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Microstructural modeling and computational homogenization of the physically linear and nonlinear constitutive behavior of micro-heterogeneous materials

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Book Series: Schriftenreihe Kontinuumsmechanik im Maschinenbau / Karlsruher Institut für Technologie, Institut für Technische Mechanik - Bereich Kontinuumsmechanik ISSN: 2192693X ISBN: 9783866446991 Year: Volume: 1 Pages: V, 173 p. DOI: 10.5445/KSP/1000023534 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:01
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Engineering materials show a pronounced heterogeneity on a smaller scale that influences the macroscopic constitutive behavior. Algorithms for the periodic discretization of microstructures are presented. These are used within the Nonuniform Transformation Field Analysis (NTFA) which is an order reduction based nonlinear homogenization method with micro-mechanical background. Theoretical and numerical aspects of the method are discussed and its computational efficiency is validated.

Der Helixaktor - Zum Konzept eines vorverwundenen Biegeaktors

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Book Series: Schriftenreihe des Instituts für Technische Mechanik, Universität Karlsruhe (TH) ISSN: 16143914 ISBN: 9783866442320 Year: Volume: 9 Pages: VIII, 138 p. DOI: 10.5445/KSP/1000007955 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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Biegeaktoren erlauben häufig nur eindimensionale Arbeitsräume. Der Helixaktor ist entlang seiner Stabachse vorverwunden und er kann dadurch zweidimensionale Arbeitsräume realisieren. Die Arbeit skizziert das Konzept des Aktors und seine optimale Gestaltung, sie diskutiert den Arbeitsraum und Wege zur Positionsregelung, insbesondere für lineare Manipulatoren mit redundanten Eingängen. Der Prototyp des Helixaktors wird durch Macro Fiber Composites angetrieben.

Nano- and Microcomposites for Electrical Engineering Applications

ISBN: 9783038422921 9783038422938 Year: Pages: XVI, 286 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General)
Added to DOAB on : 2016-12-05 09:48:54
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In a dedicated Special Issue, the journal Polymers has compiled papers on the current trends and research directions within the preparation, characterization and application of polymer-based composite materials in electrical engineering applications. In recent times, this type of material has evolved to become one of the most thoroughly investigated materials, stimulated by the demand for the resource-efficient assembly of generators, transformers, communication devices, etc. Novel composites are to be used as insulating materials with high thermal conductivity and excellent temperature stability, through which premature ageing and degradation of devices shall be avoided or at least reduced. This Special Issue comprises twelve contributions by internationally renowned researchers; to mention Petru V. Nothinger (University Politehnica of Bucharest), Alun S. Vaughan (University of Southampton), Stanislaw M. Gubanski (Chalmers University of Technology), Michael Muhr (Graz University of Technology), Johan J. Smit (TU Delft), and Ulf W. Gedde (KTH Royal Institute of Technology) as prominent examples. The state-of-the-art research and technology of the area ‘micro- and nanocomposites for electrical engineering applications’ has been summarized in three review articles, while the current research trends and the development and characterization of novel materials have been described in eight original research articles. Stimulated by the vivid current interest in this topic, this Special Issue of Polymers has additionally been compiled in a book version.

10 Análisis no-lineal de materiales compuestos mediante la teoría de mezclas serie-paralelo (Book chapter)

Book title: Aplicaciones avanzadas de los materiales compuestos en la obra civil y la edificación

Authors: --- ---
ISBN: 9788494187292 Year: Pages: 25 Language: Spanish
Publisher: OmniaScience Grant: FP7 Ideas: European Research Council - 320815
Subject: Architecture
Added to DOAB on : 2019-01-17 11:45:55
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This chapter presents the theory of series-parallel mixtures. This is a formulation for the simulation of the mechanical behavior of composite materials, which allows to obtain the non-linear behavior of the same from the behavior that show their component materials. This formulation can be applied to both compounds Laminates of carbon fibers as to more traditional composite materials such as reinforced concrete. The validity of the submitted formulation will be tested with the reproduction of a delamination test of a laminated composite. The advantage of the series-parallel mixing theory versus other existing formulations for the calculation of composite materials is that this is, today, the only one capable of taking into account the non-linear behavior of the compounds with a computational cost that makes possible the resolution of real structures.

