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|Title:||Metal Thickness Effect on the Calibration of Stress Intensity Factors for Si3N4 / Fe & Al2O3/Au Joints.|
|Authors:||STAMOS Vassilis; PETEVES Stathis dimitris; KOSTOPOULOS Vassilis|
|Citation:||Engineering Fracture Mechanics vol. 60 no. 3 p. 323-332|
|Type:||Articles in periodicals and books|
|Abstract:||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, Si3N4/Fe/Si3N4, and a metal/oxide ceramic, Al2O3/Au/Al2O3, joints over the full range of mode mixity. This calibration was done via finite element analysis. Specific techniques were adopted to decouple the two models 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 Si3N4/Fe/Si3N4 systems. Keywords: metal/ceramic interface, fracture toughness calibration, mode mixity, asymetric 4-point bending, FEM.|
|JRC Directorate:||Joint Research Centre Historical Collection|
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