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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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Dislocation crack tip shielding and the Paris exponent
Materials Science and Engineering: A, 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 ...
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Dislocation shielding and crack tip decohesion at the atomic scale
Acta Materialia, 2010Anti-shielding of a crack tip by a dislocation is examined at the atomistic level for a simple geometry to test classical singular-crack and recent cohesive-crack models of crack/dislocation interactions. The atomistic model shows that, as an anti-shielding dislocation approaches the crack tip, It causes less anti-shielding than predicted by the ...
J. Song +3 more
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Journal of Mechanical Science and Technology, 2012
In this letter, the shielding or anti-shielding effect is firstly applied to obtain the behavior of two parallel cracks in a two-dimensional type-II superconducting under electromagnetic force. Fracture analysis is performed by the finite element method and the magnetic behavior of superconductor is described by the critical state Bean model.
Zhi-Wen Gao, Kang Yong Lee, You-He Zhou
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In this letter, the shielding or anti-shielding effect is firstly applied to obtain the behavior of two parallel cracks in a two-dimensional type-II superconducting under electromagnetic force. Fracture analysis is performed by the finite element method and the magnetic behavior of superconductor is described by the critical state Bean model.
Zhi-Wen Gao, Kang Yong Lee, You-He Zhou
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Stress intensity factors for crack tip shielding or anti-shielding by impurity atoms
International Journal of Fracture, 1986The average value of the crack tip stress intensity factor produced by a row of impurity atoms is calculated in this paper. The row of impurity atoms lies parallel to the crack front and is situated at an arbitrary position about a crack. The impurity atom produced mode I shielding/antishielding stress intensity factor LiI for a row of impurity atoms ...
J. Weertman, J. E. Hack
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Crack-Tip Shielding Effect on Fatigue Crack Propagation in Porous Silicon Carbide
Applied Mechanics and Materials, 2011A sharply notched specimen of porous silicon carbide with porosity of 37% was fatigued under four-point bending. The opening displacement of a fatigue crack was measured at several positions along cracks by using scanning electron microscopy. The crack propagation curve was divided into stages I, II, and III.
Keisuke Tanaka, Yasuki Kita
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Engineering Analysis with Boundary Elements, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jun Lei +2 more
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zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jun Lei +2 more
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On crack tip shielding due to plasticity‐induced closure during an overload
Fatigue & Fracture of Engineering Materials & Structures, 2010ABSTRACTThe mechanisms underlying the plasticity‐induced shielding of a crack tip during fatigue are investigated at both constant amplitude loading and in a case with a substantial single‐cycle overload. A recently developed mathematical model of the stress field around the crack was fitted to maps of isochromatic fringe data obtained from phase ...
COLOMBO, CHIARA +4 more
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