ECO-COMPASS

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ISBN: 9783038976905 9783038976912 Year: Pages: 219 DOI: 10.3390/books978-3-03897-691-2 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Media and communication --- Transportation
Added to DOAB on : 2019-08-28 11:21:28
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Today, mainly man-made materials, such as carbon and glass fibers, are used to produce composite parts in aviation. Renewable materials, such as natural fibers or bio-sourced resin systems, have not yet found their way into aviation. The project ECO-COMPASS aims to evaluate the potential applications of ecologically improved composite materials in the aviation sector in an international collaboration of Chinese and European partners. Natural fibers such as flax and ramie will be used for different types of reinforcements and sandwich cores. Furthermore, bio-based epoxy resins to substitute bisphenol-A based epoxy resins in secondary structures are under investigation. Adapted material protection technologies to reduce environmental influence and to improve fire resistance are needed to fulfil the demanding safety requirements in aviation. Modelling and simulation of chosen eco-composites aims for an optimized use of materials while a Life Cycle Assessment aims to prove the ecological advantages compared to synthetic state-of-the-art materials. This Special Issue provides selected papers from the project consortium partners.

Graphene Nanoplatelets

Authors: ---
ISBN: 9783039287949 / 9783039287956 Year: Pages: 140 DOI: 10.3390/books978-3-03928-795-6 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General)
Added to DOAB on : 2020-06-09 16:38:57
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Graphene nanoplatelets (GNPs) have attracted considerable interest due to their exceptional mechanical, electrical, and thermal properties, among others. This book provides a deep review of some aspects related to the characterization of GNPs and their applications as nanoreinforcements for different types of matrices such as polymeric- or cement-based matrices. In this book, the reader will find how these nanoparticles could be used for several industrial applications such as energy production and storage or effective barrier coatings, providing a wide overview of future progress in this topic

Advances in Digital Image Correlation (DIC)

Authors: ---
ISBN: 9783039285143 / 9783039285150 Year: Pages: 252 DOI: 10.3390/books978-3-03928-515-0 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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Digital image correlation (DIC) has become the most popular full field measurement technique in experimental mechanics. It is a versatile and inexpensive measurement method that provides a large amount of experimental data. Because DIC takes advantage of a huge variety of image modalities, the technique allows covering a wide range of space and time scales. Stereo extends the scope of DIC to non-planar cases, which are more representative of industrial use cases. With the development of tomography, digital volume correlation now provides access to volumetric data, enabling the study of the inner behavior of materials and structures.However, the use of DIC data to quantitatively validate models or accurately identify a set of constitutive parameters remains challenging. One of the reasons lies in the compromises between measurement resolution and spatial resolution. Second, the question of the boundary conditions is still open. Another reason is that the measured displacements are not directly comparable with usual simulations. Finally, the use of full field data leads to new computational challenges.

Keywords

super pressure balloon --- stress concentration --- strain --- non-contact measurement --- digital image correlation --- large deformation --- digital image correlation --- multi-perspective --- single camera --- cross dichroic prism --- earthquake rupture --- fault geometry --- spatiotemporal evolution --- strain gage --- spatial sampling rate --- rupture speed --- slip velocity --- high-speed camera --- experimental-numerical method --- digital image correlation --- finite element method --- static analysis --- arch structures --- fracture process zone --- digital image correlation technique --- acoustic emission technique --- stress intensity factor --- 3D deformation --- digital volume correlation --- optical coherence elastography --- virtual fields method --- layered material --- interior 3D deformation --- digital volumetric speckle photography --- X-ray microtomography --- digital volume correlation --- red sandstone --- woven composite beam --- digital image correlation --- dynamic interfacial rupture --- traction continuity across interfaces --- non-contact video gauge --- measurement --- stress-strain relationship --- uniaxial tensile test --- elevated temperature --- DIC --- initial condition --- image registration --- strain measurement --- copper plate --- underwater impulsive loading --- non-liner dynamic deformation --- 3D digital image correlation --- image correlation --- gradient correlation functions --- laser speckles --- image cross-correlation --- monitoring --- geosciences --- automated systems --- machine learning --- image classification --- image shadowing --- characterization of composite materials --- interlaminar tensile strength --- digital image correlation --- inverse method --- finite element model updating --- Digital image correlation (DIC) --- composite structures --- structural testing --- experimental mechanics --- composite materials --- automated composite manufacturing --- composite inspection --- automated fiber placement (AFP) --- DIC --- traceable calibration --- accuracy --- error --- n/a

Carbon Fibers and Their Composite Materials

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ISBN: 9783039211029 9783039211036 Year: Pages: 186 DOI: 10.3390/books978-3-03921-103-6 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General)
Added to DOAB on : 2019-08-28 11:21:27
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Carbon fiber is an oft-referenced material that serves as a means to remove mass from large transport infrastructure. Carbon fiber composites, typically plastics reinforced with the carbon fibers, are key materials in the 21st century and have already had a significant impact on reducing CO2 emissions. Though, as with any composite material, the interface where each component meets, in this case the fiber and plastic, is critical to the overall performance.

