Abstract
An analysis for the nucleation of microcracks from the inhomogeneous flow lines in soda-lime glass under Vickers indentations is considered. The minimum loads for crack nucleation are shown to depend on the hardness,H, and the critical stress intensity factor,K IC. Unlike the Lawn and Evans analysis, the present model does not require the presence of any fortuitous flaws of critical dimensions in the material, since the flaws are nucleated by the deformation in the deformed zone.
Similar content being viewed by others
References
J. T. Hagan andM. V. Swain,J. Phys. D. Appl. Phys. 11 (1978) 2091.
B. R. Lawn andA. G. Evans,J. Mater Sci. 12, (1977) 2195.
B. R. Lawn andE. R. Fuller,ibid. 10 (1975) 2016.
B. R. Lawn andM. V. Swain,ibid. 10 (1975) 113.
H. E. Exner,Trans. Met. Soc. AIME 245 (1969) 677.
A. G. Evans,J. Amer. Ceram. Soc. 59 (1976) 371.
A. G. Evans andT. R. Wilshaw,Acta Met. 24 (1976) 939.
R. Hill, “The Mathematical Theory of Plasticity”, (Clarendon Press, Oxford, 1950).
C. Zener,Trans. ASM 40 (1948) 2.
A. N. Stroh,Adv. Phys. 6 (1957) 192.
A. H. Cottrell,Trans. Met. Soc. AIME 212 (1958) 192.
J. A. William,Acta Met. 15 (1967) 1559.
A. S. Keh, J. C. M. Li andY. F. Chou,ibid 7 (1959) 694.
K. W. Peter,J. Non. Cryst. Solids 5 (1970) 103.
T. O. Mulhearn,J. Mech. Phys. Solids 7 (1959) 85.
J. T. Hagan, (1979) to be published.
M. V. Swain,Wear 48 (1978) 173.
J. T. Hagan,J. Mater. Sci. 14 (1979) 462.
J. D. B. Veldkamp, N. Hattu andV. A. C. Snijders, “Fracture Mechanisms of Ceramics”, Vol. 3, edited by R. C. Bradt, D. P. D. Hasselman and F. F. Lange (Plenum Press, New York, London, 1978).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hagan, J.T. Micromechanics of crack nucleation during indentations. J Mater Sci 14, 2975–2980 (1979). https://doi.org/10.1007/BF00611482
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00611482