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Effectiveness of diffuse ultrasound for evaluation of micro-cracking damage in concrete
Cement and Concrete Research, 2019 The main objective of this research is to investigate the applicability of diffuse ultrasound to the evaluation of distributed micro-cracking damage in concrete.
Eunjong Ahn +2 more
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Simulation of Polycrystalline Ceramics with Micro-Cracks
MRS Proceedings, 2002AbstractThe micro FEM model, which was considered in the middle bottom of a four-point bending macro FEM model, was constructed from a SEM micrograph of an Al2O3-10vol%ZrO2 ceramic, in which the crystallographic information was given to each grain randomly. One micro-crack was introduced in the micro FEM model as a basic case to simulate the four-point
Jianwu Cao +3 more
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Ultrasonic Evaluation of Ceramics With Micro-Cracks
Emerging Technology in Fluids, Structures, and Fluid Structure Interactions, 2003Materials used in high-pressure vessels may be subjected to rapid temperature change, which may induce micro-cracks on the surface and into material. The growth of micro-cracks is detrimental to facility life. Chromium carbide (Cr3C2) has been proved to be a potential structural material for toughening alumina in biomedical and industrial applications ...
Shih-Jeh Wu +2 more
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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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On the sink strength and permeability of micro-cracked arrays
Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2003Summary: The effective absorption coefficient (the sink strength or the trapping constant) \(\gamma\) of a statistically isotropic random array of penny-shaped cracks is considered. The cracks are treated as oblate spheroids with vanishing aspect ratio.
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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 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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Detection and monitoring of surface micro-cracks by PPP-BOTDA
Applied Optics, 2015Appearance of micrometer size surface cracks is common in structural elements such as welded connections, beams, and gusset plates in bridges. Brillouin scattering-based sensors are capable of making distributed strain measurements. Pre-pump-pulse Brillouin optical time domain analysis (PPP-BOTDA) provides a centimeter-level spatial resolution, which ...
Dewei, Meng, Farhad, Ansari, Xin, Feng
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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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Micro crack detection with Dijkstra’s shortest path algorithm
Machine Vision and Applications, 2011A package based on the free software R is presented which allows the automatic detection of micro cracks and corresponding statistical analysis of crack quantities. It uses a shortest path algorithm to detect micro cracks in situations where the cracks are surrounded by plastic deformations and where a discrimination between cracks and plastic ...
Christina Gunkel +3 more
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