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Computational Methods for Fracture

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ISBN: 9783039216864 9783039216871 Year: Pages: 404 DOI: 10.3390/books978-3-03921-687-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Computer Science
Added to DOAB on : 2019-12-09 11:49:16
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Abstract

This book offers a collection of 17 scientific papers about the computational modeling of fracture. Some of the manuscripts propose new computational methods and/or how to improve existing cutting edge methods for fracture. These contributions can be classified into two categories: 1. Methods which treat the crack as strong discontinuity such as peridynamics, scaled boundary elements or specific versions of the smoothed finite element methods applied to fracture and 2. Continuous approaches to fracture based on, for instance, phase field models or continuum damage mechanics. On the other hand, the book also offers a wide range of applications where state-of-the-art techniques are employed to solve challenging engineering problems such as fractures in rock, glass, concrete. Also, larger systems such as fracture in subway stations due to fire, arch dams, or concrete decks are studied.

Keywords

plate --- FSDT --- HSDT --- Mindlin --- incompatible approximation --- fracture --- screened-Poisson model --- gradient-enhanced model --- damage-plasticity model --- implicit gradient-enhancement --- rock --- shear failure --- elastoplastic behavior --- extended scaled boundary finite element method (X-SBFEM) --- stress intensity factors --- fracture process zone (FPZ) --- thermomechanical analysis --- moderate fire --- finite element simulations --- metallic glass matrix composite --- finite element analysis --- shear band --- microstructure --- ductility --- peridynamics --- fatigue --- rolling contact --- damage --- rail squats --- cracks --- steel reinforced concrete frame --- reinforced concrete core tube --- progressive collapse analysis --- loss of key components --- self-healing --- damage-healing mechanics --- super healing --- anisotropic --- brittle material --- Brittle Fracture --- cell-based smoothed-finite element method (CS-FEM) --- Phase-field model --- ABAQUS UEL --- the Xulong arch dam --- yielding region --- cracking risk --- overall stability --- dam stress zones --- concrete creep --- prestressing stress --- compressive stress --- FE analysis --- force transfer --- grouting --- fracture network modeling --- numerical simulation --- fluid–structure interaction --- bulk damage --- brittle fracture --- rock fracture --- random fracture --- Mohr-Coulomb --- Discontinuous Galerkin --- EPB shield machine --- conditioned sandy pebble --- particle element model --- parameters calibration --- geometric phase --- photonic orbital angular momentum --- topological insulator --- topological photonic crystal --- fatigue crack growth --- surface crack --- crack shape change --- three-parameter model --- LEFM --- XFEM/GFEM --- SBFEM --- phase field --- n/a

Gas Flows in Microsystems

Authors: ---
ISBN: 9783039215423 9783039215430 Year: Pages: 220 DOI: 10.3390/books978-3-03921-543-0 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General)
Added to DOAB on : 2019-12-09 11:49:16
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Abstract

The last two decades have witnessed a rapid development of microelectromechanical systems (MEMS) involving gas microflows in various technical fields. Gas microflows can, for example, be observed in microheat exchangers designed for chemical applications or for cooling of electronic components, in fluidic microactuators developed for active flow control purposes, in micronozzles used for the micropropulsion of nano and picosats, in microgas chromatographs, analyzers or separators, in vacuum generators and in Knudsen micropumps, as well as in some organs-on-a-chip, such as artificial lungs. These flows are rarefied due to the small MEMS dimensions, and the rarefaction can be increased by low-pressure conditions. The flows relate to the slip flow, transition or free molecular regimes and can involve monatomic or polyatomic gases and gas mixtures. Hydrodynamics and heat and mass transfer are strongly impacted by rarefaction effects, and temperature-driven microflows offer new opportunities for designing original MEMS for gas pumping or separation. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel theoretical and numerical models or data, as well as on new experimental results and technics, for improving knowledge on heat and mass transfer in gas microflows. Papers dealing with the development of original gas MEMS are also welcome.

Keywords

pressure drop --- microchannels --- heat sinks --- slip flow --- electronic cooling --- Knudsen pump --- thermally induced flow --- gas mixtures --- direct simulation Monte Carlo (DSMC) --- microfluidic --- rarefied gas flows --- micro-scale flows --- Knudsen layer --- computational fluid dynamics (CFD) --- OpenFOAM --- Micro-Electro-Mechanical Systems (MEMS) --- Nano-Electro-Mechanical Systems (NEMS) --- backward facing step --- gaseous rarefaction effects --- fractal surface topography --- modified Reynolds equation --- aerodynamic effect --- bearing characteristics --- underexpansion --- Fanno flow --- flow choking --- compressibility --- binary gas mixing --- micro-mixer --- DSMC --- splitter --- mixing length --- control mixture composition --- preconcentrator --- microfluidics --- miniaturized gas chromatograph --- BTEX --- PID detector --- ultraviolet light-emitting diode (UV LED) --- spectrophotometry --- UV absorption --- gas sensors --- Benzene, toluene, ethylbenzene and xylene (BTEX) --- toluene --- hollow core waveguides --- capillary tubes --- gas mixing --- pulsed flow --- modular micromixer --- multi-stage micromixer --- modelling --- photoionization detector --- microfluidics --- microfabrication --- volatile organic compound (VOC) detection --- toluene --- supersonic microjets --- Pitot tube --- Knudsen pump --- thermal transpiration --- vacuum micropump --- rarefied gas flow --- kinetic theory --- microfabrication --- photolithography --- microfluidics --- resonant micro-electromechanical-systems (MEMS) --- micro-mirrors --- out-of-plane comb actuation --- fluid damping --- analytical solution --- FE analysis --- miniaturization --- gas flows in micro scale --- measurement and control --- integrated micro sensors --- advanced measurement technologies --- n/a

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MDPI - Multidisciplinary Digital Publishing Institute (2)


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CC by-nc-nd (2)


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english (2)


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2019 (2)