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Tech Spotlight: Video Extensometers

From Shimadzu Scientific Instruments, Inc.
 

 
As a basic accessory for tensile testing, extensometers are used on nearly all engineering materials, including metals, polymers, plastics, composites, glass, ceramics, concrete, asphalt, and biomaterials. As such, the number of applications is infinite. The number of available devices is also very large; consequently, finding the perfect extensometer can be a difficult task. An extensometer must perform well in any condition without disturbing the sample. This is the basic challenge for users, and it involves three important factors. First, the extensometer must be fixed on the sample without modifying the shape and the surface of the sample. With a rigid sample, such as a steel or hard plastic, this task is relatively easy. However, when the sample is soft, the task becomes more challenging, as the weight and the clamping of the extensometer become important.
Product Announcements
Shimadzu Scientific Instruments, Inc. - SIE-560 Automatic Extensometer
Shimadzu's new automatic extensometer provides users with increased sensitivity, accuracy, and ease-of-use. Ideal for masuring sample reactions to applied loads - tension or compression – made... (read more)
United Testing Systems, Inc. - Extensometers, United Model EZ
Easy, quick, one-handed placement is the key to United's Model EZ Extensometer. Designed with a minimum number of moving parts, and "snap-on" mechanization, the unit combines simple operation with... (read more)
Zwick USA - VideoXtens Video Extensometer
Zwick has released its latest videoXtens video extensometer aimed at materials testing applications where it is impractical or inadvisable to make contact with the specimen. Able to simultaneously... (read more)
Anton Paar - XRK 900 Reactor Chamber from Anton Paar
XRK 900 is the only heating chamber for X-ray diffraction experiments on the market specifically designed for studies of solid state and solid state-gas reactions up to 900 °C and 10 bar. It is a... (read more)
CAS Data Loggers - New Expansion Module Allows up to 300 Inputs
The new dataTaker CEM20 Channel Expansion Module allows up to 300 analog input channels for temperature, voltage, 4-20 mA current, resistance, strain gauge and geotechnical sensors. (read more)
 
Topics of Interest
An extensometer is an instrument for measuring changes in length that are caused by application or removal of a force. The elongation of a specimen during load application can be measured directly... (Read More)
Monitoring of the actual residual bolt load after tightening is essential to ensure that leak-tightness goals are achieved and becomes an important part of the quality assurance process of achieving... (Read More)
5.0 PHYSICAL PROPERTIES What has preceded this section leads up to developing the physical properties of the ceramic that are needed to fill an application. This section is concerned with how these... (Read More)
2 POISSON'S RATIO When a material is stretched there is also contraction in the direction perpendicular to the direction of stretching. The ratio of the lateral contraction to the longitudinal... (Read More)
Overview In this Appendix equations are derived, following [1], to rigorously calculate true (Cauchy) stress and true strain for tests where cross-head displacement is measured for strain surrogate. (Read More)