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
Citations
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Fracture of a brittle particulate composite: Part 1 Experimental aspects
TL;DR: In this article, the fracture process in a model brittle composite containing nickel spheres in a glass matrix was studied using ultrasonic fractography, which traced changes in the crack front configuration and local crack velocity as the crack interacted with the array of nickel particles.
Journal ArticleDOI
Improvements and mechanisms of fracture and fatigue properties of well-dispersed alumina/epoxy nanocomposites
TL;DR: In this paper, Zhao et al. measured fracture toughness and fatigue crack propagation (FCP) rate of the materials used in the preceding paper were measured as a function of interface condition to gain further insight into the mechanisms leading to enhanced mechanical performance.
Journal ArticleDOI
Facile hydroxylation of halloysite nanotubes for epoxy nanocomposite applications
TL;DR: In this article, a facile approach to achieve a high level of dispersion of halloysite nanotubes (HNTs) in epoxy by treating HNTs with a low concentration of sodium hydroxide (NaOH) was reported.
Journal ArticleDOI
Ceramic-matrix composites
I. W. Donald,P. W. McMillan +1 more
TL;DR: In this paper, the effect of matrix microcracking on the mechanical and thermal stability of reinforced-ceramic composites is evaluated, and it is concluded that, although the potential applications of such materials are extremely diverse, several important aspects, particularly the effect that matrix micro-cracking may have on the structural stability, must be fully evaluated before ceramic-matrix composites can seriously be considered as useful replacements for more conventional materials.
Journal ArticleDOI
Effect of particle size on the fracture toughness of epoxy resin filled with spherical silica
TL;DR: In this paper, the effect of particle size on the fracture behavior of cured epoxy resins filled with spherical silica particles was studied and the critical stress intensity factor (Kc) and critical strain energy release rate (Gc) values increased with particle size.
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.