Lifetime prediction of ceramics: Importance of the test method

Sudreau, F.; Olagnon, C.; Fantozzi, Gilbert

doi:10.1016/0272-8842(94)90069-8

Cited by 23 publications

(28 citation statements)

References 25 publications

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“…However, similar trends have been reported in constant stressrate flexure tests conducted on other materials tested in different RHs. Sudreau et al 23 tested mullite samples that were indented, and then annealed, at loading rates ranging from 0.04 to 30 MPa/s in air and water. They reported n 5 19 in air and n 5 36 in water, i.e., a higher n in a higher humidity environment.…”

Section: Discussionmentioning

confidence: 99%

Sub‐Critical Crack Growth Behavior of a Low‐Temperature Co‐Fired Ceramic

Tandon

Newton

Monroe

et al. 2007

Journal of the American Ceramic Society

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The strength of sintered low‐temperature co‐fired ceramic (LTCC) disks was measured under dry (<2% relative humidity [RH]) and wet (98% RH) conditions, using ring‐on‐ring, biaxial‐flexure testing in the stressing rate range of 0.002–2 MPa/s. The empirical sub‐critical crack growth parameters, n and A, were calculated. The values of the parameters in the wet environment were higher than in the dry environment. It is argued that the high RH n value is more representative of material behavior. Results of fractographic examination are reported and expected lifetime and safe design stresses for LTCC are calculated.

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Section: Discussionmentioning

confidence: 99%

Sub‐Critical Crack Growth Behavior of a Low‐Temperature Co‐Fired Ceramic

Tandon

Newton

Monroe

et al. 2007

Journal of the American Ceramic Society

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“…[13][14][15][16][17] In the constant stress-rate test the strength is determined at different stress rates and in the constant stress test the time to fracture is measured at different applied constant stresses. But this last approach is not as common as the constant stress-rate test, since it usually involves longer testing times.…”

Section: Introductionmentioning

confidence: 99%

Determination of the slow crack growth susceptibility coefficient of dental ceramics using different methods

et al. 2011

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This study compared three methods for the determination of the slow crack growth susceptibility coefficient (n) of two veneering ceramics (VM7 and d.Sign), two glass-ceramics (Empress and Empress 2) and a glass-infiltrated alumina composite (In-Ceram Alumina). Discs (n = 10) were prepared according to manufacturers' recommendations and polished. The constant stress-rate test was performed at five constant stress rates to calculate n(d) . For the indentation fracture test to determine n(IF) , Vickers indentations were performed and the crack lengths were measured under an optical microscope. For the constant stress test (performed only for d.Sign for the determination of n(s) ) four constant stresses were applied and held constant until the specimens' fracture and the time to failure was recorded. All tests were performed in artificial saliva at 37°C. The n(d) values were 17.2 for Empress 2, followed by d.Sign (20.5), VM7 (26.5), Empress (30.2), and In-Ceram Alumina (31.1). In-Ceram Alumina and Empress 2 showed the highest n(IF) values, 66.0 and 40.2, respectively. The n(IF) values determined for Empress (25.2), d.Sign (25.6), and VM7 (20.1) were similar. The n(s) value determined for d.Sign was 31.4. It can be concluded that the n values determined for the dental ceramics evaluated were significantly influenced by the test method used.

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“…A machinable alumina/glass composite was compared to a machinable, feldspathic porcelain. S trength–fracture P robability–life T ime diagrams (SPT) were derived from the crack growth behavior, which allowed the lifetime of a ceramic restoration under certain loading conditions to be assessed 16…”

Section: Introductionmentioning

confidence: 99%

Lifetime prediction of CAD/CAM dental ceramics

Lohbauer

Petschelt

Greil

2002

J. Biomed. Mater. Res.

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The dynamic fatigue method was used to obtain subcritical crack growth parameters n and A for a commercial feldspathic dental porcelain and for a lanthanum-glass-infiltrated alumina glass ceramic. Five stress rates d sigma/dt ranging from 50 to 0.01 MPa s(-1) were applied. The inert strength values were calculated with the use of Weibull statistics and maximum-likelihood approaches for the Weibull parameter m. Strength-probability-time (SPT) diagrams were derived for both materials. The alumina glass composite showed a high fracture strength sigma(0) (442 MPa) at a failure probability of P(F) = 63.2% and a high resistance against subcritical crack growth (n = 36.5). The development of strength under fatigue conditions was calculated for exemplary 1 year. The strength of the alumina glass material dropped to 228 MPa within this period. This fact is due to a low content of infiltrated lanthanum glass phase in the composite material (25 wt%). In contrast, for the high-silica-glass-containing porcelain a distinct decrease of strength sigma(0) from initial 133 to 47 MPa after 1 year was predicted. This, mainly because of a low crack growth resistance (n = 16.8) of the feldspathic porcelain. Much lower strength values were calculated, assuming a failure probability of P(F) = 5%. The decrease is mainly caused by the sensitivity of high-glass-containing ceramics against water corrosion.

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Lifetime prediction of ceramics: Importance of the test method

Cited by 23 publications

References 25 publications

Sub‐Critical Crack Growth Behavior of a Low‐Temperature Co‐Fired Ceramic

Sub‐Critical Crack Growth Behavior of a Low‐Temperature Co‐Fired Ceramic

Determination of the slow crack growth susceptibility coefficient of dental ceramics using different methods

Lifetime prediction of CAD/CAM dental ceramics

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