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Material and Process Design for Lightweight Structures

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ISBN: 9783038979586 9783038979593 Year: Pages: 162 DOI: 10.3390/books978-3-03897-959-3 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Materials
Added to DOAB on : 2019-06-26 08:44:06
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The use of lightweight structures across several industries has become inevitable in today’s world given the ever-rising demand for improved fuel economy and resource efficiency. In the automotive industry, composites, reinforced plastics, and lightweight materials, such as aluminum and magnesium are being adopted by many OEMs at increasing rates to reduce vehicle mass and develop efficient new lightweight designs. Automotive weight reduction with high-strength steel is also witnessing major ongoing efforts to design novel damage-controlled forming processes for a new generation of efficient, lightweight steel components. Although great progress has been made over the past decades in understanding the thermomechanical behavior of these materials, their extensive use as lightweight solutions is still limited due to numerous challenges that play a key role in cost competitiveness. Hence, significant research efforts are still required to fully understand the anisotropic material behavior, failure mechanisms, and, most importantly, the interplay between industrial processing, microstructure development, and the resulting properties. This Special Issue reprint book features concise reports on the current status in the field. The topics discussed herein include areas of manufacturing and processing technologies of materials for lightweight applications, innovative microstructure and process design concepts, and advanced characterization techniques combined with modeling of material’s behavior.

Polymer Clay Nano-composites

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ISBN: 9783039216529 9783039216536 Year: Pages: 246 DOI: 10.3390/books978-3-03921-653-6 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Biology
Added to DOAB on : 2019-12-09 11:49:16
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This Special Issue focuses on the current state-of-the-art of “Polymer Clay Nano-Composites” for biomedical, anticorrosion, antibacterial, and other applications. Clay–polymer composite nanomaterials represent an emerging area of research. Loading polymers with clay particles essentially enhances the composite strength features. Of particular interest are different nano-assembly methods, such as silane mono and multilayers, polyelectrolyte layer-by-layer assembly, and others. An important development was reached for tubular and fibrous clay nanoparticles, such as halloysite, sepiolite, and imogolite. Polymer clay nanoparticles can be prepared as sheets with 1-nm thickness and width of a few hundred nm (e.g., kaolin and montmorillonite). Fibrous clays significantly reinforce the nano-composites in the assembly with biopolymers and other green polymers, leading to functional hybrid bio nano-composites. The scope of this Special Issue comprehensively includes the synthesis and characterization of polymer clay nano-composites used for several applications, including nano-clay polymer composites and hybrid nano-assemblies.

Keywords

polyimide --- graphene oxide --- composite --- mechanical properties --- indentation recovery --- AFM --- carbon fibers --- surface grafting --- halloysite nanotubes --- polymer composites --- interface --- fish gelatin --- halloysite nanotubes --- glycerol --- mechanical properties --- water resistance --- LAP --- hyaluronic acid --- doxorubicin --- CD44 receptor targeted --- sacrificial bond --- ionic network --- organic montmorillonite --- 1,2-polybutadiene --- in-situ intercalation --- clay–polymer nanocomposites --- atrazine --- radical polymerization --- hexadecyltrimethylammonium bromide --- phenyltrimethylammonium chloride --- FTIR --- TGA --- adsorption --- dental resins --- nanocomposite materials --- organically modified clays --- montmorillonite --- intercalation --- nanotechnology --- ammonium persulfate --- fuzzy optimization --- N,N?-methylenebisacrylamide --- Pareto set --- polyacrylic acid --- swelling capacity --- variable cost --- polyethylene oxide --- montmorillonite clays --- Pd catalysis --- catalytic composite --- positron annihilation --- doubly functionalized montmorillonite --- polystyrene --- soap-free emulsion polymerization --- thermal stability --- tribological property --- organo-clays --- polyamines --- clay-amine interaction mechanisms --- structure effects --- la uptake and release --- layered silicate --- sericite --- CTAB --- intercalation stability --- nanocomposites --- gelation kinetics --- sol–gel transition --- water shutoff --- silica sol --- cellulose nanofibrils --- halloysite nanotubes --- supercritical CO2 --- polystyrene foam --- blowing agent --- in situ polymerization --- attapulgite/polypyrrole nanocomposite --- halloysite nanotubes --- polysaccharide --- interfacial interactions --- reinforcing --- adsorption --- dispersion --- coatings --- whey protein isolate --- nanocomposites --- nanoclay, barrier --- morphology --- n/a

Dissimilar Metal Welding

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ISBN: 9783039219544 9783039219551 Year: Pages: 288 DOI: 10.3390/books978-3-03921-955-1 Language: English
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

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