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Biaxial Characterization and Mean-field Based Damage Modeling of Sheet Molding Compound Composites

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Book Series: Schriftenreihe Kontinuumsmechanik im Maschinenbau / Karlsruher Institut für Technologie, Institut für Technische Mechanik - Bereich Kontinuumsmechanik ISSN: 2192693X ISBN: 9783731508182 Year: Volume: 13 Pages: IX, 168 p. DOI: 10.5445/KSP/1000084270 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-28 18:37:01
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The focus of this work lies on the microstructure-based modeling and characterization of a discontinuous fiber-reinforced thermoset in the form of sheet molding compound (SMC). A microstructure-based parameter identification scheme for SMC with an inhomogeneous fiber orientation distribution is introduced. Different cruciform specimen designs, including two concepts to reinforce the specimens' arms are evaluated. Additionally, a micromechanical mean-field damage model for the SMC is introduced.

Microstructure and Mechanical Behavior of Deep Drawing DC04 Steel at Different Length Scales

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ISBN: 9783866449671 Year: Pages: XIII, 162 p. DOI: 10.5445/KSP/1000032165 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
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The deformation behavior of steels is strongly influenced by their microstructure which is a result of the alloying elements and thermal treatments. In this work, the microstructure and the deformation behavior of a non-alloyed deep drawing DC04 steel was investigated. The microstructure was analyzed during heat treatment by EBSD, then microcompression experiments were performed on selected microstructural units and then bulk steel samples were mechanically tested by tensile experiments.

Computergestützte Verfahren zur pragmatischen Beurteilung der Tragwiderstände von Brettschichtholz: Zusammenfassung exemplarischer Simulationsstudien

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Book Series: Karlsruher Berichte zum Ingenieurholzbau / Karlsruher Institut für Technologie, Holzbau und Baukonstruktionen ISSN: 1860093X ISBN: 9783731504931 Year: Volume: 31 Pages: 174 p. DOI: 10.5445/KSP/1000052710 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
Added to DOAB on : 2019-07-30 20:02:00
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This book contains experiences and results of computer simulations in the field of research on glued laminated timber. Literature and references to the corresponding methodical approach are given to facilitate the access to the elementary basics. It also contains constructive explanations and critical annotations on modelling glued laminated timber for bending, tension and compression tests. Finally, the relevance of the simulation results for practical issues is discussed.

Plastische Verformungsmechanismen in hochgradig kaltgewalzten, ultrafeinkörnigen Wolframblechen

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783731508786 Year: Volume: 78 Pages: XIX, 224 p. DOI: 10.5445/KSP/1000088290 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
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Cold rolled tungsten sheets are regarded as promising materials for high-temperature applications. The correlation of microstructural features with strain rate sensitive, mechanical properties of differently thick cold rolled tungsten sheets allows conclusions to be drawn on the plastic deformation mechanisms. Thus, the simultaneous increase in strength and ductility of the technically pure tungsten sheets at room temperature as well as their high-temperature behavior can be explained.

Thermo-Mechanical Behaviour of Structural Lightweight Alloys

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ISBN: 9783039213870 / 9783039213887 Year: Pages: 128 DOI: 10.3390/books978-3-03921-388-7 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General)
Added to DOAB on : 2019-12-09 16:10:12
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The need to reduce the ecological footprint of water/land/air vehicles in this era of climate change requires pushing the limits regarding the development of lightweight structures and materials. This requires a thorough understanding of their thermomechanical behavior at several stages of the production chain. Moreover, during service, the response of lightweight alloys under the simultaneous influence of mechanical loads and temperature can determine the lifetime and performance of a multitude of structural components. The present Special Issue, comprising eight original research articles, is dedicated to disseminating current efforts around the globe aimed at advancing understanding of the thermomechanical behavior of structural lightweight alloys under processing or service conditions.

Processing-Structure-Property Relationships in Metals

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ISBN: 9783039217700 / 9783039217717 Year: Pages: 240 DOI: 10.3390/books978-3-03921-771-7 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 16:39:37
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In the industrial manufacturing of metals, the achievement of products featuring desired characteristics always requires the control of process parameters in order to obtain a suitable microstructure. The strict relationship among process parameters, microstructure, and mechanical properties is a matter of interest in different areas, such as foundry, plastic forming, sintering, welding, etc., and regards both well-established and innovative processes. Nowadays, circular economy and sustainable technological development are dominant paradigms and impose an optimized use of resources, a lower energetic impact of industrial processes and new tasks for materials and products. In this frame, this Special Issue covers a broad range of research works and contains research and review papers.

