Methods for Determining the Mode I and Mode II Fracture Toughness of Glass Using Thermal Stresses

[+] Author and Article Information
J. T. Gillanders

University of California, Berkeley, CA 94720

R. A. Riddle, R. D. Streit

Lawrence Livermore National Laboratory, Livermore, CA 94550

I. Finnie

Mechanical Engineering Department, University of California, Berkeley, CA

J. Eng. Mater. Technol 112(2), 151-156 (Apr 01, 1990) (6 pages) doi:10.1115/1.2903301 History: Received December 09, 1988; Revised April 15, 1989; Online April 29, 2008


The fracture toughness of soda-lime glass was measured by applying thermal stresses to center-cracked plates. Mode I cracking was achieved by chilling the crack faces. The stress intensity factor was obtained by combining temperature measurements with a finite element solution. The average value of KIC = 0.77 MN/m3/2 based on three tests agrees well with values in the literature for a water-free environment. Mode II cracking was achieved by applying a temperature gradient normal to the crack. A value KIIC = 1.6 MN/m3/2 was obtained in two tests using a finite element computation based on the temperature distribution computed from the specimen’s thermal boundary conditions.

Copyright © 1990 by The American Society of Mechanical Engineers
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