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Title:Phenomenon of fracture and fracture morphology of glass tested in tension flexure and torsion
Author(s):Cameron, N.M.
Fracture Morphology
Abstract:A method of testing glass rods in tension and torsion was devised. Two types of glass, Pyrex and Soda-lime, were tested in tension, flexure and torsion and the data analyzed by both Normal and Weibull statistics. A significant difference in strength was found to exist between the tension and flexural techniques of testing of similar specimens of Soda-lime glass. This difference is explained by the size effect brought about by the pre-existing flaw concept. A significant difference was also found between similar specimens of Pyrex and Soda-lime when both were tested in tension. This is explained by a difference in intrinsic strengths of the two glasses. Explanations are put forward concerning the formation of certain fracture markings and light and electron micrographs are presented to indicate the various markings that may be observed on glass fracture surfaces. The fact that a Griffith type equation can be used to predict the nominal stress at fracture, with the mirror being considered as the flaw, is explained, using the concepts of Irwin, by suggesting that in any one glass there is a specific strain energy release rate, Gm, associated with the mirror boundary.
Issue Date:1963-04
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 242
Genre:Technical Report
Sponsor:U.S. Naval Research Laboratory, Contract No. Nonr 2947 (02) (x), NRL Project 62 R05 19A, Technical Memo No. 190
Rights Information:Copyright 1963 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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