Results 211 to 220 of about 29,494 (264)

The fracture toughness of dental composites

Journal of Oral Rehabilitation, 1982
SummaryThe development of the stress intensification factor (KIC) and the fracture strength (σF) have been determined for a range of composite products. Changes in KIC resulting from storage are equated to the progression of polymerization and the loss or gain of plasticizer.
C H, Lloyd, R V, Iannetta
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Fracture Toughness of Human Dentin

Journal of Dental Research, 1986
Plane strain fracture toughness (K IC ) was determined for coronal dentin using compact tension test-pieces obtained from recently extracted permanent lower molar teeth. Specimens were prepared and tested such that the moving crack front was aligned parallel to the tubule orientation.
El Mowafy, O. M., Watts, D. C.
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Fracture toughness of compact bone

Journal of Biomechanics, 1976
The tensile fracture stress (σfr) of longitudinal bovine tibia compact bone specimens was measured as a function of the length (c) and radius of curvature (r) of machined edge cracks. It was established that, for a given value of r, then σFr = Ac −12 − B where A and B are constants.
W, Bonfield, P K, Datta
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Fracture toughness of thin and tough plates

International Journal of Fracture, 1978
Abstract : Wells has proposed using crack tip opening displacement as a measure of the fracture toughness of cracked plates in general yielding. The concept is applicable to thin plates loaded to extensive plastic deformation. The method is used to determine the fracture toughnesses of HY-80 steel plates. (Author)
H. W. Liu, Albert S. Kuo
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Fracture toughness of frozen meat

Meat Science, 1987
The fracture toughness and dynamic mechanical moduli of frozen beef M. semitendinosus were investigated at various sub-zero temperatures using several different test geometries. Traditional fracture mechanics methods were considered inapplicable to frozen meat, since considerable plastic flow occurs in addition to elastic deformation and fracture ...
B J, Dobraszczy, A G, Atkins, G, Jeronimidis, P P, Purslow   +3 more
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Fracture toughness and hydraulic fracturing

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1989
Abstract A study of the influence of fracture toughness on the shape of a hydraulically induced fracture is presented. Three-dimensional numerical simulations of fracture propagation show that fracture toughness is not the main controlling parameter if one chooses fracture toughness values determined at ambient conditions.
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The fracture toughness of repaired composite

Journal of Oral Rehabilitation, 1986
SummaryThe fracture toughness (K′IC) at the interface formed between a composite substrate and more recently placed composite has been measured to determine the strength of the repair. The substrate material was 24 h old at the time of the repair and the fracture toughness of the repair was measured 24 h later. Five composite products were selected for
V B, Dhuru, C H, Lloyd
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On the fracture toughness of equine metacarpi

Journal of Biomechanics, 1979
Abstract This paper reports on the measurement of both tensile and fracture behavior of paired equine metacarpi. Tests were performed at strain rates of 10 −4 sec −1 . Three-point bending tests were carried out on notched specimens to attain the toughness values and the same specimens were used to obtain the elastic moduli.
A, Alto, M H, Pope
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Fracture Toughness of Human Enamel

Journal of Dental Research, 1981
A microindentation technique was employed to estimate the fracture toughness of human enamel. A pattern of increasing fracture toughness values existed from incisal to cervical in incisor enamel. Statistical analysis indicated that the molar enamel was more brittle than either the canine or incisor enamel. It was observed that the cracks emanating from
R, Hassan, A A, Caputo, R F, Bunshah
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Analysis of fracture toughness data

Lifetime Data Analysis, 1995
In studies of the fracture toughness of irradiated weld metal, specimens are subjected to an increasing load. The test on any one specimen might be terminated by choice or because the specimen ruptures. Prior to termination, ductile tearing might or might not have occurred. The situation is thus basically one of competing risks, with different types of
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