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۱Experimental Study and Finite Element Simulation of Tube Hydroforming Process of Bi–layered Aluminum–Copper with Axial Feeding
اطلاعات انتشار: کنفرانس بین المللی پژوهش در علوم و تکنولوژی، سال
تعداد صفحات: ۱۹
Aluminum alloys, due to their light weight and resistant against corrosion, play a significant role in aviation and automotive industry. Hydroforming process can be used for the formation process of Aluminum alloys.In some applications such as applications in transferring very high temperature corrosive fluids in which , use of Bi–layered pipes are recommended.This paper is divided to two parts: in the first part, formation process of a two layered isotropic Aluminum–Copper pipe is simulated using a 3D finite element method. In the second part, to validate the simulation results, an experimental machine of hydroforming pipe with the capability of controlling the internal pressure and axial feeding is designed and built. Linear loading curve was selected as the best loading curve for the formation process based on a comparison between three different type of loading curves (linear, step–wise, and spline). Also, comparison between thickness distribution of hydroforming of single layer and two layered pipes showed that two–layered pipe has more homogenous distribution.According to the results, wrinkles created before bulging the pipe plays the role of axial feeding very well and the pipes have better thickness distribution.Experimental results verified simulation outcome can be used to predict loading curves with a reasonable tolerance.<\div>

۲Computer Aided Design of the Tube Hydroforming and Dual Hydroforming Processes
اطلاعات انتشار: Journal of Modern Processes in Manufacturing and Production، چهارم،شماره۴، Autumn ۲۰۱۵، سال
تعداد صفحات: ۱۴
This paper presents a control model of the hydroforming and the dual hydroforming process of a tube. The theoretical part includes calculations to measure the change in tube thickness through the developed process. The hydroforming and the dual hydroforming processes are simulated in the SOLIDSIMULATION software and the static and the dynamic simulations are modeled. The obtained results for the T–shape and the X–shape dies are compared and investigated. Moreover, the developed software in MATLAB calculates the process parameters. The inputs of the developed software are the maximum internal pressure and the axial feed that could be adjusted with linear and non–linear functions. Furthermore, the material of the tube, as well as the tube’s parameters, such as length, thickness, and radius, must to be given to the software. However, the properties of the tube could automatically support the CAD model. The software–generated results are the applied stress, displacement, and the energy through the process. This paper deals with the control strategy model developed in thesoftware packages. The obtained results are then subsequently compared with those of several experiments.
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