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Tragverhalten von biegebeanspruchten Stahlmasten mit polygonalen Querschnitten

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Book Series: Berichte zum Stahl- und Leichtbau / Karlsruher Institut für Technologie, Versuchsanstalt für Stahl, Holz und Steine, Stahl- und Leichtbau ISSN: 21987912 ISBN: 9783731503989 Year: Volume: 2 Pages: getr. Zählung DOI: 10.5445/KSP/1000047608 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
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This work deals with the bending moment capacity of thin-walled steel poles with polygonal sections. Based on experimental and numerical investigations the bearing behavior of steel poles in bending with polygonal sections with an arbitrary number of corners up to the transition from a polygonal section to a round section is presented. Thereby the bearing behavior as a shell and the influence of imperfections are considered.

Modeling and Experimental Characterization of Nanocomposite Materials

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ISBN: 9783039286324 / 9783039286331 Year: Pages: 130 DOI: 10.3390/books978-3-03928-633-1 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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This Special Issue gathers research from different branches of science and engineering disciplines working on experiments and modelling of nanocomposites into one volume. The Guest Editor welcomes papers dedicated to experimental, computational, and theoretical aspects dealing with many important state-of-the-art technologies and methodologies regarding the synthesis, fabrication, characterization, properties, design, and applications, and both finite element analysis and molecular dynamic simulations, of nanocomposite materials and structures. Full papers covering novel topics, extending the frontiers of the science and technology of nanoreinforced composites are encouraged. Reviews covering topics of major interest will be also considered.

Creep and High Temperature Deformation of Metals and Alloys

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ISBN: 9783039218783 9783039218790 Year: Pages: 212 DOI: 10.3390/books978-3-03921-879-0 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Mining and Metallurgy
Added to DOAB on : 2020-01-07 09:08:26
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By the late 1940s, and since then, the continuous development of dislocation theories have provided the basis for correlating the macroscopic time-dependent deformation of metals and alloys—known as creep—to the time-dependent processes taking place within the metals and alloys. High-temperature deformation and stress relaxation effects have also been explained and modeled on similar bases. The knowledge of high-temperature deformation as well as its modeling in conventional or unconventional situations is becoming clearer year by year, with new contemporary and better performing high-temperature materials being constantly produced and investigated.This book includes recent contributions covering relevant topics and materials in the field in an innovative way. In the first section, contributions are related to the general description of creep deformation, damage, and ductility, while in the second section, innovative testing techniques of creep deformation are presented. The third section deals with creep in the presence of complex loading/temperature changes and environmental effects, while the last section focuses on material microstructure–creep correlations for specific material classes. The quality and potential of specific materials and microstructures, testing conditions, and modeling as addressed by specific contributions will surely inspire scientists and technicians in their own innovative approaches and studies on creep and high-temperature deformation.

Advances in Wood Composites

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ISBN: 9783039285846 / 9783039285853 Year: Pages: 210 DOI: 10.3390/books978-3-03928-585-3 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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Wood composites have shown very good performance, and substantial service lives when correctly specified for the exposure risks present. Selection of an appropriate product for the job should be accompanied by decisions about the appropriate protection, whether this is by design, by preservative treatment or by wood modification techniques. This Special Issue, Advances in Wood Composites presents recent progress in enhancing and refining the performance and properties of wood composites by chemical and thermal modification and the application of smart nanomaterials, which have made them a particular area of interest for researchers. In addition, it reviews some important aspects in the field of wood composites, with particular focus on their materials, applications, and engineering and scientific advances, including solutions inspired biomimetrically by the structure of wood and wood composites. This Special Issue, with a collection of 13 original contributions, provides selected examples of recent Advances in Wood Composites

Keywords

wood --- thermal modification --- mechanical properties --- dimensional stability --- color --- chemical structure --- VOCs --- alder plywood --- high-density polyethylene film --- bending strength --- modulus of elasticity in bending --- shear strength --- thickness swelling --- water absorption --- activation volume --- creep behavior --- sol-gel process --- stepped isostress method --- wood-inorganic composites --- wood adhesive --- tunnel-structured --- sepiolite --- rapid formaldehyde release --- wood plastic composite --- graphene nano-platelets --- thermal property --- mechanical property --- water-based UV curing coating --- coating amount --- surface properties --- polyurethane-acrylate --- oak (Quercus alba L.) --- bamboo --- carbothermal reduction --- ceramic --- silicon carbide --- sol–gel process --- thermal modification --- nanocompounds --- mechanical and physical properties --- cellulose --- crystallinity --- biorefinery lignin --- wood panels --- sustainable adhesives --- adhesive penetration --- particleboard properties --- formaldehyde emissions --- bamboo --- chemical modification --- dimensional stability --- dynamic thermodynamic --- acetic anhydride --- methyl methacrylate --- polymer-triticale boards --- thermoplastic polymers --- straw --- hydrophobicity --- mechanical properties --- oriented strand lumber (OSL) --- nanowollastonite --- mechanical and physical properties --- UF resin --- buckling --- WPC --- HDPE --- Southwell’s method --- finite element analysis --- Abaqus --- aquacultural --- structural analysis --- wood --- plastic --- composite --- n/a

