Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1266-1271.doi: 10.13229/j.cnki.jdxbgxb20180291

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Forming limit prediction of high strength steel based on damage modified M⁃K model

Wen⁃quan LIU1(),Liang YING2,Hai RONG2,Ping HU2()   

  1. 1. Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, China
    2. School of Automotive Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2018-04-01 Online:2019-07-01 Published:2019-07-16
  • Contact: Ping HU E-mail:wqliu2012@mail.dlut.edu.cn;pinghu@dlut.edu.cn

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Abstract:

In order to understand the effect of inner damage evolution on the formability of sheet metal, a prediction method of forming limit coupled with GTN damage model was developed based on the M-K groove instability theory. The damage-related parameters of high strength steel 22MnB5 were calibrated accordingly. The critical void volume fraction was chosen as the instability criterion, which improves the physical significance of the prediction method. And the effects of loading path on the instability of sheet and damage evolution were also studied based on the theoretical calculation results. Meanwhile, the NAKAZIMA test was conducted, and the forming limit data under different loading path was obtained. The deformation characteristics of 22MnB5 sheet were also analyzed. By comparing with the experimental results, the validity of the proposed method was verified.

Key words: materials synthesis and processing technology, forming limit, M?K groove theory, GTN damage model, damage evolution

CLC Number: 

  • TG386

Fig.1

Schematic diagram of M?K model coupled with damage"

Fig.2

Evolution of void damage under different deformation modes"

Fig.3

Forming limit apparatus for high strength steel"

Fig.4

Fractured samples after bulging forming"

Fig.5

Strain field of a sample with width 80 mm at different deformation stages"

Fig.6

Comparison of the experimental and predicted forming limits"

Fig.7

Strain increment ratio at instability under different deformation paths"

Fig.8

Void evolution of area A under different paths"

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