Papers by Keyword: Joining

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Authors: Zheng Yi Fu, D.H. He, Jing Ying Zhang, Wei Min Wang, Hang Wang, Qing Jie Zhang
Abstract: In this paper, we suggest PCH as a method of joining alloys. The temperature distribution in the samples during the joining process was analyzied. From the temperature distribution profiles in PCH joining, it is concluded that PCH for the joining has two advantages: (1) There is a temperature distribution peak along the sample. The contacting surfaces which need high temperature happen to obtain the highest temperature; (2) The parts to be joined at relatively lower temperatures can avoid the damage of heat attack. The optimal joining conditions were discussed. The PCH and HP techniques were compared for the joining of alloys. It was found that the high tensile strength joined structure of alloys can be fabricated by PCH method at lower joining temperature, shorter holding time, and lower pressure, compared with that by HP method. The PCH process was considered to be an eco-friendly process compared with the traditional heat diffusion joining methods.
886
Authors: Raoul Plettke, Adam Schaub, Christian Gröschel, Chritian Scheitler, Martina Vetter, Oliver Hentschel, Florian Ranft, Marion Merklein, Michael Schmidt, Dietmar Drummer
Abstract: Mixed-Materials parts have great light-weight potential for the automotive application to reduce the carbon footprint. But the joining of fibre composite plastic sheets to metal sheets is in practical application limited to adhesive bonding or mechanical joining with additional fastener elements due to the large differences in physical properties. A new process chain based on plastic joining without fastener elements is proposed and first results on the mechanism and on the achievable strength of the new joints are shown. The process chain consists of three steps: First joining pins are added to the sheet metal by an additive manufacturing process. In a second step these pins are pierced through the fibre composite sheet with a local heating of the thermoplastic in an overlap setup. In the third and last step the joint is created by forming the pins with the upsetting process to create a shape lock. The shear strength of the joined specimens was tested in a tensile testing machine. The paper shows that even with a non-optimized initial setup joints can be realised and that the new process chain is a possible alternative to adhesive bonding.
1468
Authors: Ji Ung Choi, Woo Hyun Cho, Jong Hoon Yoon, Joon Tae Yoo, Ho Sung Lee
Abstract: It is known that the stiffened cylinder structure supports external pressure loads inaerospace and marine application subjected to hydrostatic pressure. For relatively low temperature,aluminum or composite cylinder can be appropriate, but at higher temperature, titanium or steel alloymust be considered. Nickel based alloys show excellent corrosion resistance and elevated temperaturemechanical strength so that these alloys are now successfully utilized for aerospace and engineapplication. This paper provides innovative
326
Authors: Ji Ung Choi, Woo Hyun Cho, Jong Hoon Yoon, Joon Tae Yoo, Ho Sung Lee
Abstract: It is well known that alloy 718 shows excellent mechanical strength and corrosion resistance and this alloy is now successfully utilized for aerospace and oil industry application. In order to design and manufacture components to satisfy the design requirements of the applied system, it is necessary to consider formability and weldability of the material. This paper provides experimental results of lap shear strength of welded specimens of alloy 718 with EBW(Electron Beam Welding) and LBW(Laser Beam Welding) and Brazing. The purpose is to determine the optimum welding method for overlap welding of alloy 718 for blow forming.
900
Authors: Ji Ung Choi, Woo Hyun Cho, Jong Hoon Yoon, Joon Tae Yoo, Ho Sung Lee
Abstract: It is known that the stiffened cylinder structure supports external pressure loads in aerospace and marine application subjected to hydrostatic pressure. For relatively low temperature, aluminum or composite cylinder can be appropriate, but at higher temperature, titanium or steel alloy must be considered. Nickel based alloys show excellent corrosion resistance and elevated temperature mechanical strength so that these alloys are now successfully utilized for aerospace and engine application. This paper provides innovative manufacturing process of producing stiffened cylinder for elevated temperature application.
591
Authors: Yoshitake Nishi, Kazunori Tanaka
185
Authors: Y. Abe, T. Kato, Kenichiro Mori
Abstract: To simplify the recycling of automobiles, aluminium alloy sheets were joined by means of a self-piercing rivet. Although steel rivets used in conventional self-pierce riveting are removed from the aluminium alloy sheets in recycling, the removal is not required for aluminium alloy rivets. The joined sheets with the rivets are directly melted due to the same material, aluminium. For the joining of aluminium alloy sheet by the aluminium rivets, the joinability was improved by the designed shape of the rivet and die. To pierce the upper sheet, the diameter and edge angle of the rivet are modified. The diameter of the depth and the cavity of the die were also designed from trial and error using finite element simulation. The effectiveness of the designed rivet and die were evaluated from an experiment on riveting. The aluminium alloy sheets were joined by the optimised aluminium alloy self-piercing rivet and their effectiveness measured.
79
Authors: Phacharaporn Bunyawanichakul, Patinya Kumsantia, Bruno Castanié
Abstract: Sandwich structures are widely used in the aerospace field, also for primary parts. However, due to the low strength of core properties, the failure behavior under high stress concentration such as joining position is hard to evaluate. This study is, at present, a key task to enable future exploitation of the joint for structural sandwich consisted of Carbon Fiber Reinforced Polymer (CFRP) face and a Honeycomb core made of phenolic impregnated NomexTM paper. Previous experimental investigations provided the failure mechanism of sandwich plates with hard points in the form of inserts, and special attention is focused on the problem of sandwich panels with inserts of the fully potted types. Numerical simulations are achieved in this work with good correlation based on experimental test.
500
Authors: P. Popper
719
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