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Crack-Tip Shielding Effect on Fatigue Crack Propagation in Porous Silicon Carbide
Applied Mechanics and Materials, 2011 A 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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Methods for crack opening load and crack tip shielding determination: a review
Fatigue and Fracture of Engineering Materials and Structures, 2003ABSTRACTIn this paper a review of the literature on crack closure/opening load and crack tip shielding effects determination methods is presented. Commonly used ‘subjective’ (visual) and ‘non‐subjective’ approaches have been included. Procedures associated with the determination of an effective crack driving force for both Elber type and that of ...
Daniel Kujawski
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Crack-tip amplification and shielding by micro-cracks in piezoelectric solids – Part I: Static case
Engineering Analysis With Boundary Elements, 2013zbMATH 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, 2010 ABSTRACTThe 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 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 ...
K Higashida, R Onodera
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PHOTOELASTIC ANALYSIS OF CRACK TIP SHIELDING AFTER AN OVERLOAD
, 2009 The 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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A higher order thermoelastic analysis of fatigue crack growth can assess crack tip shielding
Fatigue and Fracture of Engineering Materials and Structures, 2023 T1, Q2 (48/183 en Mechanical Engineering, IF 2023 = 3.1)The present work uses a more accurate thermoelastic formulation than the classical equation, based on the inclusion of a higher order term, to analyze crack tip thermoelastic data.
Alonso Camacho-Reyes +2 more
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Geometrical Shielding Produced by Intergranular Crack-Tip Branching in Fe–V–P Alloy
Key Engineering Materials, 2011 The geometrical shielding produced by intergranular crack-tip branching in the fracture toughness tests of the Fe–V–P alloy is quantitatively assessed particularly with respect to the contribution of crack splitting.
Jana Horníková +2 more
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Maximal Crack Tip Shielding by Microcracking
Journal of Applied Mechanics, 1989It is shown here that the shielding effect of a distribution of microcracks, i.e., the extent to which they alleviate the severity of a near-tip singular field, is maximized when the microcracks develop normal to the direction of maximum tension. In passing, we derive mode I asymptotic solutions for a class of anisotropic damage models.
M. Ortiz, A. E. Giannakopoulos
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Atomic-Scale Mechanism of Crack-Tip Plasticity: Dislocation Nucleation and Crack-Tip Shielding
Physical Review Letters, 1997By isolating the process of dislocation emission from a crack tip under an applied tensile stress, we extract from a molecular dynamics simulation the atomic-level displacement and stress fields on the activated slip plane before and after the nucleation event.
Fabrizio Cleri +3 more
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