Numerical simulation to reduce von Mises and radial stresses on unsupported area based on warm hydroforming

Publish Year: 1400
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

ISME29_049

تاریخ نمایه سازی: 13 تیر 1400

Abstract:

Hydroforming is one of the potential way to form light materials. Its benefits can be accounted as a part of coherence and reducing steps of forming parts which leads to decrease in cost and time of production. Although there is still problem to shape this type of material which here is AA۲۲۱۹ aluminum alloy in room temperature. Warm hydroforming could be considered as a practical alternative for both low thickness and light materials. There are two types of wrinkling; first one is flange wrinkling and another is unsupported wrinkling (or side-wall wrinkling) due to the compressive hoop stress in the sheet metal forming. Flange wrinkling could be controlled by blank holder which imposing pressure on sheet metal in flange zone. The control of wrinkling in the flange area has been investigated by many researchers via analytical models, experiments and simulation. But things get tricky in the unsupported area due to the blank is free of constraint. Therefore, the compressive stress required to initiate the wrinkling is lower than that one in the flange area. The purpose of this study is identifying optimum temperatures of fluid medium and also other components in order to decrease von Mises and radial stresses in comparison with Yi-Zhe Chen’s experimental, analytical and simulation study of conventional hydroforming so that producing samples without wrinkling defect in area where blank just has been separated from die (called point B hereinafter) as mentioned unsupported area, (see figure ۱). The analysis has been carried out by LS-DYNA FEA software.

Authors

Javad Aliakbari

Islamic Azad University, Damavand Branch, Damavand, Iran

Sattar Jedari Salami

Islamic Azad University, Central Tehran Branch, Tehran, Iran