An Extensometer for Circumferential Strains

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Volume 3, Issue 4 (July 1975)

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ISSN: 0090-3973
Page Count: 3

An Extensometer for Circumferential Strains
Findley, WN
Professor of engineering and technical assistant, Division of Engineering, Brown University, R.I.

Reed, RM

Abstract

An instrument is described for measuring circumferential strains in plastic 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.

Keywords:
extensometers, strains, plastics, creep, circumferential strain, differential transformers

Paper ID: JTE10659J
DOI: 10.1520/JTE10659J
ASTM International is a member of CrossRef.

Author Title An Extensometer for Circumferential Strains Symposium , 0000-00-00 Committee D20

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 3, Issue 4 (July 1975) Click here to download this paper now for $25 PDF (136K) View License Agreement ISSN: 0090-3973 Page Count: 3 An Extensometer for Circumferential Strains Findley, WN Professor of engineering and technical assistant, Division of Engineering, Brown University, R.I. Reed, RM Abstract An instrument is described for measuring circumferential strains in plastic 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. Keywords: extensometers, strains, plastics, creep, circumferential strain, differential transformers Paper ID: JTE10659J DOI: 10.1520/JTE10659J ASTM International is a member of CrossRef. Author Title An Extensometer for Circumferential Strains Symposium , 0000-00-00 Committee D20