EXTENSOMETERS

2.4

The precise measurement or control of specimen deformation is a fundamental requirement in many materials tests. The use of crosshead or actuator movement to derive specimen deformation is often employed, but accuracy is limited by external influences such as system compliance and specimen deformation outside the nominal gauge length (in the tab ends for example). Extensometry provides a direct and accurate method for measuring and controlling specimen deformation by monitoring strain over a precisely defined gauge length. The Instron extensometry range includes many different types of extensometers to suit various specimens and applications. Each one is designed to provide the best possible accuracy. Instron has designed many custom extensometers and will discuss your extensometry requirements should you be unable to find a suitable device in the following pages. ÂŽ

Automatic Extensometers

Biaxial Automatic Extensometers

Averaging Axial Clip-on Extensometers

82-83

Dynamic Axial Clip-On Extensometer

84-85

Static Axial Clip-On Extensometers

86-88

LVDT Non-Separable Axial Clip-On Extensometers

89-91

Biaxial Clip-On Extensometers

92-93

Circumferential Extensometers

Connecting Cables for Extensometers 95 Crack Opening Displacement (COD) Gauges

Deflectometers

97-98

Deflectometer Accessories

High-Temperature Extensometers

100-105

LVDT and SLVC Units

106

Long-Travel Extensometers

107

Non-Contacting Video Extensometers 108-109 Digital Image Correlation

110-111

Knife Edges, Clips and Parts for Extensometers

112-113

Transverse Clip-On Extensometers

114

Instron

Published on Oct 31, 2018

Instron - Accessories for Materials Testing - Seventh Edition

1 min read

Digital Controller Accessories

Electronic or electrical devices that can be added to an existing controller include transducer conditioner channels for use with extensometry, analog outputs and firmware options. The type of controller you have determines the various features and capabilities that are available. In most cases the model number of your load frame defines the type of control electronics incorporated in your testing system. For example, model 5585 uses a 5500 series controller. If your system does not have any of the listed types of controller, please contact your local Instron® office to discuss your requiremen…

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Environmental Chambers

The Instron® range of environmental chambers provides extensive temperature testing capabilities for evaluating material properties under non-ambient testing conditions. A full range of complementary grips and pull rods is available. We are also able to produce custom chambers to suit your application. Please contact us for more information.

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Furnaces

Very high-temperature properties of materials are a vital concern in many applications such as power generation, aerospace and automotive. Our standard range of furnaces covers temperatures up to +1600 °C in air, with engineered solutions available to cater for height and width variants. A wide range of grips, pull rods and extensometers is available to provide the complete solution to your high temperature testing requirements.

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General Purpose Compression Accessories

Compression platens and anvils are available in a range of sizes and force capacities to suit applications from rigid foam to concrete. Optional self-aligning spherical seatings are available for most platens where precise parallelism is needed.

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General Purpose Fatigue Grips

The Instron® range of fatigue grips are suitable for a wide range of materials and specimen types. From simple compact tension fixtures for pre-cracking and fracture toughness studies through to reverse-stress hydraulic wedge grips, the choice is extensive. A full range of complementary accessories, such as jaw faces and alignment devices, is available to ensure the best possible gripping performance.

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General Purpose Flexure Fixtures

Flexure or bend tests are widely used to determine stiffness and yield properties of plastics, metals and similar rigid materials. The Instron® range of flexure fixtures covers both three and four-point loading in a variety of force capacities and spans.

