Results 161 to 170 of about 12,651 (176)
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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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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 Metal-Matrix Composites: Modelling Of Crack Bridging by Uncracked Ligaments
MRS Proceedings, 1988AbstractAs part of an investigation into the micro-mechanisms of crack-tip shielding associated with the growth of fatigue cracks in metal-matrix composites, simple models are developed for the role of crack bridging in high-strength aluminum alloys reinforced with SiC particulate (AI/SiCp). Based on experimental observations of crack growth, crack-tip
Jian Ku Shang, R. O. Ritchie
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Engineering Fracture Mechanics, 1989
Abstract Fatigue crack propagation behavior has been examined in a 2024-T3 aluminum alloy/aramid-fiber epoxy 3 2 laminated composite, ARALL®-2 LAMINATE, with the objective of quantitatively evaluating the primary mechanisms of crack-tip shielding.
R.O Ritchie, Weikang Yu, R.J Bucci
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Abstract Fatigue crack propagation behavior has been examined in a 2024-T3 aluminum alloy/aramid-fiber epoxy 3 2 laminated composite, ARALL®-2 LAMINATE, with the objective of quantitatively evaluating the primary mechanisms of crack-tip shielding.
R.O Ritchie, Weikang Yu, R.J Bucci
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Crack tip dislocations and their shielding effect in MgO thin crystals
Materials Science and Engineering: A, 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 ...
K. Higashida +5 more
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Crack tip shielding by asperity contact as determined by acoustic measurements
Engineering Fracture Mechanics, 1987Abstract Asperity contact along the fracture surface of a crack is one of the mechanisms of crack closure. This contact shields the crack tip, in part, from the externally applied driving force. We have now succeeded in using information from acoustic transmission and diffraction experiments, obtained under plane strain conditions, to determine the ...
O. Buck, D.K. Rehbein, R.B. Thompson
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Complete Crack-Tip Shielding of the Mode III Crack in a Work-Hardening Solid
Journal of Applied Mechanics, 1991The crack-tip shielding stress intensity factor L, for the mode III crack in a work-hardening solid is equal to L = - K, where K is the applied stress intensity factor. That is, the crack tip is perfectly shielded. This result is shown two ways: from the dislocation shielding and from the dislocation crack extension force.
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PHOTOELASTIC ANALYSIS OF CRACK TIP SHIELDING AFTER AN OVERLOAD
2009The mechanism underlying the plasticity induced shielding of a crack tip during fatigue was experimentally investigated by means of photo-elasticity and by a recently-developed mathematical model which considers the stress field near the crack tip and along the flanks.
COLOMBO, CHIARA +2 more
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Inclined Dislocation Emission at a Shielded Crack Tip*
2023S. -J. Chang, S. M. Ohr
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Shielding of Crack Tips by Dislocations
International Journal of Materials Research, 1984openaire +1 more source