Journal ArticleDOI
Modelling of Subcritical Crack Growth in Zirconia
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TLDR
In this paper, the authors modeled the subcritical crack growth phenomenon in zirconia by deflection mechanism and found that the applied stress intensity factors in the sub critical crack growth range get affected due to scattering in KI-Vdata, biassing of N values to higher magnitude and calculating erroneous life times.Abstract:
Subcritical crack growth phenomenon in zirconia is modelled in this paper The model simulates subcritical crack growth by deflection mechanism Due to phase transformation in zirconia, KI, the applied stress intensity factors in the subcritical crack growth range get affected This is the main reason for the following observations: (i) scattering in KI—Vdata, (ii) biassing of N values to higher magnitude and (iii) calculating erroneous life times All the above mentioned experimental observations are explained by the present modelread more
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Journal ArticleDOI
Science of zirconia-related engineering ceramics
TL;DR: In this paper, the physical principles behind the improvement of mechanical properties of zirconia (ZrO2) related ceramics are comprehensively reviewed, and three toughening mechanisms (phase transformation, micro-crack and crack deflection) are discussed.
Book ChapterDOI
Modelling of Subcritical Crack Growth in WC–Co Hard Metals
N. Eswara Prasad,S. B. Bhaduri +1 more
TL;DR: In this article, the subcritical crack growth data obtained by load relaxation tests on WC-Co system are modelled by means of tilting mechanism of crack deflection, which successfully predicts the shift in KI-V data with Co content and also explains other effects of varying Co content on the sub critical crack growth behavior of WC - Co system.
References
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Journal ArticleDOI
Crack deflection processes—I. Theory
TL;DR: In this article, a fracture mechanics approach has been used to predict fracture toughness increases due to crack deflection around second phase particles, based on a determination of the initial tilt and the maximum twist of the crack front between particles.
Book ChapterDOI
Subcritical Crack Growth in Ceramics
TL;DR: In this paper, a design technique is presented to predict useful component lifetime from crack growth data after proof testing, based on fracture mechanics concepts, and the available crack growth is discussed with particular emphasis on fracture mechanisms.
Journal ArticleDOI
Crack deflection: Implications for the growth of long and short fatigue cracks
TL;DR: In this paper, a simple elastic deflection model is developed to estimate the growth rates of nonlinear fatigue cracks subjected to various degrees of deflection, by incorporating changes in the effective driving force and in the apparent propagation rates.
Journal ArticleDOI
Sub-eutectoid aged Mg-PSZ alloy with enhanced thermal up-shock resistance
R. H. J. Hannink,R. C. Garvie +1 more
TL;DR: In this paper, it is proposed that the precipitate/matrix interface which governs the crystal structure of a precipitate at room temperature was altered by a type of solid state reaction, not previously reported, which occurs during ageing at 1100‡ C.
Journal ArticleDOI
Slow crack growth behavior in transformation-toughened Al2O3-ZrO2(Y2O3) ceramics
TL;DR: In this article, the authors show that increasing the contribution of the ZrO/sub 2/ phase transformation by tailoring the stabilizer content not only increases the critical fracture toughness (K/sub IC/) but also the K/sub Ia/ to initiate slow crack growth.