Predicting forming limit diagrams for AZ31 magnesium alloy and 7050 aluminum alloy by numerical simulation
Artikel i vetenskaplig tidskrift, 2021

Forming limit diagram (FLD) is the most intuitive method to evaluate and analyze the forming performance of sheet metal, which is widely used in production. To examine the formability of AZ31 magnesium alloy and 7050 aluminum alloy, the simplified bulging models based on the Nakazima experiment are established by ABAQUS finite element (FE) software, and the maximum punch force criterion is adopted as the instability criterion. The forming limit diagrams of 7050 high-strength aluminum alloy at room temperature and AZ31 magnesium alloy at warm working conditions are obtained by extracting the in-plane strain of the adjacent element of the maximum strain element at the moment of instability. Compared with experimental observation shows that the Nakazima virtual model established in this paper can accurately predict FLD. In addition, the influences of lubrication conditions and virtual punching speeds on the bulging process of AZ31 and AA7050 sheet metals are also investigated. The results show that the better the lubrication environment, or the lower the punching speed, the better the formability of the sheet, and reducing the punching speed has a more significant improvement effect on the formability of AZ31 sheets.

AZ31 magnesium alloy

Forming limit diagram (FLD)

7050 aluminum alloy

numerical simulation

Nakazima virtual model


Fengmei Xue

Taiyuan University of Technology

Yu Yan

Taiyuan University of Technology

Jincheng Kang

Student vid Chalmers

Journal of Strain Analysis for Engineering Design

0309-3247 (ISSN) 20413130 (eISSN)

Vol. 56 8 598-608


Teknisk mekanik

Annan materialteknik

Metallurgi och metalliska material



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