Results 251 to 260 of about 2,714,278 (296)
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Resistance to fracture of endodontically treated roots
Oral Surgery, Oral Medicine, Oral Pathology, 1992The root canals of 48 single-canal canine teeth were prepared by four different methods. The coronal lingual wall and root canal space were lowered to 2 mm below the buccal wall of the roots. The prepared root was placed into acrylic resin so that 12 mm of buccal root was exposed. A slowly increasing force was applied at the junction of the buccal wall
M, Trope, H L, Ray
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Improving the Fracture Resistance of Dental Ceramic
Journal of Dental Research, 1977A time-temperature sequence for optimally strengthening dental ceramic by ion exchange was investigated. Stress relaxation occurs at higher temperatures and/or longer times. Improved strengths are obtained in a reasonable period of time that could be used for clinical application.
B, Dunn, M N, Levy, M H, Reisbick
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Brittle Fracture Resistance Characteristics of Weather-Resistant 14KhGNDTs Steel
Russian Metallurgy (Metally), 2020The effect of carbon, zirconium, and vanadium content on the characteristics of brittle fracture resistance of weather-resistant 14XGNDC steel is investigated. The correlation of the propagation of a viscous crack with the volume fraction of perlite is considered.
V.M. Goritskii, G.R. Shneiderov
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Metal Science and Heat Treatment, 1992
1. The brittle fracture mechanism was considered taking into consideration the results of earlier conducted works [29, 35, 46]. 2. To determine the brittle strength of iron alloys the equation $$\sigma _{br} \cong 20 000\sqrt {\frac{r}{l},} $$ where r is the radius at the crack tip (most probable 0.01 ...
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1. The brittle fracture mechanism was considered taking into consideration the results of earlier conducted works [29, 35, 46]. 2. To determine the brittle strength of iron alloys the equation $$\sigma _{br} \cong 20 000\sqrt {\frac{r}{l},} $$ where r is the radius at the crack tip (most probable 0.01 ...
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Evaluation of fracture resistance of ceramics: Edge fracture tests
Ceramics International, 2007Advanced oxide and nonoxide ceramics were tested by edge flaking with different indenters. Flaking toughness values obtained with the Rockwell indenter were shown to be practically proportional to fracture toughness values measured by the single edge V-notched beam (SEVNB) method.
George Gogotsi +2 more
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2003
Abstract This article briefly describes the historical development of fracture resistance testing of polymers and reviews several test methods developed for determining the fracture toughness of polymeric materials. The discussion covers J-integral testing, the methods for determining linear elastic fracture toughness, testing of thin ...
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Abstract This article briefly describes the historical development of fracture resistance testing of polymers and reviews several test methods developed for determining the fracture toughness of polymeric materials. The discussion covers J-integral testing, the methods for determining linear elastic fracture toughness, testing of thin ...
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Fracture resistance of notched specimens
Engineering Fracture Mechanics, 1981Abstract This paper gives a theoretical approach to the general problem of the static fracture resistance in the presence of stress concentrations. First of all, an approaching calculation model is proposed for elastic and plastic stress in the reduced section of a circumferentially notched cylindrical bar.
G. Valentin, G. Gasc
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Fracture resistance of materials
1982This section will be concerned with the case of an existing crack; the conditions that led to the initiation of this crack are not of interest for the discussion. For a perfectly brittle extension of this crack by cleavage, the criterion for crack propagation seems fairly easy.
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The Journal of the American Dental Association, 1982
W B, Eames, R L, Lambert
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W B, Eames, R L, Lambert
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Fracture Resistance of Nanocrystalline Ni
Metallurgical and Materials Transactions A, 2007Atomic level simulations are used to study crack propagation mechanisms in nanocrystalline Ni. Digital samples with a mean grain size of 5 and 8 nm containing 125 grains were used. For both grain sizes, the mechanism of crack propagation involves the formation of nanocracks along grain boundaries in the vicinity of the main crack.
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