Results 211 to 220 of about 80,595 (263)
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Computing in Science & Engineering, 1999
How materials fracture is one of the most fundamental problems in materials science and engineering. Typically, the stress fields near the crack tip are highly nonlinear, and stress-field decay far from the tip is very slow, making fracture a difficult problem.
Priya Vashishta, Aiichiro Nakano
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How materials fracture is one of the most fundamental problems in materials science and engineering. Typically, the stress fields near the crack tip are highly nonlinear, and stress-field decay far from the tip is very slow, making fracture a difficult problem.
Priya Vashishta, Aiichiro Nakano
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Dynamic Instabilities in Fracture
Physical Review Letters, 1996We find that moving cracks are strongly unstable against deflection in essentially all conventional cohesive-zone models of fracture dynamics. This instability is governed by detailed mechanisms of deformation and decohesion at crack tips; it cannot be detected by quasistatic far-field theories that consider only energy balance and neglect relevant ...
, Ching, , Langer, , Nakanishi
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Dynamics of Fracture in Drying Suspensions
Langmuir, 2006We investigate the dynamics of fracture in drying films of colloidal silica. Water loss quenches the nanoparticle dispersions to form a liquid-saturated elastic network of particles that relieves drying-induced strain by cracking. These cracks display intriguing intermittent motion originating from the deformation of arrested crack tips and aging of ...
E R, Dufresne +6 more
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ON THE DYNAMIC FRACTURE OF PIEZOELECTRIC MATERIALS
The Quarterly Journal of Mechanics and Applied Mathematics, 1995Based on the fundamental equations of elastic piezoelectric materials in the quasielectrostatic approximation, the authors study problems of crack propagation. General results are first obtained concerning the solution for mechanical and electric crack-tip fields.
Dascalu, C., Maugin, G. A.
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Dynamic Instability in Intergranular Fracture
Physical Review Letters, 2005A molecular-dynamics model for crack propagation under steady-state conditions is used to study dynamic instabilities along a grain boundary in aluminum that occur when the crack speed approaches 1/3 of the material's Rayleigh wave speed. Instead of crack branching, as is characteristic for a crack propagating in a homogeneous environment, the ...
V, Yamakov +3 more
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Energy Dissipation in Dynamic Fracture
Physical Review Letters, 1996Measurements in PMMA of both the energy flux into the tip of a moving crack and the total surface area created via the microbranching instability indicate that the instability is the main mechanism for energy dissipation by a moving crack in brittle, amorphous material. Beyond the instability onset, the rate of fracture surface creation is proportional
, Sharon, , Gross, , Fineberg
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Dynamic bone scanning in fractures
Injury, 1981In 20 cases routine static bone scans were no value in the detection of delayed fracture healing. Using the 7.5-15 min net uptake of technetium labelled phosphate, disturbed fracture healing was detected in a series, of 37 cases. Normally healing fractures had an increase of 3 per cent per month and delayed unions less than half that amount. Non-unions
R R, Jacobs +4 more
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1983
Abstract : A summary and a bibliography are presented of the investigations on dynamic effects on fracture in elastic and elastic-plastic materials which were carried out at Northwestern University under the sponsorship of the Air Force Office of Scientific Research during the period July 1, 1978 - September 30, 1983.
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Abstract : A summary and a bibliography are presented of the investigations on dynamic effects on fracture in elastic and elastic-plastic materials which were carried out at Northwestern University under the sponsorship of the Air Force Office of Scientific Research during the period July 1, 1978 - September 30, 1983.
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Dynamic Fracture: Elementary Dynamics and Microscopic Fracture
2001The practical phenomena treated are the start of the extension of a crack, or crack initiation, its propagation with its characteristics, which are the path, straight ahead or along-branching or kinking, the growth rate, and its arrest.
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Journal of Mechanical Engineering Science, 1971
It is shown that the dynamic fracture criterion for metals is equivalent to the failure criterion of a Voigt body containing a non-Newtonian dashpot. Integration of the differential equation leads to the concept of a critical incubation time for fracture.
B. Steverding, A. H. Werkheiser
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It is shown that the dynamic fracture criterion for metals is equivalent to the failure criterion of a Voigt body containing a non-Newtonian dashpot. Integration of the differential equation leads to the concept of a critical incubation time for fracture.
B. Steverding, A. H. Werkheiser
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