A Tensile-Load Relaxation Test for Measuring the Stress Enhanced Corrosion Exponent of Ceramics with Open Porosity


Article Preview

A tensile test is proposed for evaluating the stress enhanced corrosion-coefficient of ceramics with open porosity. The analysis of load at fixed grip conditions bases on the assumption that stress corrosion results in a spread of pre-existing generalised damage seen as micro-crack starter due to open porosity. Sub-critical crack extension of microcracks departs from pores and provokes a time dependant diminution of the Young’s modulus, and of the stiffness, of the tested sample. The description derives the number and the size of pre-existing micro-cracks with respect to time. The density of microcrack-nuclei results from the process and belongs to the microstructure, i.e., the number of channels or crack starters, and is considered to remain constant. The rate of diminution of the load is considered, either with respect to the initial one or to a deduced stress intensity factor. Simple relationships yield then an approximate diagram for stress enhanced corrosion. Samples resulting from sintering a mixture of alumina and titania powders were tested under tempered water flow. A stress corrosion exponent, n = 16, near to that of alumina was obtained.



Key Engineering Materials (Volumes 280-283)

Edited by:

Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li




F. Osterstock and O. Vansse, "A Tensile-Load Relaxation Test for Measuring the Stress Enhanced Corrosion Exponent of Ceramics with Open Porosity", Key Engineering Materials, Vols. 280-283, pp. 1751-1756, 2005

Online since:

February 2007




[1] S.M. Wiederhorn: Subcritical crack growth' in "Concise Encyclopaedia of Advanced Ceramic Materials, R.J. Brook editor, Pergamon Press, (1991).

DOI: https://doi.org/10.1016/b978-0-08-034720-2.50126-x

[2] R.A. McCauley: Corrosion of ceramics (Marcel Dekker Inc., 1995).

[3] R.F. Pabst, W. Tradinik and A. Bornhauser: Proc. Brit. Ceram. Soc. Vol. 32 (1982), p.149.

[4] W. Tradinik, K. Kromp and R.F. Pabst: Mat. Sci. Eng. (1982), pp.39-46.

[5] J. Weertman: Trans. Am. Soc. Met. Vol. 62 (1962), p.502.

[6] D.P.H. Hasselmann and A. Venkateswaran: J. Am. Ceram. Soc. Vol. 66 (1963), pp. C36.

[7] J.L. Chermant and F. Osterstock: Mat. Sci. Eng. (1985), 71, 147.

[8] F. Osterstock: Fracture Mechanics of Ceramics Vol. 6 (1983), p.243.

[9] F. Osterstock and J.L. Chermant, Science of Hard Materials, Plenum Press, (1983), p.614.

[10] F. Osterstock, I. St. Doltsinis and O. Vansse, The brazilian reliability test and micromechanical modelling for channelled cylinders of multiphased porous ceramics, This conference.

DOI: https://doi.org/10.4028/0-87849-959-8.1731

Fetching data from Crossref.
This may take some time to load.