Advancements in Gel Science—A Special Issue in Memory of Toyoichi Tanaka

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ISBN: 9783039213436 9783039213443 Year: Pages: 178 DOI: 10.3390/books978-3-03921-344-3 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Technology
Added to DOAB on : 2019-12-09 11:49:15
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A gel is a state of matter that consists of a three-dimensional cross-linked polymer network and a large amount of solvent. Because of their structural characteristics, gels play important roles in science and technology. The science of gels has attracted much attention since the discovery of the volume phase transition by Professor Toyoichi Tanala at MIT in 1978. MDPI planned to publish a Special Issue in Gels to celebrate the 40th anniversary of this discovery, which received submissions of 13 original papers and one review from various areas of science. We believe that readers will find this Special Issue informative as to the recent advancements of gel research and the broad background of gel science.

Keywords

gel --- thermoresponsive property --- monomer sequence --- co-crosslinking --- copolymerization --- acrylamide derivative --- swelling --- volume phase transition --- agarose gel --- compression --- solvent transport --- sucrose --- xylitol --- volume phase transition --- effects of electric charge --- swelling of thermosensitive gels --- sol-gel transition --- site-bond correlated-percolation model for polymer gelation --- gelation temperature --- cloud point temperature --- spinodal temperature --- spinodal decomposition --- janus particle --- anisotropic shape --- phase separation --- wetting --- micrometric confinement --- micropipette aspiration --- PVA gel --- gamma ray sterilization --- artificial hydrogel cartilage --- frictional property --- wear --- xerogel --- Brunauer-Emmett-Teller theory --- Barrett-Joyner-Halenda analysis --- temperature --- solids content --- drying --- solvent exchange --- microgel --- electrophoresis --- light scattering --- paint coating --- wrinkle --- swelling --- buckling --- Sephadex® (crosslinked dextran) --- crosslink density (density of crosslinks) --- ice grain --- ice crystallization during rewarming --- glassy water --- X-ray CT --- XRD --- poly(vinyl alcohol) --- chemical gel --- microcrystallite --- hydrogen bond --- swelling behavior --- hysteresis --- hydrogel --- friction --- fatigue --- wear --- fracture --- crack --- adhesion --- delamination --- poly (acryl amide) gel --- time domain reflectometry (TDR) of dielectric spectroscopy --- pulse field gradient spin echo method of nuclear magnetic resonance (PFG-NMR) --- scaling analysis --- fractal analysis --- heterogeneous gelation dynamics --- moving boundary picture --- phase transition dynamics --- kinetic coefficient --- blood coagulation --- n/a

Advances in Mechanical Problems of Functionally Graded Materials and Structures

Authors: --- --- ---
ISBN: 9783039216581 9783039216598 Year: Pages: 262 DOI: 10.3390/books978-3-03921-659-8 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Mathematics
Added to DOAB on : 2019-12-09 11:49:16
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The book deals with novel aspects and perspectives in functionally graded materials (FGMs), which are advanced engineering materials designed for a specific performance or function with spatial gradation in structure and/or composition. The contributions mainly focus on numerical simulations of mechanical properties and the behavior of FGMs and FGM structures. Several advancements in numerical simulations that are particularly useful for investigations on FGMs have been proposed and demonstrated in this Special Issue. Such proposed approaches provide incisive methods to explore and predict the mechanical and structural characteristics of FGMs subjected to thermoelectromechanical loadings under various boundary and environmental conditions. The contributions have resulted in enhanced activity regarding the prediction of FGM properties and global structural responses, which are of great importance when considering the potential applications of FGM structures. Furthermore, the presented scientific scope is, in some way, an answer to the continuous demand for FGM structures, and opens new perspectives for their practical use.

Keywords

functionally graded beams --- different moduli in tension and compression --- bimodulus --- analytical solution --- neutral layer --- quadratic solid–shell elements --- finite elements --- functionally graded materials --- thin structures --- geometrically nonlinear analysis --- functionally graded piezoelectric materials --- circular plate --- combined mechanical loads --- electroelastic solution --- ANFIS --- fuzzy logic --- clustering --- neural networks --- robotics and contact wear --- evanescent wave --- polynomial approach --- functionally graded piezoelectric-piezomagnetic material --- dispersion --- attenuation --- functional graded saturated material --- inhomogeneity --- Love wave --- dispersion --- attenuation --- porous materials --- truncated conical sandwich shell --- metal foam core layer --- non-linear buckling analysis --- orthogonal stiffener --- elastic foundation --- functionally graded plate --- power-law distribution --- high order shear deformation theory --- elastic foundation --- stepped FG paraboloidal shell --- general edge conditions --- spring stiffness technique --- free vibration characteristics --- Lamb wave --- functionally graded viscoelastic material --- minimum module approximation method --- damping coefficient --- functionally graded materials --- finite element analysis --- graded finite elements --- functionally graded materials --- inhomogeneous composite materials --- material design --- stress concentration factor --- failure and damage --- elliptical hole --- finite element method --- hollow disc --- external pressure --- residual stress --- residual strain --- flow theory of plasticity --- functionally graded materials --- elastoplastic analysis --- pure bending --- residual stress --- large strain

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