Fatigue of Yttria‐Stabilized Zirconia: I, Fatigue Damage, Fracture Origins, and Lifetime Prediction

Liu, Shih-Yu; Chen, I‐Wei

doi:10.1111/j.1151-2916.1991.tb04088.x

Cited by 128 publications

(59 citation statements)

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“…(4) yields the n T values given in Table 2, with m values from our experimental data and references. [32][33][34][35][36] Good agreement is seen between n T and m in Y-TZP and Mg-PSZ, suggesting the possibility that the ISIJ International, Vol. 43 (2003) monotonic decrease in tensile strength with decreasing strain rate observed in region A might be brought about by subcritical (static) growth of the microcrack nucleated during loading, as well as the other results previously reported in compression testing.…”

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Strain Rate Dependence of Tensile Behavior and Environmental Effect in Zirconia Ceramics

2003

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The tensile strength of four kinds of zirconia ceramics (two kinds of Y-TZP with different grain sizes, Mg-PSZ and Ce-TZP) has been investigated for a wide range of strain rates (3ϫ10 Ϫ9 -1.0ϫ10 Ϫ1 s Ϫ1) in both air and vacuum. The obviously unique strain rate dependence was observed in Y-TZPs and Mg-PSZ, which have anelastic properties. On the other hand, such strain rate dependence was not observed over the whole range of strain rates for Ce-TZP, which does not exhibit anelasticity. For all of the samples investigated, there was no significant difference between both values of tensile fracture strength in air and vacuum. It was found that a decrease in strength with decreasing strain rate should not be associated with the static fatigue growth of microcracks nucleated during loading. It was concluded that the extent of the occurrence and the exhaustion of anelasticity predominantly controls the tensile strength of zirconia ceramics.KEY WORDS: anelasticity; ADOV; ceramics; fatigue; fracture and fracture toughness. materials are degraded in hydrogen environment. 11,12) However, the extent of the strength degradation or static fatigue in hydrogen is lower than that in air, as reported in alumina and zirconia ceramics.11,12) Therefore, it is much more important to examine the mechanical behavior in air from the view point of clarifying the environmental effect in the ceramic materials loaded. There are quite a few reports that discuss the strain rate effect in zirconia ceramics. 4,6,7) Moreover, these studies have been carried out under compression testing, with the discussion focusing on tensile crack growth. [2][3][4][5][6][7] In this study, we conducted dynamic tensile testing over a wide range of strain rates for four kinds of zirconia ceramics, which have different mechanical properties, transformability, anelastic properties 9,10,13-18) and so on. Dynamic fracture testing was also carried out in vacuum in order to verify the true effect of subcritical microcrack growth on the strain rate dependence of tensile fracture strength. Possible Mechanism of Anelasticity in Zirconia CeramicsIn our recent work, 17,18) we have investigated anelastic behavior in some kinds of zirconia ceramics. Figure 2 shows the anelastic behavior in four kinds of materials (Y-TZP, Y-FSZ, Mg-PSZ and Ce-TZP) at 100 MPa and loadholding time of 10 h.18) This figure indicates that anelastic strain is produced in the Y 2 O 3 -ZrO 2 and MgO-ZrO 2 systems, but almost not in the CeO 2 -ZrO 2 system, irrespectively of the kind of crystallographic phase. This anelastic phenomenon appears even at extremely low stress level (Ͻ100 MPa) and produces time-dependent and recoverable strain.9,10) Therefore, such a unique behavior cannot be explained by conventional mechanism, for example, stress-induced phase transformation, [19][20][21] ferroelastic domain switching, [22][23][24][25] microcracking [26][27][28] and so on. It is well known that the large amount of oxygen vacancy is introduced in matrix of the Y 2 O 3 -ZrO 2 and MgO-ZrO 2 systems in order...

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Strain Rate Dependence of Tensile Behavior and Environmental Effect in Zirconia Ceramics

2003

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“…In ad dition, S/N curves appear to be much more sensitive to the load ratio than with metallic materials. 10) S/N curves on unnotched cantilever-beam samples of mid-toughness (MS grade) and overaged (pre transformed)…”

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Cyclic Fatigue of Ceramics

Ritchie

Dauskardt

1991

J. Ceram. Soc. Japan

123

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“…Esse sistema cerâmico apresenta valores médios de resistência à flexão variando entre 700 e 1500 MPa e tenacidade à fratura entre 4,4 e 9,4 MPa.m 1/2 (Liu;Chen, 1991;Kosmac et al, 1999;Tinschert et al, 2000;Luthardt et al, 2002;Guazzato et al, 2004a;Tinschert et al, 2007;Yilmaz et al, 2007;Oilo et al, 2008;Taskonak et al, 2008a). Foram reportados, para a YZ, valores de dureza ao redor de 12 GPa e módulo de elasticidade entre 220 e 240…”

Section: Zircônia Tetragonal Parcialmente Estabilizada Com óXido De íunclassified

“…Tinschert et al (2000) relataram um valor alto de módulo de Weibull para a YZ (18,4). Entretanto, outros estudos encontraram valores mais baixos de módulo de Weibull, variando entre 10 e 16 (Liu;Chen, 1991;Kosmac et al, 1999;Luthardt et al, 2002;Teixeira et al, 2007;Yilmaz et al, 2007).…”

Section: Zircônia Tetragonal Parcialmente Estabilizada Com óXido De íunclassified

“…Por outro lado, os parâmetros obtidos podem ser muito úteis na comparação entre diferentes materiais. Liu;Chen, 1991;Luthardt et al, 2002;Guazzato et al, 2004a;Tinschert et al, 2007;Yilmaz et al, 2007 (Guazzato et al, 2002;Guazzato et al, 2004a;Tinschert et al, 2007;Yilmaz et al, 2007;Taskonak et al, 2008b . Além disso, a presença de SCG também pode influenciar os resultados (Rosentiel;Porter, 1989).…”

Section: Comportamento De Crescimento Subcrítico De Trincas -Scgunclassified

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Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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Fatigue of Yttria‐Stabilized Zirconia: I, Fatigue Damage, Fracture Origins, and Lifetime Prediction

Cited by 128 publications

References 29 publications

Strain Rate Dependence of Tensile Behavior and Environmental Effect in Zirconia Ceramics

Strain Rate Dependence of Tensile Behavior and Environmental Effect in Zirconia Ceramics

Cyclic Fatigue of Ceramics

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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