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Adsorption and Kinetic Effects on Crack Growth in MnZn Ferrites

Published online by Cambridge University Press:  31 January 2011

M. A. H. Donners ,
L. J. M. G. Dortmans  and
G. de With
M. A. H. Donners
Affiliation:
Laboratory of Solid State and Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
L. J. M. G. Dortmans
Affiliation:
TNO Institute of Applied Physics, P.O. Box 595, 5600 AN, Eindhoven, The Netherlands
G. de With*
Affiliation:
Laboratory of Solid State and Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
*
b)Address all correspondence to this author.
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Abstract

The variation of the fracture toughness of MnZn ferrite ceramics with varying loading rate and humidity was determined with the aid of the single edge notched beam (SENB) test. A strong decrease with increasing humidity and decreasing loading rate was observed. A model for subcritical crack growth incorporating kinetic and adsorption effects was formulated to analyze the data. The value of the adsorptioncontrolled fracture toughness was determined independently by double torsion experiments and agreed favorably with the values as determined from the SENB data using the model. The strength of the material was determined, and analysis showed a strength behavior similar to the fracture toughness behavior, as predicted by the model. The analysis presented can be used to assess the subcritical crack growth behavior using a limited number of SENB specimens.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 6 , June 2000 , pp. 1377 - 1388
Copyright
Copyright © Materials Research Society 2000

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References

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