Fatigue analysis of brittle materials using indentation flaws

Lawn, Brian R.; Marshall, David B.; Anstis, G. R.; Dabbs, T. P.

doi:10.1007/bf00552969

Cited by 30 publications

(31 citation statements)

References 15 publications

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“…analyzed using the well-known procedure proposed for dynamic fatigue tests on indented bars. 50 Therefore, a value of 41.8 Ϯ 3.1 was calculated for n, in good agreement with the result obtained from data in Fig. 6.…”

Section: (4) Fatigue Parameters From Indentation Testssupporting

confidence: 89%

Influence of Composition on Fatigue Behavior and Threshold Stress Intensity Factor of Borosilicate Glasses

Bertoldi

2002

Journal of the American Ceramic Society

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Fatigue behavior of borosilicate glasses was studied using the analysis of subcritical propagation of Vickers indentation cracks. Glasses containing various amounts of glass‐network modifiers, mainly soda, were considered. Cone and median/radial crack systems were observed, depending on glass composition, indenter geometry, and test environment. Indentation tests were performed in water, holding the maximum load for durations ranging from 15 s to 6 d. The analysis of the crack length as a function of dwell time allowed evaluation of the subcritical growth parameters and fatigue limit at crack arrest. The influence of composition on fatigue parameters and fatigue limit was discussed in terms of fourfold‐coordinated boron atoms fraction compared with the content of glass‐network modifier ions.

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Section: (4) Fatigue Parameters From Indentation Testssupporting

confidence: 89%

Influence of Composition on Fatigue Behavior and Threshold Stress Intensity Factor of Borosilicate Glasses

Bertoldi

2002

Journal of the American Ceramic Society

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“…5, where σ f was plotted against lnσ based on the exponential formulation of Eq. (17). The strength decreases with decreasing stress rate, indicative of SCG susceptibility, yielding a reasonably good linearity in the relation σ f versus lnσ .…”

Section: Constant Stress-rate Testing Datamentioning

confidence: 70%

“…To minimize the number of parameters to be specified (such as, A, a, σ , S i , K Ic , t etc. ), it is convenient to use a normalized scheme, as used previously for the power-law velocity formulation: 17,18…”

Section: Exponential Scg Formulationmentioning

confidence: 99%

“…The SCG parameters n and χ in constant stress-rate loading can be obtained from the slope and intercept by a linear regression analysis of σ f versus lnσ , together with a value of inert strength (S i ) based on Eq. (17). With n thus calculated, n can be evaluated from Eq.…”

Section: Exponential Scg Formulationmentioning

confidence: 99%

“…The SCG parameters of all 17 ceramics at elevated temperatures, determined by the linear regression analysis based on Eq. (17), are also shown in Table 1 together with those evaluated for the power-law formulation. Figure 8 is the power-law counterpart of Fig.…”

Section: Constant Stress-rate Testing Datamentioning

confidence: 99%

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Exponential slow crack growth of glass and advanced ceramics—dynamic fatigue

Choi

Nemeth

Gyekenyesi

2005

Fatigue Fract Eng Mat Struct

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A B S T R A C TThe life prediction analysis based on an exponential crack-velocity formulation was made and examined using a variety of experimental data on glass and advanced structural ceramics in constant stress-rate ('dynamic fatigue') loading at ambient and elevated temperatures. The data fit to the relation of strength versus ln (stress rate) was very reasonable for most of the materials. The major limitation in the exponential crack-velocity formulation, however, was that the inert strength of a material must be known a priori to evaluate the important SCG parameter, n, a significant drawback as compared with the conventional power-law crack-velocity formulation. N O M E N C L A T U R EA = slow-crack-growth parameter defined in Eq. (1) and Eqs (4)-(8) a = crack size B = slow-crack-growth parameter defined in Eq. (3) C = crack size in the normalization scheme defined in Eq. (9) c = critical D = slow-crack-growth parameter defined in Eq. (3) e = exponential crack-velocity formulation f = fracture I = mode I i = inert or initial condition K = stress intensity factor n = slow-crack-growth parameter defined in Eq. (1) and Eqs (4)-(8) r 2 = square of correlation coefficient p = power-law formulation S = strength T = time in the normalization scheme in Eq. (9) t = time v = crack velocity Y = crack geometry factor β = intercept of curve in linear regression analysis in Eq. (12) σ = applied stresṡ σ = applied stress rate χ = slow-crack-growth parameter defined in Eq. (18) * = normalized = apparent (calculated)

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Subkritisches Risswachstum in Glas in Abhängigkeit der Umgebungsbedingungen

2021

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Im vorliegenden Artikel wird das subkritische Risswachstum in Kalk-Natron-Silikatglas in Abhängigkeit von Temperatur und Feuchtigkeit untersucht. Dabei werden Risswachstumsparameter innerhalb einer Klimakammer mittels Doppelring-Biegeversuchen ermittelt. Um gleichbleibende initiale Risslängen in allen Probekörpern zu erhalten, sind diese mittels Vickers-Eindringprüfung vorgeschädigt. In einem numerischen Modell wird abschließend der Einfluss der am Riss vorhandenen Feuchtigkeit auf die Versagensspannung von Glas abgebildet und der Einfluss der in der Literatur vorhandenen Risswachstumsparameter auf das Versagen von Glas kritisch diskutiert.Subcritical crack growth in glass depending on environmental conditions. Subcritical crack growth in soda-lime-silicateglass is investigated under different environmental conditions. Crack growth parameters as a function of these conditions are determined by coaxial ring-on-ring tests. For a constant initial crack size in all specimen, the Vickers indentation tests was utilized. The influence of the present humidity at the crack tip on the failure strength of glass was simulated numerically. Finally, the general influence of the crack growth parameters available in literature on the failure of glass is discussed.

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Fatigue analysis of brittle materials using indentation flaws

Cited by 30 publications

References 15 publications

Influence of Composition on Fatigue Behavior and Threshold Stress Intensity Factor of Borosilicate Glasses

Influence of Composition on Fatigue Behavior and Threshold Stress Intensity Factor of Borosilicate Glasses

Exponential slow crack growth of glass and advanced ceramics—dynamic fatigue

Subkritisches Risswachstum in Glas in Abhängigkeit der Umgebungsbedingungen

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