Results 211 to 220 of about 1,119 (244)
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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 ...
Song, J. +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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On the Role of Microdefects in Crack Tip Shielding and Amplification
Durability of Composite Materials, 1994Abstract The interaction of cracks with various microdefects such as microcracks, microvoids, transformed inclusions and reinforcing fibers plays an important role in the micromechanics modeling of toughening mechanisms in advanced composite materials.
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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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Engineering Analysis with Boundary Elements, 2014
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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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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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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 ...
R Onodera, Kenji Higashida
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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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Crack Tip Shielding in 2090 Al-Li Alloy
1996Thermal dependency of fracture toughness as a function of normal cracking and cold pre-stressing (CPS) conditions at the 173 K is studied in 2090 Al-Li alloy. It was found that fracture toughness increases with decreasing temperature for L-T orientation.
Arie Bussiba, Moshe Kupiec, Yosef Katz
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Crack-tip stress shielding by a hard fiber in β-SiC: an atomistic study
Computer Physics Communications, 2005Abstract We present and discuss the application of large-scale molecular dynamics simulations addressed to investigate the interaction between a crack tip and a hard inclusion in monocrystalline β -SiC. We study the Griffith criterion for the stability of an isolated crack.
Alessandro Mattoni +2 more
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