Topic
Hydroforming
About: Hydroforming is a research topic. Over the lifetime, 2796 publications have been published within this topic receiving 26293 citations. The topic is also known as: Bulge forming.
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TL;DR: Li et al. as mentioned in this paper investigated the application of thick shell element in finite element analysis of sheet metal forming process with pressure reacting on both sides of the blank, and the results showed that the normal stress in the thickness direction caused by double-sided pressure reduces the material thickness and increases plastic strain and effective stress in forming zone.
16 citations
TL;DR: In this paper, the springback behavior of a single-layered non-homogeneous bellows was investigated in a finite element (FE) analysis, and the results showed that after springback, the U-shaped convolution profile is changed to tongue shape accompanied by a 2.5~38.5% axial elongation and a 0.1~0.6% radial shrinkage.
Abstract: Due to the complicated material and structural characteristics of bi-layered non-homogeneous bellows (BNBs) in hydroforming, the bellow deviates easily from its designed profile and this inevitable phenomenon results in a low forming precision. Therefore, it is important to study the springback behavior of bellows for precision forming. Based on finite element (FE) analysis, comparative studies on profiles of single-layered bellows, bi-layered homogeneous bellows (BHBs), and BNBs with two expansion ratios (k, the ratio of outer-to-inner diameter) k = 1.2 and k = 1.6 as well as two materials 304SS and Inconel 718 are implemented. The springback behaviors of different simulation settings are investigated, and several conclusions are drawn: (1) after springback, the U-shaped convolution profile is changed to tongue shape accompanied by a 2.5~38.5% axial elongation and a 0.1~0.6% radial shrinkage; (2) the springback tendency grows with the increase of number of layers, the improvement of mechanical properties of material, and the decrease of expansion ratio.
16 citations
16 citations
TL;DR: In this article, three-dimensional finite element simulations of the hydroforming, hydropiercing and wall extrusion of a DP600 steel tube were performed using different damage criteria, including the constant equivalent plastic strain, with and without cut-off stress-triaxiality values (CEPS+C and CEPS, respectively) and the Johnson-Cook (JC) damage criterion was considered as phenomenological damage models, and the Gurson-Tvergaard-Needleman (GTN) criterion was used as a micro-mechanical damage model.
16 citations