Hertzian cone crack propagation on polycrystalline materials: Role of R-curve and residual stresses

Ceseracciu, Luca; Anglada, M.; Jiménez‐Piqué, E.

doi:10.1016/j.actamat.2007.09.030

Cited by 16 publications

(28 citation statements)

References 19 publications

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“…Evidently, monolithic ZrB 2 -SiC ceramic almost does not have R-curve behavior. According to the reported work, such none or very soft R-curve behavior implies that there is almost the absence of extrinsic toughening mechanisms that are operating in the wake of a propagating crack [26][27][28][29]. The slope of 0.425 in Fig.…”

Section: Resultsmentioning

confidence: 79%

“…The surface damage produced at different indentation loads demonstrates the differences in flexural strength losses for the laminated and monolithic ZrB 2 -SiC ceramics. As developed previously, the damage tolerance represented the resistance to damage of materials, especially the ability of resistance to strength degradation under external loads [26]. For a given indentation flaw, ceramic with compressive stresses at the surface always provides higher value of retained strength, which means that such ceramic presents higher damage tolerance.…”

Section: Resultsmentioning

confidence: 99%

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R-curve behavior of laminated ZrB2–SiC ceramic with strong interfaces

Zhou

Zhang

et al. 2015

International Journal of Refractory Metals and Hard Materials

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The damage resistance and R-curve behavior of laminated ZrB 2 -SiC ceramic fabricated by hot-pressing were investigated using indentation-strength technique. The difference in fracture resistance properties between the monolithic and laminated ZrB 2 -SiC ceramics was also analyzed and results showed that obvious R-curve behavior was found in laminated ZrB 2 -SiC ceramic, compared with monolithic ZrB 2 -SiC ceramics. Moreover, the indentation strength values of laminated ZrB 2 -SiC ceramic were observed to be insensitive to the increases in the indentation load, which indicated that laminated ZrB 2 -SiC ceramic has excellent damage resistance. The improvement in damage tolerance and R-curve behavior of laminated ZrB 2 -SiC ceramic was attributed to the macroscopic crack deflection due to the presence of residual compressive stresses.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

R-curve behavior of laminated ZrB2–SiC ceramic with strong interfaces

Zhou

Zhang

et al. 2015

International Journal of Refractory Metals and Hard Materials

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“…It is generally recognized that the ring cracks are caused by tensile stress [29]. The maximum tensile stress ı m in the specimen occurs at the contact circle (r=a, z=0):…”

Section: Experiments Principle Overviewmentioning

confidence: 99%

Strength degradation and lifetime prediction of dental zirconia ceramics under cyclic normal loading

et al. 2015

BME

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Abstract. Clinical cases show that zirconia restoration could happen fracture by accident under overloading after using a period of time. The purpose of this study is to research mechanical behavior and predict lifetime of dental zirconia ceramics under cyclic normal contact loading with experiments. Cyclic normal contact loading test and three point bending test are carried on specimens made of two brands of dental zirconia ceramic to obtain flexure strength and damage degree after different number of loading cycles. By means of damage mechanics model, damage degree under different number of contact loading cycles are calculated according to flexure strength, and verified by SEM photographs of cross section morphology of zirconia ceramics specimen phenomenologically. Relation curve of damage degree and number of cycles is fitted by polynomial fitting, then the number of loading cycles can be concluded when the specimen is complete damage. Strength degradation of two brands dental zirconia ceramics are researched in vitro, and prediction method of contact fatigue lifetime is established.

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“…13,18 In terms of fracture mechanics, it has also been shown that the cone crack angle and length may be severely modified in these materials compared to monolithic ceramics, both by the R-curve behaviour and the residual stresses. 19 It is thought that even in absence of such phenomena, the mere elastic mismatch between the first and second layer may have a remarkable influence on the crack formation.…”

Section: Introductionmentioning

confidence: 99%

“…19 A flat-punch indentation was applied to coatings of thickness approximately half the indenter radius, and with an either stiffer or more compliant substrate. The critical load for ring crack formation, its initial radius and growth stability, and the cone crack propagation inside the coating are affected by the stress modification.…”

Section: Introductionmentioning

confidence: 99%