Papers by Keyword: Sheet

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Authors: F. Kaiser, Dietmar Letzig, Jan Bohlen, A. Styczynski, Ch. Hartig, Karl Ulrich Kainer
Authors: Satoshi Takaoka, Hiroshi Horikawa, Jyunji Kobayashi, Kenichi Shimizu
Authors: Janina Adamus
Abstract: Titanium is most likely to play more important role in future civil applications. Its excellent properties such as: low density, high mechanical strength and good corrosion resistance give it some advantages and open the way for new applications both in modern technology and civil engineering. In many ways (e.g. specific strength, corrosion resistance) titanium, especially its alloys outstrip typical structural materials such as steel and aluminium alloys. The article discusses properties of titanium and its alloys, which are especially important in civil engineering applications due to their properties: low density, resistance to sea water and salty atmospheres of seashores, low coefficient of thermal expansion and excellent aesthetic qualities. Although the use of titanium in civil application is still limited it is expected that a demand for titanium building materials will steadily grow in the future. The characteristic titanium applications in the worldwide civil engineering are presented. It is highlighted that despite high cost of titanium relative to other materials, over a long span of 20 or more years titanium tends to be cheaper in terms of life-cycle costs. Furthermore, the article investigates the difficulties and opportunities associated with shaping titanium sheets. In the paper, some technological problems (e.g. low drawability, high susceptibility to galling and high spring-back) occurring in the sheet-titanium forming processes are discussed.
Authors: David Bryan
Abstract: ATI 425® Alloy, nominal composition Ti-4.0Al-2.5V-1.5Fe-0.25O, is a new alpha/beta Ti alloy of significant commercial interest as a viable replacement for Ti-6Al-4V, CP-Ti, and other titanium alloys in a variety of aerospace applications. ATI 425® Alloy offers properties comparable to Ti-6Al-4V alloy with significant improvements in formability, both at room and elevated temperatures. The reasons for the improved formability, particularly at low temperatures, are not well understood. The development of a thorough understanding is complicated by the wide array of phases, microstructures, and deformation paths available via thermomechanical processing in alpha/beta titanium alloys. In this paper, theories of strengthening and dislocation mobility in titanium and HCP metals will be reviewed and applied to better understand why ATI 425® Alloy offers a unique combination of strength and formability not obtainable by conventional alpha/beta titanium alloys. Subsequently, the application of the improved formability to a range of product forms including sheet, tubing, and forgings will be discussed.
Authors: Ionel Olaru
Abstract: Present heat exchangers should ensure very good heat transfer while having as small size, high durability and the optimum performance at low prices. Thus to achieve these goals is used as base material, aluminum in various forms, of which can be made the heat exchangers energetic efficient. Realization of aluminum heat exchangers can be properly with present requirements using the brazing joint elements. Brazing achieved joining with temperature for two base materials using a filler metal with a melting point above 450°C. A properly brazed joint is performed with a metallurgical connection between two or more metals, which is generally as strong as or stronger than the base metal used.
Authors: Jian Hua Zhong, Hong Bin Zhu, Kai Feng, Yin Ping Xiao
Abstract: The experiment has studied the mechanical properties effect of rare earth(RE)-7075 Al alloy's hot rolled sheet and cold rolled sheet coursing by two-step aging treatment. The hot rolled sheet and cold rolled sheet were analyzed by EDS(energy dispersive spectrometer), SEM(scanning electron microscope) and tested by Brinell Hardness tester, Computer-controlled electronic universal testing. The results shows that the synthetical mechanical properties of hot rolled sheet exceeds cold rolled sheet. The tensile strength is higher approximately 80MPa, elongation is larger approximately 3% and Brill hardness is bigger approximately 30HB after the two-step aging treatment.
Authors: Laurence Giraud-Moreau, Abel Cherouat, Houman Borouchaki
Abstract: As soon as it is question of modelling the follow-up of a geometry during an operation of forming process, the difficulties of meshing and remeshing are often emphases. If the part is situated between rigid tools (case of the deep drawing), in the problems of remeshing are also added difficulties on the management of the contact between the parts. In this case, the deformations are caused by the contact with the tools whose geometry are fixed. The piece must take the shape of the tool geometries during the deformation. In this paper, we present a method coupling an adaptive remeshing strategy and a technique of projection on the tool. The remeshing is based on refinement and coarsening procedures. The projection of the new nodes on the tool allows keeping the contact between the part and the tools. Numerical examples show the efficiency of the method.
Authors: Nobuhiro Kato, Yuki Ido, Ei Yamamoto, Shigeki Hontsu
Abstract: In cosmetic dentistry, bleaching and laminate veneer methods are common treatments to improve the appearance of teeth. However, there are limitations to these treatments, as they damage the enamel which are not capable of recovering naturally. In this study, novel hydroxyapatite (HAp) sheets, which enable both enamel restoration and aesthetic treatments, were developed. Results indicated that the lower range of the sintering temperatures, of the pulsed laser deposition targets, produced lighter shades of amorphous Calcium phosphate (ACP) sheets. Subsequently, the post-annealing process of the sheets induced crystallization processes of the ACP sheets, to form HAp sheets, and improved the shade rank of the sheet. The shade rank of the developed sheet (6.8 ± 0.2) was almost comparable to the average shade rank of the teeth of Japanese people, within a range of 6.5 to 7.0.
Authors: Ionel Olaru
Abstract: In this paper we propose to analyze drawing of bimetallic sheets joined by brazing. Drawing is the transformation of a plan workpiece to the drawn part or workpiece transformation with decreasing of depth corresponding transverse dimensions. The brazing process is based on the difference in the melting points of the base materials and filler metal. During the brazing process, the bimetallic sheets to be assembled are heated for at a temperature between the melting temperatures of the two alloys, this process tends to modify the geometry and the microstructure of the brazed sheets.
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