Results 221 to 230 of about 29,262 (266)

Crack propagation at supersonic velocities, I

International Journal of Fracture Mechanics, 1969
A theoretical model for laser-induced supersonic cracks in crystals with weak cleavage planes is developed. The crack is pictured as being driven by a laser-induced expanding plasma. The theory predicts the crack length-time history to be expected for a given energy-time input curve. The conditions for laser-induced supersonic crack production are seen
D. A. Shockey, S. Winkler, D. R. Curran
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Micromechanisms of Crack Initiation and Crack Propagation

1985
After summarizing fracture mechanics parameters the paper introduces micromechanical models of cleavage fracture. It is shown that cleavage can be interpreted in terms of the local tensile stress required to propagate micro-cracks. Methods to determine the microscopic cleavage stress are presented.
W. Dahl, D. Dormagen
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A Diffraction Problem and Crack Propagation

Journal of Applied Mechanics, 1967
The exact solution to the problem of diffraction of plane harmonic polarized shear waves by a half-plane crack extending under antiplane strain is constructed. The solution is employed to study the nature of the stress field associated with an extending crack in an elastic medium excited by stress waves.
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Crack propagation in graphene

Journal of Applied Physics, 2015
The crack initiation and growth mechanisms in an 2D graphene lattice structure are studied based on molecular dynamics simulations. Crack growth in an initial edge crack model in the arm-chair and the zig-zag lattice configurations of graphene are considered. Influence of the time steps on the post yielding behaviour of graphene is studied.
P. R. Budarapu, B. Javvaji, V. K. Sutrakar, D. Roy Mahapatra, G. Zi, T. Rabczuk   +5 more
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Curved crack propagation

International Journal of Fracture, 1979
While currently used criteria for onset of crack propagation in a mixed mode loading situation give different predictions for the angle of incipient branching, the present paper demonstrates that the trajectory of a curved crack to a large extent is independent of the choice among these criteria.
Hans Bergkvist, Lan Guex
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Further Studies of Crack Propagation Using the Controlled Crack Propagation Approach

1974
In a previous paper, a new fracture-toughness-measuring technique was presented which made it possible to evaluate the functional relationship between load and cracklength at the moment of crack initiation or arrest. It was demonstrated that this relationship is directly relatable to the strain energy release rate and experimental results were ...
RH Weitzmann, I Finnie
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On the nonsteady propagation of cracks

Journal of Applied Mathematics and Mechanics, 1962
Abstract Investigations of the processes of crack propagation have continued now for a considerable period of time, and it would be fair to say that in the field of stationary propagation of cracks the investigations have more or less reached completion.
Barenblatt, G. I., Salganik, R. L., Cherepanov, G. P.   +2 more
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Theory of propagation of cracks

Journal of Engineering Mathematics, 1975
The criterion for the plastic flow of crystalline solids is well established but a similar criterion for the fracture of brittle solids under triaxial stress conditions has not been proposed so far. According to the present theory, brittle fracture occurs as the result of the formation and subsequent propagation of microcracks.
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Crack Formation and Propagation

MRS Bulletin, 1989
After Griffith's explanation of the decrease in the strength of a loaded material containing a disbonded area (a crack), it took about another quarter century before “Fracture Mechanics” as an engineering discipline became established. At that time it was the catastrophic failure of the Liberty ships and the basic contributions by Irwin2 that created a
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Simulation of Crack Propagation

2014
We shall consider the simulation-based fracture control design. It is well known that the simulation of the formation of brittle or fatigue cracks is essential for the precise evaluation of fracture modes and fracture processes, so that several numerical simulation systems could be developed based on the finite element method, meshless method, and/or ...
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