SYMPOSIA PAPER Published: 01 January 1984
STP32738S

A Chevron-Notched Specimen for Fracture Toughness Measurements of Ceramic-Metal Interfaces

Source

A new double cantilever beam specimen with a chevron notch (short bar) has been developed to measure the fracture toughness, (or resistance), GIc, of ceramicmetal interfaces. The analysis of the specimen is based on previously developed compliance calibrations for homogeneous materials. Toughness measurements on a zinc-silicate glass ceramic-molybdenum system demonstrated that the bond at this interface is as tough (13 J/m2) as the glass ceramic alone. Measurements on a lithium silicate glass ceramic-Hastelloy 276 metal system showed that the toughness of the interface depends on the degree of bonding ranging from 19 J/m2 for weak bonding to 54 J/m2 for strong bonding. This specimen is being suggested for use in the study of the effect of heat treatment and bonding chemistry on fracture of metal-ceramic interfaces.

Author Information

Mecholsky, JJ
Sandia National Laboratories, Albuquerque, N. Mex.
Barker, LM
Sandia National Laboratories, Albuquerque, N. Mex.
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Details
Developed by Committee: E08
Pages: 324–336
DOI: 10.1520/STP32738S
ISBN-EB: 978-0-8031-4917-5
ISBN-13: 978-0-8031-0401-3