Numerical Analysis of Sheet Metal Forming Limit for Local Forming

Abstract:

Generally, the forming limit diagram is widely applied to predict the sheet necking and fracture in the conventional sheet forming process. In recent years, the fact that the forming limit is much higher using Incremental sheet forming (ISF) than that obtained in conventional sheet forming, has become a research hotspot in forming mechanism of local forming process. In this paper, the geometrical imperfection in the thickness was presumed to represent local weakening zone and the BAMMAN_DAMAGE material model which using void to describe non homogenization caused by geometric imperfection, were used respectively to investigate the effect of geometry imperfection on the sheet forming limit. Based on the W.C. Emmens’ experiment, the reason and mechanism of enhancement of forming limit during incremental forming was studied through the numerical simulation method. And the variations of stress and strain during the forming process were also studied.

• Periodical: Advanced Materials Research (Volume 1028)
• Pages: 76-83
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1028.76
• Online since: September 2014
• Authors: Rui Yang*, Yu Liu, Peng Fei Wen, Jun Hua Zhang
• Keywords: Forming Limit, Incremental Sheet Forming, Local Forming, Necking

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