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Coaxial extensometers

ASTM A370
Main features
  • Applied directly to the specimen up to the failure
  • Measures extension of both elastic and plastic stage
  • High precision electronic transducer
  • Ideal for reinforcing bars
General description
General description
Introduction
Extensometers used for measuring the extension of specimens in traction, particularly in the case of steel and brittle materials, are only able to detect strain during the first stage of the test, or rather, while the brittle materials conserve their elasticity as they have to be disconnected before failure. This simple and economic system fully satisfy these requirements because:
  • it is applied directly to the specimen
  • it remains connected until breakage
  • it measures extensions with high precision of both elastic and plastic stage and with the appropriate simple adjustment, it is connectable to almost all testing machines
  • it avoid markings on the test piece

Description
The extensometers are basically made from three separate aluminium tubular sections, joined telescopically to one another. The middle section, delimited by the larger diameter, determines the measuring base, which, as is well known, must be 5 times the diameter of the specimen (in the case of breaking point measurements). The two end sections consist of two mechanisms for gripping the specimen. One carries the electrical extensometer, the other an anvil.

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Technical specifications

Models 70-C0961/A2 70-C0961/B2 70-C0961/C2 70-C0961/D1
Measuring range dia.
Min/Max mm
5/11.5 11/18 17.5/26 26/36
Spacer(2) for spec.
dia. mm
5-6-8-10 12-14-16-18 18-20-22-25 25-28-30-32
Measuring base (1) 5 x d 5 x d 5 x d 5 x d
Transducer travel 30 mm 50 mm 50 mm 100 mm
Weight approx. kg 0.1 0.2 0.3 0.5
(2)Spacers for other specimen dia. are available on order
(1)d = specimen diameter

Ordering info

70-C0961/A2
Coaxial electronic extensometer for round specimens from 5 to 11.5 mm dia.

70-C0961/B2
Coaxial electronic extensometer for round specimens from 11 to 18 mm dia.

70-C0961/C2
Coaxial electronic extensometer for round specimens from 17.5 to 26 mm dia.

70-C0961/D1
Coaxial electronic extensometer for round specimens from 25 to 36 mm dia.

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