A Novel Ductile Criterion for Hot Forming and Its Applicability

Abstract

Abstract:

In order to predict occurrence of cracks of heavy forging equipment or accessories during hot forming, the high-temperature fracture behaviors of No. 50 steel were investigated by using the experimental thermodynamic method. The results show that the critical fracture strain is a function of the temperature and strain rate. Based on these results and the theory of damage mechanics, a ductile criterion was proposed, which could predict the occurrence of cracks. Besides, the accuracy of the proposed criterion was verified by conducting upsetting tests with different deformations and the corresponding simulation. Additionally, the applicability of the proposed criterion was investigated by implanting the criterion and various uncoupled criteria into simulation. The result shows that the proposed criterion can best predict the occurrence and location of cracks.

Key words: hot deformation, ductile fracture criterion, finite element analysis, heavy forging

CLC Number:

HE Jianli,XIAO Yanhong,CUI Zhenshan,CHEN Fei. A Novel Ductile Criterion for Hot Forming and Its Applicability[J]. Journal of Shanghai Jiaotong University, 2013, 47(11): 1707-1711.

References

［1］黄建科，董湘怀. 基于细观损伤模型预测金属成形过程中的韧性断裂形式［J］. 上海交通大学学报, 2009, 43(5): 700704.

HUANG Jianke, DONG Xianghuai. Prediction of ductile fracture in metalforming processes based on mesodamage model［J］. Journal Shanghai Jiaotong University, 2009, 43(5): 700704.

［2］Jackiewicz J. Use of a modified Gurson model approach for the simulation of ductile fracture by growth and coalescence of microvoids under low, medium and high stress triaxiality loadings［J］. Eng Fract Mech, 2011, 78(3): 478502.

［3］Xue Z, Pontin M G, Zok F W, et al. Calibration procedures for a computational model of ductile fracture［J］. Eng Fract Mech, 2010, 77(3): 492509.

［4］Cockcroft M G, Latham D J. Ductility and the workability of metals［J］. J Inst Met, 1968, 96: 3339.

［5］Brozzo P, Deluca B, Rendina R. A new method for the prediction of formability limits in metal sheetssheet metal forming and formability［C］// Proceedings of the 7th Biennial Conference of the International Deep Drawing Research Group. Ohio: Metals Park, 1972: 1836.

［6］Lou Y S, Huh H, Lim S L, et al. New ductile fracture criterion for prediction of fracture forming limit diagrams of sheet metals［J］. Int J Solids Struct, 2012, 49(25): 36053615.

［7］McClintock F A. A criterion for ductile fracture by growth of holes［J］. J Appl Mech Trans ASME, 1968, 35: 363371.

［8］Oyane M. Criteria of ductile fracture strain［J］. Bull JSME, 1972, 15(90): 15071513.

［9］Tekoglu C, Leblond J B, Pardoen T. A criterion for the onset of void coalescence under combined tension and shear［J］. J Mech Phys Solids, 2012, 60(7): 13631381.

［10］Alexandrov S, Wang P T, Roadman R E. A fracture criterion of aluminum alloys in hot metal forming［J］. J Mater Process Technol, 2005, 160(2): 257265.

［11］Li H, Fu M W, Lu J, et al. Ductile fractureExperiments and computations［J］. Inter J Plast, 2011, 27(2): 147180.

［12］Kim N H, Oh C S, Kim Y J, et al. Comparison of fracture strain based ductile failure simulation with experimental results［J］. Int J Pres Ves Pip, 2011, 88(10): 434447.

［13］He J L, Cui Z S, Chen F, et al. The new ductile fracture criterion for 30Cr2Ni4MoV ultrasupercritical rotor steel at elevated temperatures［J］. Mater Design, 2013, 52: 547555.

［14］Bhattacharya S S, Satishnarayana G V, Padmanabhan K A. A generic analysis for hightemperature powerlaw deformation: the case of linear ln(strain rate)ln(stress) relationship［J］. J Mater Sci, 1995, 30(23): 58505866.

［15］Nguyen D T, Park J G, Kim Y S. Ductile fracture prediction in rotational incremental forming for magnesium alloy sheets using combined kinematic/isotropic hardening model［J］. Metall Mater Trans, A, 2010, 41(8): 19831994.

［16］Xiao X. On the measurement of true fracture strain of thermoplastics materials［J］. Polym Test, 2008, 27(3): 284295.

［17］Zhang X, Zeng W, Shu Y, et al. Fracture criterion for predicting surface cracking of Ti40 alloy in hot forming processes［J］. T Nonferr Metal Soc China, 2009, 19(2): 267271.

