Results 191 to 200 of about 1,119 (244)
Dental Materials, 2018 To quantify the extent of crack-tip plasticity, crack opening displacement (COD) and crack bridging for crack growth perpendicular (HAH) and parallel (RAR) to the tubules in elephant dentin under both hydrated and dry conditions to better understand their influence on intrinsic and extrinsic toughening during crack growth.Compact tension test-pieces ...
Philip Withers +2 more
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Assessment of crack tip plastic zone size and shape and its influence on crack tip shielding [PDF]
Fatigue and Fracture of Engineering Materials and Structures, 2016 AbstractThis paper presents a novel methodology for the experimental quantification of the crack tip plastic zone during fatigue crack growth. It is based on the application of yielding criteria to estimate the area and shape of the crack tip plastic zone using both the von Mises and Tresca yield criteria.
Eann Patterson
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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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On the Crack Tip Shielding in Particle Reinforced Composites
Materials Science Forum, 2005The paper is focused on crack-tip shielding effects caused by crack deflection (tilting) processes in particle reinforced composites. A numerical analysis by means of the ANSYS code was employed in order to assess these effects caused by rigid particles and holes in the matrix.
Pavel Šandera +2 more
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A numerical and experimental study of crack tip shielding in presence of overloads
Engineering Fracture Mechanics, 2010Abstract The mechanism underlying plasticity-induced shielding of a crack tip under fatigue loading has been already experimentally investigated by means of photoelasticity using a recently-developed mathematical model which considers stress field near the crack tip and along the flanks.
Chiara Colombo, Laura Vergani
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Dislocation crack tip shielding and the Paris exponent
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2007Abstract In a previous paper we considered how the crack blunting dislocation emission mechanism likely leads to a Paris fatigue crack growth rate law exponent n = 2 if dislocation shielding is not important and showed how dislocation crack tip shielding can cause a reduction in the fatigue crack growth rate and showed qualitatively how it ...
Johannes Weertman
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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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International Journal of Solids and Structures, 2009 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yong-Dong Li
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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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