New Developments in Statistical Information Theory Based on Entropy and Divergence Measures

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ISBN: 9783038979364 9783038979371 Year: Pages: 344 DOI: 10.3390/books978-3-03897-937-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Social Sciences --- Sociology --- Statistics
Added to DOAB on : 2019-06-26 08:44:06
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This book presents new and original research in Statistical Information Theory, based on minimum divergence estimators and test statistics, from a theoretical and applied point of view, for different statistical problems with special emphasis on efficiency and robustness. Divergence statistics, based on maximum likelihood estimators, as well as Wald’s statistics, likelihood ratio statistics and Rao’s score statistics, share several optimum asymptotic properties, but are highly non-robust in cases of model misspecification under the presence of outlying observations. It is well-known that a small deviation from the underlying assumptions on the model can have drastic effect on the performance of these classical tests. Specifically, this book presents a robust version of the classical Wald statistical test, for testing simple and composite null hypotheses for general parametric models, based on minimum divergence estimators.

Keywords

sparse --- robust --- divergence --- MM algorithm --- Bregman divergence --- generalized linear model --- local-polynomial regression --- model check --- nonparametric test --- quasi-likelihood --- semiparametric model --- Wald statistic --- composite likelihood --- maximum composite likelihood estimator --- Wald test statistic --- composite minimum density power divergence estimator --- Wald-type test statistics --- Bregman divergence --- general linear model --- hypothesis testing --- influence function --- robust --- Wald-type test --- log-linear models --- ordinal classification variables --- association models --- correlation models --- minimum penalized ?-divergence estimator --- consistency --- asymptotic normality --- goodness-of-fit --- bootstrap distribution estimator --- thematic quality assessment --- relative entropy --- logarithmic super divergence --- robustness --- minimum divergence inference --- generalized renyi entropy --- minimum divergence methods --- robustness --- single index model --- model assessment --- statistical distance --- non-quadratic distance --- total variation --- mixture index of fit --- Kullback-Leibler distance --- divergence measure --- ?-divergence --- relative error estimation --- robust estimation --- information geometry --- centroid --- Bregman information --- Hölder divergence --- indoor localization --- robustness --- efficiency --- Bayesian nonparametric --- Bayesian semi-parametric --- asymptotic property --- minimum disparity methods --- Hellinger distance --- Berstein von Mises theorem --- measurement errors --- robust testing --- two-sample test --- misspecified hypothesis and alternative --- 2-alternating capacities --- composite hypotheses --- corrupted data --- least-favorable hypotheses --- Neyman Pearson test --- divergence based testing --- Chernoff Stein lemma --- compressed data --- Hellinger distance --- representation formula --- iterated limits --- influence function --- consistency --- asymptotic normality --- location-scale family --- n/a

Natural Fiber-Reinforced Hybrid Composites

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ISBN: 9783039281541 9783039281558 Year: Pages: 104 DOI: 10.3390/books978-3-03928-155-8 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General)
Added to DOAB on : 2020-04-07 23:07:09
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In the last few decades, natural fibers have received growing attention as an alternative to the synthetic fibers used in the reinforcement of polymeric composites, thanks to their specific properties, low price, health advantages, renewability, and recyclability. Furthermore, natural fibers have a CO2-neutral life cycle, in contrast to their synthetic counterparts. As is widely known, natural fibers also possess some drawbacks, e.g., a hydrophilic nature, low and variable mechanical properties, poor adhesion to polymeric matrices, high susceptibility to moisture absorption, low aging resistance, etc. This implies that their applications are limited to non-structural interior products. To overcome this problem, the hybridization of natural fibers with synthetic ones (i.e., glass, carbon, and basalt) or different natural fibers can be a solution. For this reason, extensive research concerning natural–synthetic and natural–natural hybrid composites has been done in the last years. In this context, this book aims to collect some interesting papers concerning the use of natural fibers together with synthetic ones with the aim of obtaining hybrid structures with good compromise between high properties (e.g., mechanical performances, thermal behavior, aging tolerance in humid or aggressive environments, and so on) and environment care.

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