［18］Maropoulos S, Ridley N. Inclusions and fracture characteristics of HSLA steel forgings［J］. Mater Sci Eng, A, 2004, 384(12): 6469.

[1]	JIA Mizhi, XU Liming, LIN Nan, NAN Bohua, WANG Kun, CAI Deng’an, ZHOU Guangming. Structural Design and Mechanical Properties of Fissile Cover with Rebound and Reset Functions [J]. Air & Space Defense, 2022, 5(2): 8-16.
[2]	FENG Qiping (冯齐平), CHU Fengting (储沨婷), CHEN Rongjing (陈荣敬), PAN Xiaogang (潘晓岗). Effects of Mandibular Extractions with Clear Aligners: A Finite Element Analysis [J]. J Shanghai Jiaotong Univ Sci, 2021, 26(3): 377-382.
[3]	PAN Shengxuan (潘晟轩), ZOU Diyang (邹第洋), PAN Xiaogang(潘晓岗), TSAI Tsung-Yuan (蔡宗远). Effect of Attachment on Movement Control of the Central Incisor Using Invisible Orthodontics: In-Silico Finite Element Analysis [J]. J Shanghai Jiaotong Univ Sci, 2021, 26(3): 383-390.
[4]	AN Qingsheng, SUN Lidong, WU Qiusheng. Design of Carbon Fiber Reinforced Composite Launch Tube [J]. Air & Space Defense, 2021, 4(2): 13-.
[5]	ZHANG Cong, JIA Dejun, LI Fanchun, XU Yitong, ZHANG Yuan. Design and Simulation of a Titanium Alloy Lattice Bone Plate for 3D Printing [J]. Journal of Shanghai Jiao Tong University, 2021, 55(2): 170-178.
[6]	WANG Wei，WANG Min，HU Juncong，BAO Yidong，JIN Xia，CHEN Wenliang. Virtual Matching Method Based on Finite Element Simulation in Automotive Panel [J]. Journal of Shanghai Jiaotong University, 2020, 54(5): 532-543.
[7]	ZHAO Yong, JI Xiaojun, DAI Ming, QI Hongli, GAO Junkai. Analysis of Transmission Power and Efficiency of Side-Mounted Inductive Power Supply System for Metal Rotary Shafts [J]. Journal of Shanghai Jiao Tong University (Science), 2020, 25(3): 273-280.
[8]	ZHOU Min, GAO Mingze, LI Chuang, WANG Liancheng. Cargo Hold Structure Optimization of Small and Medium-Sized Duplex Stainless Steel Chemical Tankers [J]. Journal of Shanghai Jiao Tong University (Science), 2020, 25(3): 340-351.
[9]	WANG Dongwei,LIU Mingxing,WU Xiao,YANG Rui,DAI Jun’an. Transient Impact Dynamics of Electronic Cabinet [J]. Journal of Shanghai Jiaotong University, 2019, 53(Sup.1): 109-117.
[10]	MA Zhiqiang,LOU Yunfeng,LI Junjie,JIN Xianlong. Explicit Asynchronous Time Steps Parallel Computational Method for Structural Dynamics Based on Multiple Overlapping Nodes [J]. Journal of Shanghai Jiaotong University, 2019, 53(9): 1100-1106.
[11]	SHEN Jie,ZHANG Yansong. Finite Element Analysis of Weld Nugget Formation in Weld-Bonding of Three Stacks of Steel Sheets [J]. Journal of Shanghai Jiaotong University, 2019, 53(6): 726-733.
[12]	LI Yulin, AN Qingsheng, YANG Kunhao, TANG Xiaofeng, LIU Longtao. Analysis and Validation of Integrated Thermal Protection and Load Bearing for Composite Material Cable Cover [J]. Air & Space Defense, 2019, 2(3): 1-7.
[13]	ZHANG Liming,LI Yuanyuan,XUE Hongxiang,TANG Wenyong. The Analysis of Ultimate Strength of Stiffened Panels Exposed to Fire Under Temperature Increase Condition [J]. Journal of Shanghai Jiaotong University, 2019, 53(12): 1420-1427.
[14]	LI Dongwei, WANG Lei, ZHANG Cong, ZHAO Yixi. Analysis of the Effect of Pre-Hem Steel Stopping Position on Boundary Roll-in [J]. Journal of Shanghai Jiao Tong University, 2019, 53(1): 100-104.
[15]	WANG Dong-shi, ZHANG Xi, JIANG Ai-guo, FAN Zan. Research on Sealing Performance of O-Ring for Deep-Sea Beacon Based on ANSYS [J]. Ocean Engineering Equipment and Technology, 2018, 5(增刊): 128-135.