Study of the residual stress field around Vickers indentations in a 3Y-TZP
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Indentation cracks are often used as initial flaws in ceramics for different mechanical tests because of their unique advantages. The residual stresses around the indent due to the elastic/plastic contact must generally be relaxed, which can be conducted by heat treatment. The stress field around Vickers indentation and conditions of annealing have been analysed on a Y-TZP material. Different heat treatments from room temperature up to 1200 °C have been conducted. The residual stress field has been characterized by different methods. First, stable crack propagation in the residual stress field has been conducted by applying a bending stress to the indented specimens. The apparent toughness has also been measured by conducting fast fracture on indented specimens. Finally the residual stress present around the indentation has been measured by making micro-indentations and by measuring the crack lengths. The results show that at intermediate temperatures up to 600 °C an apparent stress relaxation occurs due to the tetragonal to monoclinic phase transformation which induced a superimposed compressive stress. The higher temperature of 1200 °C effectively leads to a real stress relaxation without healing the crack.
KeywordsHeat Treatment Residual Stress Compressive Stress Crack Length Stress Relaxation
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- 4.A. PAJARES, F. GUIBERTEAU, A. DOMINGUEZ-RODRIGUEZ, G. DRANSMANN, R. W. STEINBRECH, in Proceedings of the Second Euro Ceramics, Vol. 2, Aylesburg 1991, edited by G. Ziegler and H. Hausner, pp. 1023–1030.Google Scholar
- 5.A. PAJARES, F. GUIBERTEAU, A. DOMINGUEZ-RODRIGUEZ, G. DRANSMANN, Y. STOCKMAN and R. W. STEINBRECH, in Proceedings of the Third Euro Ceramics, Vol. 3, 1993, edited by P. Durand and J. F. Fernandez, pp. 531–536.Google Scholar
- 6.R. KURTH, G. KLEIST and R. W. STEINBRECH, in Proceedings of the Third Euro Ceramics, Vol. 3, 1993, edited by P. Durand and J. F. Fernandez, pp. 853–858.Google Scholar
- 12.F. W. SMITH, A. F. EMERY and A. S. KOBAYASHI,J. Appl. Mech. ASME, December (1967) N ° 67-WA/APM-2.Google Scholar
- 14.J. CHEVALIER, C. OLAGNON and G. FANTOZZI, in Proceedings of the 3rd European Ceramic Society Conference, Madrid(SP), September 1993, Vol. 3, pp. 871–76.Google Scholar
- 15.M. KNECHTEL, D. GARCIA, J. RÖDEL and N. CLAUSSEN,ibid. 76 (1993) 2681.Google Scholar
- 16.G. BEHRENS, G. W. DRANSMANN and A. HEUER,ibid. 76 (1993) 1025.Google Scholar