Prediction and Verification of Forming Limit Diagrams Based on a Modified Shear Failure Criterion

• Published in: Chinese journal of mechanical engineering Vol. 36; no. 1; pp. 130 - 10
• Main Authors: Wang, Haibo, Wang, Zipeng, Yan, Yu, Xu, Yuanhui
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 31.10.2023; Springer Nature B.V; SpringerOpen
• Edition: English ed.
• Subjects: Aluminum base alloys; Constitutive equations; Constitutive relationships; Deformation; Electrical Machines and Networks; Electronics and Microelectronics; Engineering; Engineering Thermodynamics; Forming limit diagram; Forming limit diagrams; Heat and Mass Transfer; High strength steel; Instrumentation; Kelvin-Helmholtz instability; Loading path; Machines; Manufacturing; Mathematical analysis; Mechanical Engineering; Metal forming; Metal sheets; Modified shear failure criterion; Original Article; Power Electronics; Processes; Shear; Sheet metal forming; Smart Material; Stability criteria; Strain hardening; Theoretical and Applied Mechanics; TRIP steels; Loading path; Forming limit diagram; Modified shear failure criterion; Sheet metal forming
• ISSN: 2192-8258; 1000-9345; 2192-8258
• DOI: 10.1186/s10033-023-00954-x

The forming limit diagram plays an important role in predicting the forming limit of sheet metals. Previous studies have shown that, the method to construct the forming limit diagram based on instability theory of the original shear failure criterion is effective and simple. The original shear instability criterion can accurately predict the left area of the forming limit diagram but not the right area. In this study, in order to improve the accuracy of the original shear failure criterion, a modified shear failure criterion was proposed based on in-depth analysis of the original shear failure criterion. The detailed improvement strategies of the shear failure criterion and the complete calculation process are given. Based on the modified shear failure criterion and different constitutive equations, the theoretical forming limit of TRIP780 steel and 5754O aluminum alloy sheet metals are calculated. By comparing the theoretical and experimental results, it is shown that proposed modified shear failure criterion can predict the right area of forming limit more reasonably than the original shear failure criterion. The effect of the pre-strain and constitutive equation on the forming limits are also analyzed in depth. The modified shear failure criterion proposed in this study provides an alternative and reliable method to predict forming limit of sheet metals.