Results 201 to 210 of about 573 (225)
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Strategy of plasticity induced crack closure numerical evaluation
Theoretical and Applied Fracture Mechanics, 2019Abstract A propagating fatigue crack may be partly retarded thanks to a phenomenon called fatigue crack closure. The ability to accurately describe this phenomenon is of interest for the scientific and engineering community, because of its significant impact on the fatigue crack propagation rate.
Tomáš Oplt +5 more
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Estimation of plasticity-induced crack closure in a pre-existing plastic zone
International Journal of Fatigue, 1996Abstract To estimate the plasticity-induced crack closure in a pre-existing plastic zone using Newman's strip-yield model, the interactions between the crack plasticity and the pre-existing plasticity must be known. In the current study, the total plasticity of a fatigue crack propagating in a pre-existing overload plastic zone and a notch plastic ...
C HOU, J CHARNG
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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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Numerical study of the effect of plastic wake on plasticity‐induced fatigue crack closure
Fatigue & Fracture of Engineering Materials & Structures, 2009ABSTRACTFatigue crack closure is strongly influenced by the plastic wake developed because of the action of precedent cycles. It is related to the load sequence and is an additional difficulty for its determination. Finite‐element method has been an alternative for the study of crack closure, commonly in constant‐amplitude loading.
A. GONZALEZ‐HERRERA, J. ZAPATERO
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Plasticity Induced Fatigue Crack Closure
1988Experimental measurements of plasticity-induced crack closure related factors were made on the aluminum alloy 7091-T7E69 using high resolution microscopy techniques. Two stress intensity factors were examined at a stress ratio of 0.1. The length of open crack as a function of load magnitude and the load required to open the crack to its tip were ...
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Dynamic Analysis of Plasticity-Induced Fatigue Crack Closure
1989Crack closure during fatigue crack propagation is a phenomenon widely investigated in the last years by experimental means. Researches have achieved the knowledge of the different causes of the problem: the roughness-induced crack closure, the oxide -induced crack closure, the compressive stresses in the plastic zone near the crack tip produced by ...
J. Llorca, V. Sanchez-Galvez
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Effect of Underloads on Plasticity-Induced Crack Closure: A Numerical Analysis
Journal of Engineering Materials and Technology, 2019The effect of underloads is mostly quantified by the averaged effect on the fatigue crack growth rate, and the transient behavior is rarely investigated. The objective of this paper is to study the mechanisms behind the effect of underloads, periodic underloads, and underloads combined with overloads.
F. V. Antunes +3 more
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Three-Dimensional aspects of plasticity-induced fatigue crack closure
Engineering Fracture Mechanics, 1989A three-dimensional elastoplastic finite element analysis of fatigue crack growth and closure in a center-crack tension specimen was performed in order to investigate the crack opening stress as a function of specimen thickness under constant amplitude loading conditions. Elastic-perfectly plastic conditions were assumed and cycle loading was kept at R
R.G. Chermahini +3 more
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Transient behaviour in the numerical analysis of plasticity induced crack closure
Fatigue & Fracture of Engineering Materials & Structures, 2013ABSTRACTA transient behaviour is observed in the numerical analysis of plasticity induced crack closure at the beginning of crack propagation, as the residual plastic field is being formed. The extent of crack propagation prior to plasticity induced crack closure measurement has a major influence on the accuracy of numerical prediction and on ...
Antunes Fv +3 more
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Plasticity Induced Crack Closure under Plane Strain Conditions
Key Engineering Materials, 2011Plasticity Induced Crack Closure (PICC) is a main phenomenon affecting fatigue crack growth and must be included in the design of components. The objective of the present paper is to study the level of PICC under plane strain conditions. The numerical parameters were identified and optimized. The effects of load level and material model were studied.
Fernando Antunes +2 more
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