hole tensile test for composite laminates –

ASTM D5766 Standard Test Method for Open Hole Tensile Strength of Polymer Matrix Composite Laminates

ASTM D5766 for measuring the open‑hole (notched) tensile strength (OHT) of a multi‑directional fiber‑reinforced polymer composite laminate — essentially a ASTM D3039 tensile coupon with a precision‑machined hole in the middle, pulled to failure in uniaxial tension.It quantifies the notch effect from a central through‑hole, simulating fastener cut‑outs in real composite structures.

ASTM D7615 Open-Hole Fatigue Testing for Polymer Matrix Composite Laminates –

ASTM D7615 Standard Practice for Open-Hole Fatigue Response of Polymer Matrix Composite Laminates

ASTM D7615 converts the static open-hole tensile (OHT) and open-hole compressive (OHC) strength tests into constant-amplitude uniaxial fatigue tests, for continuous-fiber-reinforced polymer matrix composites whose laminate is symmetric and balanced with respect to the test direction. Loadings may be tension–tension, compression–compression, or reversed tension–compression. Either engineering stress or applied force may be used as the constant-amplitude fatigue variable. It adapts static open‑hole tension/compression test protocols to cyclic fatigue conditions, capturing fatigue life, stiffness degradation, damage accumulation and failure modes for notched composite coupons with a central drilled hole.