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Measurement of interface fracture toughness requires knowledge of the appropriate K-calibration functions for the pertinent test geometries and material combinations. The four-point-bending geometry has been used in this study to calibrate the stress intensity factors in order to measure fracture toughness of a metal/nitride ceramic, Si(3)N(4)/Fe/Si(3)N(4), and a metal/oxide ceramic, Al(2)O(3)/Au/Al(2)O(3), joints over the full range of mode mixity. This calibration was done via finite element analysis. Specific techniques were adopted to decouple the two modes of fracture at the interface crack tip. The K-calibration functions for the pertinent geometry are strongly dependent on the metal interlayer thickness especially for loading conditions close to the mode I. Experimental results are presented for the Si(3)N(4)/Fe/Si(3)N(4) system.

Additional information

Authors: STAMOS V, JRC Petten (NL);PETEVES S D, JRC Petten (NL);KOSTOPOULOS V, University of Patras, Department of Mechanical and Aeronautical Engineering (GR)
Bibliographic Reference: Article: Engineering Fracture Mechanics (1998)
Record Number: 199811190 / Last updated on: 1998-10-09
Original language: en
Available languages: en
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