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Load Cells

Load cells convert the force experienced by the specimen into an electrical signal that is used by the electronic controller to precisely monitor, report or control the force. Materials testing is unlike an application such as weighing because not only are forces changing dynamically, but they are often not applied in a truly axial fashion. In order to minimize the force measurement errors that can result from these effects, Instron® supplies a range of different load cells, each designed specifically for materials testing. For example, the patented Dynacell™ range of fatigue-rated load cells …

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Computer Hardware and Digital Interfaces

Software has become an integral part of many modern materials testing systems. When the time comes to take that first step in computerizing your system or to update your existing PC hardware we recommend that you contact us to discuss the best route forward. There are software and hardware compatibility issues that need careful consideration to ensure successful installation. All PC systems supplied by Instron® come with a full Instron warranty and have been thoroughly checked for software and hardware compatibility. When ordered with the PC, interface cards are also installed and checked. Com…

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Specimen Measuring and Preparation Tools

Instron® supplies specimen marking devices of various types, as well as a range of specimen measurement units that can be connected directly to compatible systems to allow downloading of specimen dimensions with

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Torsional and Axial Torsional Grips

Torsion grips are designed to transmit torsional forces to the specimen and usually employ either a collet or socket-style gripping arrangement. Specific types of testing systems are required to apply torsional loading, so please check that your system includes torsional capability. Typical applications include medical devices, packaging, and fasteners. Axial torsional grips are used in conjunction with systems able to apply both torsional and axial loads to a specimen simultaneously. Applications include biomedical testing of prostheses.

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Engineered Solutions

The huge variety of materials and testing applications means that we are frequently required to design special solutions to meet unique testing needs. If our standard products do not meet your requirements, a team of highly-skilled and experienced engineers is available to design and produce solutions to your specific problems. Whether you need a special jaw face or a furnace system for high temperatures, you will find that we have the experience and resources to do the job to your requirements and expectations. Our experience in the specification and manufacture of engineered solutions means …

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Application Overviews - Plastics

Polymers are utilized in virtually every facet of human activity and industry - from packaging to automotive, electronics to healthcare, and construction to aerospace. The list is endless. Replacement of traditional materials such as metals with polymers is largely due to the cost-effectiveness and many superior attributes of plastic. The electrical insulation, color, strength, and high-speed molding qualities have made plastics well-suited for electrical appliances ranging from handheld mixers and hair dryers to power tools and automotive components. The aircraft and aerospace industries have…

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Application Overview - Elastomers

Elastomers are used in varying applications from automotive in the form of tires, to household applications, gloves for example. However, there are many others, including hoses, drive belts, seals, building products, anti-vibration mountings, medical products and leisure goods. They range from natural latex rubber to highly-engineered synthetic materials for critical engineering applications. Elastomers typically show characteristics of high elongation, energy absorption, and can experience violent failures. Mechanical characterization of the properties of elastomers is critical in the develop…

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Application Overviews - Textiles

The textile industry manufactures fabrics, cords, yarns and individual fibers, all of which may be either natural or synthetic materials. Testing of textile properties is widely used to determine tenacity, elongation, tensile strength, and many other parameters. Many test specifications relate to the end use, including the testing of tire cord for strength and adhesion, grab tests, fabric seam slippage, tear, and puncture tests. Standardization of test methods is well established in the textile industry, with specifications requiring control of parameters including temperature and humidity. So…

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Application Overview - Composites

Composite materials are composed of two or more distinct phases, usually a reinforcing fiber within a binder or matrix. The concept of increasing strength and toughness by adding fibers to binders is very old; mud bricks containing straw or animal hair are among the first examples. However, it is only relatively recent that composites as we currently recognize them have become widely used. Today, fiber-reinforced composites are at the heart of the materials revolution. Composites have advantages of design flexibility, high stiffness and strength, low weight and cost savings. One unique attribu…

1 min read

Digital Controller Accessories

1 min read

Environmental Chambers

1 min read

Furnaces

1 min read

General Purpose Compression Accessories

1 min read

General Purpose Fatigue Grips

1 min read

General Purpose Flexure Fixtures

1 min read

Load Cells

1 min read

Computer Hardware and Digital Interfaces

1 min read

Specimen Measuring and Preparation Tools

1 min read

Torsional and Axial Torsional Grips

1 min read

Engineered Solutions

1 min read

Application Overviews - Plastics

1 min read

Application Overview - Elastomers

1 min read

Application Overviews - Textiles

1 min read

Application Overview - Composites

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