Results 241 to 250 of about 1,571 (276)
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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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Fatigue and Fracture of Engineering Materials and Structures, 2018 This work explores the contribution to crack growth rate acceleration and deceleration that arises from plasticity-induced shielding during an overload cycle.
J M Vasco-Olmo +2 more
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Multiscale simulation of crack tip shielding by a dislocation
Acta Materialia, 2008Crack tip shielding by dislocations is an essential feature of the modeling of semi-brittle crack propagation and the brittle to ductile transition. The stress field, in the elementary configuration where a single dislocation interacts with a crack, is obtained by two independent methods, at two different scales. Analytical formulas, by Lin and Thomson,
D. Tanguy +2 more
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Crack Tip Shielding from a Plastic ‘Inclusion’
Key Engineering Materials, 2011This paper presents a very brief overview of the philosophy underlying a plastic inclusion approach to defining the boundary stresses imposed on the applied elastic stress or displacement field by the plastic deformation attendant on crack growth in a ductile material. It leads to two new fracture mechanics parameters, KR and KS.
M. Neil James +4 more
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Fatigue crack growth and craze-induced crack tip shielding in polycarbonate
Polymer, 2012Abstract This paper expounds a revised characterisation of the elastic stresses ahead of a crack tip in polycarbonate which takes account of the elastic–plastic boundary stresses induced by the presence of the crazed region that surrounds a crack.
M.N. James +3 more
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