This paper describes the design and application of a simple transducer developed by the Cement and Concrete Association to study the properties of reinforced and prestressed concrete structures. Minimal surface preparation and a simple method of fixing was required. The transducer was to be able to span any cracks that may develop in the specimen, have an output comparable with the Demec gauge, be capable of easy construction and repair. The transducer evolved was basically a clip gauge, and was made in three lengths: 50 mm, 100 mm and 200 mm. A flexible strip is used, mounted on two blocks with conical pins driven into them to provide a means of location to the Demec stand. The assembly is attached to the specimen by means of tension springs hooked into short lengths of aluminium angle bonded onto the specimen. A bridge circuit, energised by 5 V DC, is used to give full scale output of approximately plus or minus 10 millivolts corresponding to plus or minus 12700 microstrain. The author describes a calibration rig and shows that the transducers can be made to meet the specification for a grade C extensometer. (TRRL)

  • Availability:
  • Corporate Authors:

    British Society for Strain Measurements

    281 Heaton Road
    Newcastle-Upon-Tyne, NE6 5QB,   England 
  • Authors:
    • Cook, C F
  • Publication Date: 1980-7

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 113-119
  • Serial:
    • Strain
    • Volume: 16
    • Issue Number: 3
    • Publisher: British Society for Strain Measurements
    • ISSN: 0039-2103

Subject/Index Terms

Filing Info

  • Accession Number: 00324983
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM