Transactions of Materials and Heat Treatment

Title：Research on forming limit for high-strength dual-phase steel based on MMC ductile fracture criterion

Authors： Yang Ting Zhang Qing Xing Chengliang Dong Yikang Li Xiaoguang

Unit： HBIS Material Technology Research Institute HBIS Group Hansteel Company

KeyWords： forming limit diagram high-strength dual-phase steel MMC ductile fracture criterion damage fracture

ClassificationCode：TG301

year,vol(issue):pagenumber：2022,47(8):255-260

Abstract：

For the high-strength dual-phase steel CR450/780DP sheet, the four kinds of tensile specimens were designed to perform uniaxial tensile tests, and the load-displacement curve and the surface full-field strain results were obtained. Then, the test results of the four kinds of specimens were benchmarked and analyzed by the finite element simulation analysis method, and the material hardening constitutive model and the history data such as stress triaxiality, Lode angle parameters and equivalent plastic strain were obtained. Furthermore, the fracture parameters of MMC ductile fracture criterion were calibrated by surface fitting optimization method, based on the Keeler formula and simplified MMC ductile fracture criterion, the theoretical and predicted forming limit diagrams of high-strength dual-phase steel CR450/780DP sheet were drawn respectively, and the predicted results were verified by the hemispherical rigid die bulging test. The comparison results show that the forming limit curve predicted based on the MMC ductile fracture criterion is in good agreement with the experimental data, which verifies the accuracy and applicability of the ductile fracture criterion for the damage and fracture prediction of high-strength dual-phase steel CR450/780DP sheet.

Funds：

作者简介：杨婷（1991-），女，硕士，工程师，E-mail：yangting@hbisco.com

Reference：

[1]Swift H W. Plastic in stability under plane stress [J]. Journal of the Mechanics and Physics of Solids, 1952, 1(1): 1-18.

[2]胡鹏, 彭林法，来新民，等. 薄板微冲压成形失稳分析与实验研究[J].上海交通大学学报,2011,45（1）：11-14.

Hu P, Peng L F，Lai X M，et al. Instability analysis and experimental study of micro stamping process with thin sheet[J].Journal of Shanghai Jiaotong University,2011,45(1):11-14.

[3]Hill R. On discontinuous plastic states, with special reference to localized necking in thin sheets [J]. Journal of the Mechanics and Physics of Solids, 1952, 1(1): 19-30.

[4]朱巍峰. 板料成形极限理论预测与应用[D].秦皇岛：燕山大学,2016.

Zhu W F. Sheet Forming Limit Theory Prediction and Its Application [D]. Qinhuangdao：Yanshan University, 2016.

[5]Marciniak Z, Kuczyński K. Limit strains in the processes of stretch-forming sheet metal [J]. International Journal of Mechanical Sciences, 1967, 9: 609-620.

[6]Keeler S P， Brazier W G. Relationship between laboratory material characterization and press shop formability[A]. Proceedings of Microalloying[C]. New York:1977.

[7]Keeler S P, Backhofen W A. Plastic instability and fracture in sheet stretched over rigid punches[J]. ASM Transaction Quarterly, 1963, 56(11): 25-48.

[8]Dong G J, Chen Z W, Yang Z Y, et al. Comparative study on forming limit prediction of AA7075-T6 sheet with M-K model and Lou-Huh criterion[J].Transactions of Nonferrous Metals Society of China,2020,30(6):1463-1477.

[9]陈志伟, 赵长财, 董国疆, 等.高强铝板韧性断裂准则参数求解及其成形极限[J].中国有色金属学报,2020,30(4):763-774.

Chen Z W, Zhao C C, Dong G J, et al. Calculation of ductile fracture parameters and forming limit of high-strength aluminum sheet[J].The Chinese Journal of Nonferrous Metals,2020,30(4):763-774.

[10]余海燕, 王友. 5052铝合金冲压成形过程中韧性断裂的仿真研究[J].中国有色金属学报,2015,25(11):2975-2981.

Yu H Y, Wang Y. Bulging simulation of ductile fracture of 5052 aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2015,25(11):2975-2981.

[11]张学广. 基于损伤理论的铝合金板料成形极限研究[D].长春：吉林大学,2016.

Zhang X G. Research on the Forming Limit of Aluminum Alloy Sheet Based on Damage Theory[D]. Changchun：Jilin University, 2016.

[12]Münstermann S, Wechsuwanmanee P, Liu W Q, et al. Surface roughness influences on localization and damage during forming of DP1000 sheet steel[J]. Procedia Manufacturing, 2019, 29: 504-511.

[13]Habibi N, Ramazani A, Sundararaghavan V, et al. Failure predictions of DP600 steel sheets using various uncoupled fracture criteria[J]. Engineering Fracture Mechanics, 2018, 190(1): 367-381.

[14]Bai Y L, Wierzbicki T. Application of extended Mohr-Coulomb criterion to ductile fracture[J]. International Journal of Fracture, 2010, 161: 1-20 .

[15]GB/T 15825.8—2008, 金属薄板成形性能与试验方法第8部分：成形极限图(FLD)测定指南[S].

GB/T 15825.8—2008, Sheet metal formability and test methods—Part 8:Guidelines for the determination of forming-limit diagrams[S].

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