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Choosing the right extensometer for materials testing applications.

The requirements for an extensometer are determined primarily by the characteristics of the material to be tested. This includes its shape and dimensions, test requirements, and the formal standards which must be met. These define the gauge length, accuracy, test sequence and environmental conditions.

However, the right choice of extensometer cannot be limited to the basic material characteristics, such as specimen dimensions, stiffness, strength and plasticity alone. It is also necessary to decide whether an extensometer can be connected directly to the specimen without influencing the load measurement or mechanically damaging the specimen itself.

Contact type extensometers measure extension extremely accurately and are very cost-effective. Non-contact extensometers are required when the specimen is sensitive to notching knife edges or when the extensometer might be damaged at specimen break.

In short, there is no such device as a universal extensometer. The large range of applications demands various, different devices.

Users of the company's testing equipment are said to benefit from the wide range of extensometers available, as well as expert advice and consultation, together with the possibility to carry out pre-testing in the applications laboratory before purchase to make sure that the optimum device is chosen for each testing application.

Zwick Roell Group

www.zwick.com
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Title Annotation:Instruments
Publication:Rubber World
Date:Sep 22, 2008
Words:205
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