Extensometer

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Extensometer An instrument for measuring the extension of a body, especially for measuring the elongation of bars of iron, steel, or other material, when subjected to a tensile force.
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Century Dictionary and Cyclopedia
    • n extensometer An apparatus for measuring minute degrees of expansion or contraction in metal bars under the influence of temperature or under strain. See expansion.
    • n extensometer In the instrument devised by Lavelle, a metal rod is surrounded by a steam-jacket whose temperature is indicated by two thermometers. The lower end of the rod rests at the bottom of the jacket, while the upper end passes through a movable metal cap which acts as a support for a spherometer (not shown in cut), by means of which the expansion of the rod is accurately measured.
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Etymology

Webster's Revised Unabridged Dictionary
Extens,ion + -meter,

Usage

In literature:

The latter used a recording deflectometer and two recording extensometers.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3" by Various
Instruments for this purpose are called barbarously "extensometers," and many different kinds have been devised.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2" by Various
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In news:

In materials and component testing the range of applications where extensometers are used is extremely diverse.
This schematic diagram shows the operating principles of various extensometers .
This is a combination of fully automatic feeler arm extensometers , with dual averaging axial and transverse strain extensometer .
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In science:

In addition, Kemper et al. (2005) used an extensometer to measure the average strain for the gage area that may have interfered with the mechanical response of the samples.
Tensile material properties of human rib cortical bone under quasi-static and dynamic failure loading and influence of the bone microstucture on failure characteristics
Although the strains were not measured using the same methods for all these studies (extensometer or non contact optical measurements), it makes sense that the effective modulus appears smaller for the rib bones.
Tensile material properties of human rib cortical bone under quasi-static and dynamic failure loading and influence of the bone microstucture on failure characteristics
Apart from a few deep mines outfitted with extensometers, active rock strain must be deduced from surface methods such as InSAR (satellite-generated Interferometic Synthetic Aperture Radar) and GPS (Global Positioning System) data.
Reference Design Project Book: NUSEL-Homestake
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