Journal ArticleDOI
The interaction of a crack front with a second-phase dispersion
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In this paper, it was shown that a crack front increases its length by changing its shape when it interacts with two or more inhomogeneities in a brittle material, and an expression for the fracture energy was obtained.Abstract:
Observations are presented showing that a crack front increases its length by changing its shape when it interacts with two or more inhomogeneities in a brittle material. These observations are presented for both cleavage and conchoidal types of fracture. Based on these observations and the concept that a crack front possesses a line energy, an expression for the fracture energy is obtained. This expression shows that the fracture energy should increase as the distance between the dispersed inhomogeneities is decreased. Using the Griffith fracture criterion, this result is discussed for the case of strengthening a brittle material.read more
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Slow Growth of Microcracks: Evidence for One Type of ZrO2 Toughening
TL;DR: In this article, an alumina containing 15 vol% monoclinic ZrO2 dispersed at the grain boundaries exhibited very high room-temperature fracture toughness (∼11 MPa·m1/2) on cooling from 1275°C when microcrack precursors nucleated at T
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Effect of Milling on the Mechanical Properties of Chopped SiC Fiber-Reinforced ZrB2
TL;DR: While the fracture toughness and hardness were statistically the same independently of the milling conditions, the flexural strength changed and the best milling Conditions for optimized mechanical properties were determined.
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A Novel Technique for Producing Fine Metal Fibers for Enhancing Mechanical Properties of Glass‐Matrix Composites
TL;DR: In this paper, a method of mechanically reducing arc-cast ingots of Nb-Cu in which the original microstructure contains ductile Nb precipitates was described.
Journal ArticleDOI
Toughening effects in Al2O3-ZrO2 system
TL;DR: In this paper, the effect of unstabilized ZrO 2 on the properties of alumina ceramics was investigated and the critical grain size for tetragonal phase was determined.
References
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Journal ArticleDOI
The Phenomena of Rupture and Flow in Solids
TL;DR: In this article, the authors investigated the effect of surface scratches on the mechanical strength of solids, and some general conclusions were reached which appear to have a direct bearing on the problem of rupture, from an engineering standpoint, and also on the larger question of the nature of intermolecular cohesion.
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LXXV. The moving griffith crack
TL;DR: In this article, a straight crack moving through an elastic medium is calculated and the stresses depend on the velocity and reduce to Inglis' solution when the velocity is zero, and the results may be applied to the spicular fracture of glass.
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Fracture Surface Energy of Glass
TL;DR: In this article, the double-cantilever cleavage technique was used to measure the fracture surface energy of six glasses and the results ranged from 3.5 to 5.3 J/m2 depending on the chemical composition of the glass and the temperature of the test.