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| 2. |
- Lindgren, Michael, et al.
(författare)
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Roll Forming
- 2015
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Ingår i: Handbook of Manufacturing Engineering and Technology. - London : Encyclopedia of Global Archaeology/Springer Verlag. - 9781447146698 - 9781447146704 ; , s. 285-307
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Bokkapitel (refereegranskat)abstract
- Roll forming is cost-effective compared to other sheet metal forming processes for uniform profiles. The process has during the last 10 years developed into forming of profiles with varying cross sections and is thereby becoming more flexible. The motion of the rolls can now be controlled with respect to many axes enabling a large variation in the profiles along the formed sheet, the so-called 3D roll forming or flexible roll forming technology. The roll forming process has also advantages compared to conventional forming for high-strength materials. Furthermore, computer tools supporting the design of the process have also been developed during the last 10 years. This is quite important when designing the forming of complex profiles. The chapter describes the roll forming process, particularly from the designer’s perspective. It gives the basic understanding of the process and how it is designed. Furthermore, modern computer design and simulation tools are discussed
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| 3. |
- Pettersen, Ketil, et al.
(författare)
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Creep Resistant Mg Alloy Development
- 2000
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Ingår i: Magnesium Alloys and their Applications. - Weinheim : John Wiley & Sons. - 9783527302826
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Kessler, Vadim
(författare)
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The Synthesis and Solution Stability of Alkoxide Precursors
- 2016
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Ingår i: Handbook of Sol-Gel Science and Technology. - Cham : Springer International Publishing. - 9783319194547 ; , s. 1-50
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Bokkapitel (refereegranskat)abstract
- The aim of this chapter is to serve as a guide in understanding the principles in thechemical approaches to and stability of the metal and silicon alkoxide precursors.The major accent is made on the overview of the accessible precursor compoundsapplicable in solgel technology, focusing on their synthesis and reactivity includingthe chemistry behind the solgel process. The chapter provides an insight intothe synthesis of homometallic precursors (see section “Synthesis ofHomometallic Precursors”), synthesis of heterometallic precursors (see section“Synthesis of Heterometallic Alkoxide Precursors”), solution stability withrespect to formation of oxoalkoxides (see section “Solution Stability with Respectto Formation of Oxoalkoxides”), solution stability with respect to solvolysis (seesection “Solution Stability with Respect to Solvolysis”), and, finally, a shortreview summarizing the literature data on individual alkoxide complexes appliedas precursors (see section “Individual Alkoxide Complexes Applied as Precursors”)considering separately the homometallic species (see section“Homometallic Precursors”) and the heterometallic ones – so-called singlesourceprecursors (see section “Heterometallic Precursors”). Finally, a briefoverview of the modern concepts treating the transformation of precursors intomaterials is also provided (see section “The Chemistry of Alkoxide Precursors’Transformation into Oxide Materials in Sol-Gel Technology”).
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| 5. |
- Sanchez Heres, Luis Felipe, 1984, et al.
(författare)
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Effective use of composite marine structures: reducing weight and acquisition cost
- 2018
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Ingår i: Marine Composites - Design and Performance. - 9780081022641 ; , s. 161-184
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Composite structures are a way to reduce the operational costs of a vessel or to increase its potential revenue. However, depending on the design of the vessel, its operational profile, and the business model of the owner, the benefits brought by a composite structure may not justify its acquisition cost. This paper presents a number of investigations aimed at reducing the acquisition cost of marine composite structures and maximizing their benefits through a more effective use of composite materials (in other words, weight reduction of the composite structure). The investigations cover three areas of opportunity for doing so: material safety factors, material characterization, and numerical optimization of large composite structures. The following conclusions are drawn from the investigations: motivating a reduction of material safety factors through probabilistic analyses is unpractical at best, and questionable at worst; improving the material characterization of textile composites is easy, relatively costless, and can modestly reduce structural weight through better material property values; numerical optimization of large composite structures is cumbersome, but feasible, and holds the greatest potential increasing the economical attractiveness of composite marine structures.
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| 6. |
- Jiao, Wenna, et al.
