Fatigue of Brittle Materials

Ritchie, Robert O.

doi:10.1016/b0-08-043749-4/04025-8

Cited by 2 publications

(2 citation statements)

References 85 publications

(148 reference statements)

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“…From a mechanical point of view, important information can be found regarding basic cyclic damage mechanisms in [21], emphasizing intergranular cracking, or in [22] showing a major difference between monotonic overload and cyclically induced fracture through the presence of multiple debris in the latter case. And since the unique characteristics of those brittle materials are likely to involve local transitions from mode I to mode II crack propagation, one should mention here the work of Landes [23] who reports intergranular (pullout) fracture for mode I, complemented again by the presence of debris for mode II.…”

Section: Introductionmentioning

confidence: 99%

Fractographic characterization of fatigued zirconia dental implants tested in room air and saline solution

Shemtov‐Yona

Özcan

Rittel

2019

Engineering Failure Analysis

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The identification of the fractographic signature of monotonic and fatigue loads in ceramic materials is far from being straightforward, as embodied in a subtle blend of cleavage (trans.) and intergranular fracture. As of today, most fractographic analyses are carried out at low/middle magnifications. In this research, we have systematically examined commercial zirconia dental implants that were fractured in the laboratory under monotonic overload and random spectrum fatigue, thus generating a bank of well controlled fractured reference specimens. The tests were carried out in both room air and in 0.9% saline solution. Our results show that it is difficult to distinguish static fracture in room air from saline solution. By contrast, spectrum fatigue in either air or saline solution, results in observable differences from dominantly trans. to a mixed trans.-intergranular fracture at the origin of the crack (first 60 m, as an upper bound value). Further down the unstable propagation zone, an increased tendency for intergranular fracture is observed, which seems to be exacerbated by the saline solution when compared with room air. Overall, it is observed that static and fatigue fractures can be distinguished from one another. It is believed that this fractographic database will serve as a reference for future analyses of broken ceramic dental implants and identification of their fracture mechanism.

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Section: Introductionmentioning

confidence: 99%

Fractographic characterization of fatigued zirconia dental implants tested in room air and saline solution

Shemtov‐Yona

Özcan

Rittel

2019

Engineering Failure Analysis

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“…The use of ceramics for bio-structural applications has been partly motivated by the prospect that they may be insensitive to mechanical degradation associated with fatigue loading, a subject that has been widely investigated. As of today, the prevailing view is that ceramics can indeed experience fatigue failure [19][20][21][22], although the responsible micromechanisms are totally different than those observed in metals [23]. Crack growth rate was found to be sensitive to several parameters, such as the stress intensity range, frequency and load ratio [11,19].…”

Section: Introductionmentioning

confidence: 99%

Random spectrum fatigue of zirconia oral implants in air and saline solution

Shemtov‐Yona

Özcan

Godinger

et al. 2019

Engineering Failure Analysis

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Zirconia oral implants are increasingly considered as an alternative to metallic (titanium) ones, mostly for their aesthetic properties and their metal free composition that enables soft tissue integration. We report a systematic comparison of the fatigue performance of oral implants of identical geometry, made of partially stabilized zirconia (Y-TZP) and titanium as a reference group, using random spectrum fatigue testing in both air and saline solution. The spectrum data clearly points unequivocally to the operation of a fatigue (damage accumulation) failure mechanism in the zirconia implants. Saline solution reduces the quasi-static fracture strength. It also causes a marked degradation of their spectrum fatigue longevity, but it does not affect their spectrum fatigue fracture strength. Given that the quasi-static fracture strength of the tested implants is smaller in saline solution than in air, the results suggest that the maximum admissible design loads for spectrum loaded zirconia oral implants are of the order of 0.8 times their wet (saline) quasi-static fracture strength.

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Fatigue of Brittle Materials

Cited by 2 publications

References 85 publications

Fractographic characterization of fatigued zirconia dental implants tested in room air and saline solution

Fractographic characterization of fatigued zirconia dental implants tested in room air and saline solution

Random spectrum fatigue of zirconia oral implants in air and saline solution

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