Keywords

titanium composites --- in situ secondary phases --- microstructure --- inductive hot pressing --- intermetallic --- bainite rail --- tempering --- retained austenite --- tensile property --- impact toughness --- cryorolling --- reduction --- ultrafine grain --- secondary recrystallization --- high strength --- microstructure inhomogeneity --- non-monotonic simple shear strains --- shear strain reversal --- severe plastic deformation --- texture inhomogeneity --- tensile properties --- Mg-10Y-6Gd-1.5Zn-0.5Zr --- ultra-fine grain --- aging treatment --- precipitation behavior --- mechanical property --- multimodal --- AZ91 alloy --- equal channel angular pressing --- aging --- high pressure die casting --- aluminum alloy --- prediction model --- process monitoring --- static mechanical behavior --- fracture surface --- microstructure. --- casting --- Al 6061 alloys --- shrinkage --- porosity --- steering knuckles --- Al alloys --- warm working --- mechanical properties --- dental materials --- metal posts --- computer-aided design (CAD) --- image analysis --- mechanical properties --- finite element analysis --- additive manufacturing --- Al alloys --- wear --- cavitation erosion --- SEM --- microstructure --- high speed steel --- nanostructured coatings --- thin films --- FEGSEM --- tribology --- Nb tube --- caliber-rolling --- grain boundaries --- texture --- electron backscatter diffraction --- damping --- aluminum film --- grain boundary --- anelasticity --- thin aluminum sheet --- alloys --- aeronautic applications --- mechanical properties --- corrosion resistance --- EBM --- SEBM --- macro-instrumented indentation test --- property-microstructure-process relationship --- mechanical properties --- indentation hardness --- indentation modulus --- tensile properties --- Ti-6Al-4V alloy --- ?-platelet thickness --- columnar microstructure --- n/a

Dissimilar Metal Welding

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ISBN: 9783039219544 / 9783039219551 Year: Pages: 288 DOI: 10.3390/books978-3-03921-955-1 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-01-07 09:08:26
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The combination of distinct materials is a key issue in modern industry, whereas the driving concept is to design parts with the right material in the right place. In this framework, a great deal of attention is directed towards dissimilar welding and joining technologies. In the automotive sector, for instance, the concept of “tailored blanks”, introduced in the last decade, has further highlighted the necessity to weld dissimilar materials. As far as the aeronautic field is concerned, most structures are built combining very different materials and alloys, in order to match lightweight and structural performance requirements. In this framework, the application of fusion welding techniques, namely, tungsten inert gas or laser welding, is quite challenging due to the difference in physical properties, in particular the melting point, between adjoining materials. On the other hand, solid-state welding methods, such as the friction stir welding as well as linear friction welding processes, have already proved to be capable of manufacturing sound Al-Cu, Al-Ti, Al-SS, and Al-Mg joints, to cite but a few. Recently, promising results have also been obtained using hybrid methods. Considering the novelty of the topic, many relevant issues are still open, and many research groups are continuously publishing valuable results. The aim of this book is to finalize the latest contributions on this topic.

Keywords

dissimilar joints --- friction stir welding --- microstructure --- mechanical properties --- local strength mismatch --- dissimilar metal welded joint --- fracture resistance --- crack growth path --- optimal design --- laser beam welding --- spatial beam oscillation --- dissimilar metals --- aluminum --- copper --- friction stir welding --- aluminum --- copper --- cross-section adjustment --- mechanical properties --- electrical properties --- dissimilar weld --- ageing --- tensile properties --- hardness --- failure mode --- dissimilar metal welding --- Inconel 625 --- AISI 316L --- microstructure --- filler metals --- friction stir spot welding --- friction stir spot brazing --- joining area --- fracture load --- Al/steel dissimilar materials --- friction stir welding --- interface --- intermetallic compounds --- dual-beam laser welding --- steel/Al joint --- side-by-side configuration --- tensile resistance --- EBSD phase mapping --- pulsed Nd:YAG laser beam welding --- interfacial crack initiation --- dissimilar Ti6Al4V/AA6060 lap joint --- phase potential --- laser welding --- pulsed Nd:YAG laser --- DP1000 steel --- 1050 aluminum alloy --- dissimilar materials welding --- steel/aluminum joint --- Ag-Cu-Zn --- Rare earth --- aging treatment --- microstructure --- mechanical properties --- aluminum --- dissimilar --- friction stir welding --- FSW --- hardness --- microstructure --- tensile --- magnetic pulse welding --- dissimilar metal welding --- solid state welding --- welding window --- cloud of particles --- jet --- surface activation --- welding-brazing --- arc assisted laser method --- aluminum-steel butt joint --- mechanical properties --- DeltaSpot welding --- spooling process tape --- aluminum alloy --- dissimilar metal welding --- lobe curve --- electromagnetic pulse welding --- tubular joints --- internal supports --- n/a

Food Packaging. Materials and Technologies

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ISBN: 9783038977667 9783038977674 Year: Pages: 216 DOI: 10.3390/books978-3-03897-767-4 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Materials
Added to DOAB on : 2019-04-25 16:37:17
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Because of the increasing pressure on both food safety and packaging/food waste, the topic is important both for academics, applied research, industry and also for environment protection. Different materials, such as glass, metals, paper and paperboards, and non-degradable and degradable polymers, with versatile properties, are attractive for potential uses in food packaging. Food packaging is the largest area of application within the food sector. Only the nanotechnology-enabled products in the food sector account for ~50% of the market value, with and the annual growth rate is 11.65%. Technological developments are also of great interest. In the food sector, nanotechnology is involved in packaging materials with extremely high gas barriers, antimicrobial properties, and also in nanoencapsulants for the delivery of nutrients, flavors, or aromas, antimicrobial, and antioxidant compounds. Applications of materials, including nanomaterials in packaging and food safety, are in forms of: edible films, polymer nanocomposites, as high barrier packaging materials, nanocoatings, surface biocides, silver nanoparticles as potent antimicrobial agents, nutrition and neutraceuticals, active/bioactive packaging, intelligent packaging, nanosensors and nanomaterial-based assays for the detection of food relevant analytes (gasses, small organic molecules and food-borne pathogens) and bioplastics.