(författare)
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Eutectic High-Entropy Alloys
- 2022
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Ingår i: Materials Horizons: From Nature to Nanomaterials. - Singapore : Springer Nature Singapore. - 2524-5392 .- 2524-5384. ; , s. 53-90
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Eutectic high-entropy alloys (EHEAs), as a subclass of high-entropy alloys (HEAs), exhibit various excellent mechanical, physical, and anti-corrosion properties as well as excellent castability, which are becoming one of the research frontiers in the metal alloy field. EHEAs combine nicely the unique advantages of eutectic alloys and HEAs, with in-situ formed composite structure containing multi-principal components during the solidification process. Since the first report of EHEAs in 2014, plenty of investigations have been made on the topic, resulting in dozens of promising candidate EHEAs for future applications. In this chapter, the recent research advances in EHEAs were summarized, to comprehensively present the historical development, current situation, and future aspects of EHEAs. The concept of EHEAs was firstly introduced, which was proposed based on the special solidification microstructure of eutectic alloys. The excellent mechanical performance in directly cast EHEAs inspired rapid developments on this topic. Then, several alloy design methods were introduced, for the efficient prediction of new EHEA systems. Meanwhile, the deformation behavior and mechanisms have been thoroughly investigated for a mechanistic understanding of the superior mechanical properties of EHEAs, and they were summarized here. Finally, the potential applications and future developments of EHEAs were suggested as a concluding remark.
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| 7. |
- Johansson, Kenth S.
(författare)
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20 - Surface Modification of Plastics
- 2017
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Ingår i: Applied Plastics Engineering Handbook (Second Edition). - : Elsevier. - 9780323390408 ; , s. 443-487
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Abstract This chapter gives an overview of different methods for improving surface properties of plastics. Plastics are inherently hydrophobic, low surface energy materials and thus do not adhere well to other materials. Adhesion improvement is the most common application but other surface characteristics, such as wettability, water- and chemical resistance, nonfouling, tribological behavior, oxygen, and moisture transmission are also addressed. It has been estimated that 70% of the total production of plastic materials must be surface treated prior to processing. The methods range from vacuum to atmospheric pressure, wet to dry, simple to sophisticated, and inexpensive to very costly to obtain the required functional characteristics of plastics. Most methods used today are dry and environmentally sound. The methods presented are roughly divided in surface activation (e.g., plasma, corona, flame, and UV laser) and surface coating (e.g., plasma polymerization, chemical vapor deposition, Parylene, physical vapor deposition) techniques.
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| 8. |
- Sarmad, Shokat, et al.
(författare)
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Vapor-liquid equilibrium of ionic liquids
- 2020
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Ingår i: Encyclopedia of ionic liquids. - Singapore : Springer. - 9789811067396 - 9789813342200 ; , s. 1-22
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 9. |
- Wegener, Gerd, et al.
(författare)
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Herausforderungen für die Forst- und Holzwirtschaft und das nachhaltige Bauen und Sanieren
- 2008
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Ingår i: Zukunftsmärkte für das Bauen mit Holz, Kristof, K., Geibler, J. von, DRW-Verlag Weinbrenner, Leinefelden-Echterdingen, Deutschland. - 9783871817113 ; , s. 11-13
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Ghassemali, Ehsan, 1983-
(författare)
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Forging of Metallic Parts and Structures
- 2022
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Ingår i: Encyclopedia of Materials. - Oxford : Elsevier. - 9780128197332 ; , s. 129-143
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Even with the wide applications of many new and modern manufacturing technologies, metal forming processes are still in great demand in many industrial sectors, ranging from transportation to medical applications. In this article, the basic knowledge in metal forming and specifically forging, which is one of the most commonly used processes for metal component manufacturing, is summarized. The effect of material behavior on the forming processes is discussed in detail. The classical modeling techniques to describe the forming processes are briefly introduced, with a focus on the challenges in this area. Different categories of forging process such as open-die, closed-die or cold, warm and hot forging are explained. Advantages of forging processes such as near-net-shape characteristics, microstructural refinement during the process, and relative ease of post-processing for forged parts are elaborated. Main disadvantages of forging include possible oxidation during hot forging, limitation on material selection for forging (workability), and the related maintenance cost of the forging tools. Examples of parts and structures that can be produced by forging process are metallic tools for various applications ranging from household to aerospace sectors, where close tolerance and proper mechanical properties are expected.
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