Results 201 to 210 of about 13,745 (237)
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Crack-Tip Strain Field in Supershear Crack of Elastomers
ACS Macro Letters, 2020We characterize the crack-tip strain field in the high-speed (supershear) crack in the elastomers propagating faster than the shear wave speed of sound (Cs). The dependence of steady-state crack velocity (V) on input tearing energy exhibits a crossover at V ≈ Cs between the subsonic (V < Cs) and supershear cracks (V > Cs). Several features of the crack-
Thanh-Tam Mai +3 more
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Fatigue Crack Tip Plasticity for Inclined Cracks
International Journal of Steel Structures, 2018The evaluation of the crack tip deformation is essential to the estimation of crack growth under either static or cyclic loading. A 3-D elastic–plastic finite element analysis was developed to simulate the crack tip deformation along mixed mode inclined edge cracks in a steel plate subjected to either monotonic or cyclic loading at selected R-ratios ...
Hesham El-Emam +3 more
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Crack tip closure and environmental crack propagation
Engineering Fracture Mechanics, 1975Abstract Crack propagation rate, da/dN, and crack tip closure stress, σcc, in part-through crack fatigue specimens of aluminum alloys are drastically affected by gaseous environments. The present studies indicate that the crack closure reflects the influence of the environment on the plastic deformation at the crack tip, and, therefore, on the crack ...
O. Buck, J.D. Frandsen, H.L. Marcus
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Engineering Fracture Mechanics, 1986
Abstract The processes in the vicinity of the crack tip are of fundamental importance to crack growth. Still, this region is generally very poorly characterized. A one-parameter description may imply serious limitations on the accuracy, even at a small scale of yielding. A second parameter might be needed.
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Abstract The processes in the vicinity of the crack tip are of fundamental importance to crack growth. Still, this region is generally very poorly characterized. A one-parameter description may imply serious limitations on the accuracy, even at a small scale of yielding. A second parameter might be needed.
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Philosophical Magazine, 1967
Abstract A case is presented to show that the radius of the tip of a propagating crack should not be calculated as indicated by Hull et al. (1965), and by Tetelman and Johnston (1965) without a prior derivation of the formulae they use. These formulae do not appear in the reference cited by these authors, and do not seem to be in keeping with the ideas
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Abstract A case is presented to show that the radius of the tip of a propagating crack should not be calculated as indicated by Hull et al. (1965), and by Tetelman and Johnston (1965) without a prior derivation of the formulae they use. These formulae do not appear in the reference cited by these authors, and do not seem to be in keeping with the ideas
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3D Crack‐tip Microscopy: Illuminating Micro‐Scale Effects on Crack‐Tip Behavior
Advanced Engineering Materials, 2011AbstractTraditionally the driving force for crack growth is described in terms of global parameters which, for continua, nevertheless reflect the local conditions at the crack‐tip. Mimicking nature, materials microstructures are now being designed at the microscale, or even the nanoscale, employing interfaces and heterogeneities to shield the ...
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Atomic-Scale Mechanism of Crack-Tip Plasticity: Dislocation Nucleation and Crack-Tip Shielding
Physical Review Letters, 1997By isolating the process of dislocation emission from a crack tip under an applied tensile stress, we extract from a molecular dynamics simulation the atomic-level displacement and stress fields on the activated slip plane before and after the nucleation event.
Fabrizio Cleri +3 more
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Philosophical Magazine A, 1995
Abstract Flutter of a crack tip occurs when the relatively flexible tip collides with density fluctuations in a solid. The crack velocity must exceed a critical value. The crack tip behaves like a self-excited oscillator. Its fundamental frequency can be estimated using Friedel's dislocation model of a crack.
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Abstract Flutter of a crack tip occurs when the relatively flexible tip collides with density fluctuations in a solid. The crack velocity must exceed a critical value. The crack tip behaves like a self-excited oscillator. Its fundamental frequency can be estimated using Friedel's dislocation model of a crack.
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Mode I crack tip fields with incomplete crack tip plasticity in plane stress
Journal of the Mechanics and Physics of Solids, 1999zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Sham, T.-L., Hancock, J. W.
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A hybrid crack tip element containing a strip-yield crack-tip plasticity model
Engineering Fracture Mechanics, 2014Abstract This paper presents a model for the simulation of cracks in thin-walled structures using Trefftz-elements (T-elements) for crack tip regions. These elements are based on exact solutions to the governing differential equations and inner boundary conditions, resulting in high resolutions of the stress/strain fields. The T-elements are combined
K. Kunter +3 more
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