Results 221 to 230 of about 11,713 (257)
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Hydrogen in steel—the stability of micro-cracks
Acta Metallurgica, 1962Abstract The stability of a wedge shaped microcrack under constant external stress and internal pressure is examined. Some modifications are found necessary in the original analysis of the stability under external stress only; these reinforce the conclusion that a crack formed under tension by the pile-up mechanism will grow unless damped by plastic ...
B.A Bilby, J Hewitt
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A continuum model of micro-cracks in concrete
Continuum Mechanics and Thermodynamics, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Bongué Boma, Malika, Brocato, Maurizio
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Miniaturized magneto-optical imaging sensor for crack and micro-crack detection
Optik, 2020Abstract A highly-sensitive magneto-optical Faraday sensor was miniaturized, including Bi-substituted yttrium iron garnet (Bi: YIG) thin films. The magnetic field over the surface of the cracked steel was measured by using this sensor. The results demonstrated that this sensor could illustrate the micro-cracks on the surface and subsurface of the ...
H. Eftekhari, M.M. Tehranchi
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A Microstructural Model for Micro-Cracking in Piezoceramics
Key Engineering Materials, 2018Piezoelectric ceramics are employed in several applications for their capability to couple mechanical and electrical fields, which can be advantageously exploited for the implementation of smart functionalities. The electromechanical coupling, which can be employed for fast accurate micro-positioning devices, makes such materials suitable for ...
Benedetti, Ivano +2 more
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Temperature-Dependent Micro-Crack Propagation
RPV Integrity and Fracture Mechanics, 2004The crack-lattice trapping phenomenon introduce by R. Thomson et al[1] is studied for the conditions of the Frenkel-Kontrova-type experiment. By using a new method, which allows further model extension for a finite temperature case we are able to describe an equilibrium crack energetics for arbitrary externa conditions and ascertain the crack ...
Kazuhiro Kitamura, I. L. Maksimov
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Crack arrest testing at the micro-scale
Engineering Fracture Mechanics, 2018Abstract Crack arrest testing of micro-sized cantilever beams (≈8 × 4 × 6 μm, length, width and height, respectively) was conducted in order to evaluate the suitability of a new method to quantify local crack arrest properties. Chevron notched cantilevers were milled to match the (1 0 0)[0 1 ¯ 1] crack system in α-iron, where earlier ...
Brage Dahl Snartland +3 more
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A hybrid micro–macro BEM formulation for micro‐crack clusters in elastic components
International Journal for Numerical Methods in Engineering, 1995AbstractLocal analysis schemes capable of detailed representations of the micro‐features of a problem are integrated with a macro‐scale BEM technique capable of handling complex finite geometries and realistic boundary conditions. The micro‐scale effects are introduced into the macro‐scale BEM analysis through an augmented fundamental solution obtained
Chandra, A. +3 more
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Micro-textural effects on crack initiation and crack propagation of andesitic rocks
Engineering Geology, 2015Abstract The onset of dilation and uniaxial compressive strength (UCS) of rocks are known to be affected by mineralogical, petrographic and microstructural features. Therefore micro-textural variations are essential for understanding variation in strength and failure behaviour of rocks.
Ömer Ündül +3 more
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Micro-facets of crack surfaces in metals
International Journal of Fracture Mechanics, 1968Recent experiments involving the study of crack contours and neighbouring regions in the electron microscope are analyzed. The present work represents an extension of previous investigations on the crystallography of separation. The materials studied are a carbon steel, two austenitic stainless steels, zirconium and zinc.
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