Results 241 to 250 of about 12,878 (286)
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Crack-tip amplification and shielding by micro-cracks in piezoelectric solids – Part I: Static case
Engineering Analysis With Boundary Elements, 2013zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jun Lei +2 more
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Crack tip dislocations and their shielding effect in MgO thin crystals
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 1997Crack tip shielding by dislocations has been studied using the method of 3-dimensional stress analyses in connection with dislocation structures observed by HVEM in MgO thin crystals. A screw dislocation array corresponding to the plastic zone of 45°-shear-type is commonly observed along the [100] direction ahead of the (010) crack in (001) thin plate ...
Norihiko Narita
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Maximal Crack Tip Shielding by Microcracking
Journal of Applied Mechanics, 1989It is shown here that the shielding effect of a distribution of microcracks, i.e., the extent to which they alleviate the severity of a near-tip singular field, is maximized when the microcracks develop normal to the direction of maximum tension. In passing, we derive mode I asymptotic solutions for a class of anisotropic damage models.
M. Ortiz, A. E. Giannakopoulos
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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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The shielding effects of the crack-tip plastic zone
International Journal of Fracture, 2010zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhu, P., Yang, L., Li, Z., Sun, J.
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Crack tip shielding/antishielding by impurity atoms
International Journal of Fracture, 1988The impurity crack tip shielding/antishielding stress intensity factor is found for equilibrium impurity concentrations near the crack tip for a crack tip with or without a plastic zone. It is found that the impurity atoms produce either no shielding/antishielding stress intensity factor or only a very small shielding/antishielding stress intensity ...
J. Weertman, J. E. Hack
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Shielding of crack tips by inclined pileups of dislocations
Acta Metallurgica, 1988Abstract A mathematical formulation is developed for a long crack (mode III) with two symmetrical screw dislocation pileups inclined to the crack by an angle φ. Dislocation free zones (DFZ) are allowed at the crack up. The resulting series of equations are solved numerically.
C.S. Pande, R.A. Masumura, Y.T. Chou
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Crack Tip Dislocations and its Shielding Effect
Materials Science Forum, 2007Two dimensional simulations of discrete dislocation dynamics were carried out to clarify a shielding effect due to dislocations at a crack tip. The configuration of dislocations around the crack tip was calculated under the conditions of mode I tensile load at high temperatures.
Masaki Tanaka +3 more
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Crack tip shielding by micro-cracking in brittle solids
Acta Metallurgica, 1987Abstract The effect of profuse micro-cracking at the tip of a macroscopic crack is studied with emphasis on the reduction in stress intensity, or shielding, within the micro-crack region. Shielding contributions arise from two consequences of micro-cracking, reduction in stiffness and release of residual stress. For the most part the study is limited
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Ultrasonic measurements of crack tip shielding by closure
Materials Science and Engineering: A, 1988Abstract During fatigue, an existing crack closes partially owing to the compressive stresses set up by the deformed material. It is well established that this crack closure can have pronounced effects on the rate of crack propagation and thus on fatigue life.
O. Buck, R.B. Thompson, D.K. Rehbein
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