AN EXTENSOMETER FOR CIRCUMFERENTIAL STRAINS

An instrument is described for measuring circumferential strains in plactic specimens of circular cross section. It consists of four direct-current differential transformers (DCDTs) suitably mounted on an invar ring. The DCDTs probe the position of the surface of the specimen at opposite ends of two mutually perpendicular diameters. Examples of performance are given for creep of a thin-walled tube of polyurethane. /Author/

• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Findley, W N
  • Reed, R M
• Publication Date: 1975-7

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 300-302
• Serial:
  • ASTM Journal of Testing and Evaluation
  • Volume: 3
  • Issue Number: 4
  • Publisher: Federal Highway Administration

Subject/Index Terms

• TRT Terms: Creep; Extensometers; Measuring instruments; Performance; Plastics; Polyurethane resins; Ring stress; Strain (Mechanics); Stresses
• Old TRIS Terms: Circumferential stressing; Strains
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00126143
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 18 1975 12:00AM