Synthesis and Applications of Biopolymer Composites

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ISBN: 9783039211326 / 9783039211333 Year: Pages: 312 DOI: 10.3390/books978-3-03921-133-3 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Engineering
Added to DOAB on : 2019-08-28 11:21:27
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This book, as a collection of 17 research articles, provides a selection of the most recent advances in the synthesis, characterization, and applications of environmentally friendly and biodegradable biopolymer composites and nanocomposites. Recently, the demand has been growing for a clean and pollution-free environment and an evident target regarding the minimization of fossil fuel usage. Therefore, much attention has been focused on research to replace petroleum-based commodity plastics by biodegradable materials arising from biological and renewable resources. Biopolymers—polymers produced from natural sources either chemically from a biological material or biosynthesized by living organisms—are suitable alternatives for addressing these issues due to their outstanding properties, including good barrier performance, biodegradation ability, and low weight. However, they generally possess poor mechanical properties, a short fatigue life, low chemical resistance, poor long-term durability, and limited processing capability. In order to overcome these deficiencies, biopolymers can be reinforced with fillers or nanofillers (with at least one of their dimensions in the nanometer range). Bionanocomposites are advantageous for a wide range of applications, such as in medicine, pharmaceutics, cosmetics, food packaging, agriculture, forestry, electronics, transport, construction, and many more.

Keywords

nanocellulose --- protease sensor --- human neutrophil elastase --- peptide-cellulose conformation --- aerogel --- glycol chitosan --- ?-tocopherol succinate --- amphiphilic polymer --- micelles --- paclitaxel --- chitosan --- PVA --- nanofibers --- electrospinning --- nanocellulose --- carbon nanotubes --- nanocomposite --- conductivity --- surfactant --- Poly(propylene carbonate) --- thermoplastic polyurethane --- compatibility --- toughness --- biopolyester --- compatibilizer --- cellulose --- elastomer --- toughening --- biodisintegration --- heat deflection temperature --- biopolymers composites --- MgO whiskers --- PLLA --- in vitro degradation --- natural rubber --- plasticized starch --- polyfunctional monomers --- physical and mechanical properties --- cross-link density --- water uptake --- chitosan --- deoxycholic acid --- folic acid --- amphiphilic polymer --- micelles --- paclitaxel --- silk fibroin --- glass transition --- DMA --- FTIR --- stress-strain --- active packaging materials --- alginate films --- antimicrobial agents --- antioxidant activity --- biodegradable films --- essential oils --- polycarbonate --- thermal decomposition kinetics --- TG/FTIR --- Py-GC/MS --- wheat gluten --- potato protein --- chemical pre-treatment --- structural profile --- tensile properties --- biocomposites --- natural fibers --- poly(3-hydroxybutyrate-3-hydroxyvalerate) --- biodegradation --- impact properties --- chitin nanofibrils --- poly(lactic acid) --- nanocomposites --- bio-based polymers --- natural fibers --- biomass --- biocomposites --- fiber/matrix adhesion --- bio-composites --- mechanical properties --- poly(lactic acid) --- cellulose fibers --- n/a

Innovative Technologies and Services for Smart Cities

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ISBN: 9783039211814 / 9783039211821 Year: Pages: 214 DOI: 10.3390/books978-3-03921-182-1 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Electrical and Nuclear Engineering
Added to DOAB on : 2019-12-09 11:49:15
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A smart city is a modern technology-driven urban area which uses sensing devices, information, and communication technology connected to the internet of things (IoTs) for the optimum and efficient utilization of infrastructures and services with the goal of improving the living conditions of citizens. Increasing populations, lower budgets, limited resources, and compatibility of the upgraded technologies are some of the few problems affecting the implementation of smart cities. Hence, there is continuous advancement regarding technologies for the implementation of smart cities. The aim of this Special Issue is to report on the design and development of integrated/smart sensors, a universal interfacing platform, along with the IoT framework, extending it to next-generation communication networks for monitoring parameters of interest with the goal of achieving smart cities. The proposed universal interfacing platform with the IoT framework will solve many challenging issues and significantly boost the growth of IoT-related applications, not just in the environmental monitoring domain but in the other key areas, such as smart home, assistive technology for the elderly care, smart city with smart waste management, smart E-metering, smart water supply, intelligent traffic control, smart grid, remote healthcare applications, etc., signifying benefits for all countries.

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