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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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Acoustic detection of micro-cracks in small electronic devices
Microelectronics Reliability, 2014Abstract We demonstrate the feasibility of in-situ acoustic detection of micro-cracks in small electronic devices. Applying precisely controlled damage to test vehicles using a nanoindenter, we record brittle fracture of thin layers by means of an ultra-sound piezo sensor, which is able to detect micro-cracks in the moment they emerge.
Georg Michael Reuther +2 more
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Micro-cracking of tooth structure.
American journal of dentistry, 2005To determine if the cutting procedure utilized in producing a cavity preparation, i.e., a high speed dental handpiece or an Er:YAG laser may be a factor in initiating the formation of micro-cracks during or after preparation of the cavity and before and after placing and curing the dental composite.Class I occlusal and Class II MOD preparations were ...
Christina, Sehy, James L, Drummond
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A computational model of peridynamic theory for deflecting behavior of crack propagation with micro-cracks [PDF]
Computational Materials Science, 2019 The critical effect of micro level defects should be examined at macro level to better understand the fracture behaviors of engineering materials. This study investigates the branching and deflecting behavior of a macro (main) crack in presence of ...
Muhammed Fatih Basoglu +2 more
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Observations on the nature of micro-cracking in brittle composites
Journal of Materials Science, 1981The degree of micro-cracking in BeO-SiC composites due to internal stresses which arise from the mismatch in the coefficients of thermal expansion was monitored by measurements of the thermal diffusivity by the laser-flash technique. The experimental results indicated that micro-cracking was most extensive at approximately 30 and 80 wt% SiC and a ...
J. P. Singh +4 more
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On the study of the initiation of the micro crack on the smooth surface of polycrystalline
Applied Mathematics and Mechanics, 2004zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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On the stress field near the micro-crack tip
Physica Status Solidi (a), 1993In this paper a molecular dynamic (MD) simulation is conducted to analyze the stress field near a micro-crack tip. The model material for simulation is a single crystal of aluminum. A bulk of 5460 atoms is used to simulate a micro-crack. The interatomic potential of aluminum is calculated by the pseudopotential method of the Krasko-Gurskii model which ...
Shouxin Li +4 more
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