Experimental Study of Shear Fracture on Advanced High Strength Dual-Phase Steels

Journal of Shanghai Jiaotong University ›› 2011, Vol. 45 ›› Issue (11): 1695-1699.

• Metallography and Metallurgical Technology • Previous Articles Next Articles

Experimental Study of Shear Fracture on Advanced High Strength Dual-Phase Steels

(Shanghai Key Laboratory of Digital Autobody Engineering, Shanghai Jiaotong University, Shanghai 200240, China)

Received:2010-10-22 Online:2011-11-30 Published:2011-11-30

Abstract

Abstract: Fracture characteristics of advanced high strength DP(dual-phase) sheets in stretch-bending over a tight die radius were investigated through flanging and groove-shape dies. Flanging result shows the higher the strength grade of DP sheet is, the more chance shear fracture occurs. The groove-shape tests and simulations suggest the shear fracture around the tight radius only occurs under high BHF, and necking on the wall happens when BHF is low. The eventual failure mode during sheet metal forming operations of AHSS is viewed as the competition between necking and shear fracture, whichever criterion is satisfied first.

Key words: advanced high strength dualphase(DP) steels, strength grade, blank hold force, necking instability, shear fracture

CLC Number:

TG386

References

［1］马鸣图，Shi M F. 先进的高强度钢及其在汽车工业中的应用［J］. 钢铁，2004，39(7)：6872.

MA Mingtu, SHI M F. Advanced high strength steel and its applications in automobile industry［J］. Iron and Steel, 2004，39(7)：6872.

［2］Sriram S,Wong C,Huang M, et al. Stretch bendability of advanced high strength steels ［DB/CD］. WARRENDALE PA USA: SAE Technical Paper, 20030303.［3］Walp M S, Wurm A, Siekirk III J F, et al. Shear fracture in advanced high strength steels［DB/CD］. WARRENDALE PA USA: SAE Technical Paper, 20060403.

［4］Huang M, Zhang L, Yang L. On the failure of AHSS at tooling radius［C］//Pavel Hora. ETH Zurich Numisheet. Switzerland: Institute of Virtual Manufacturing, 2008:307309.

［5］Luo M, Wierzbicki T. Numerical failure analysis of a stretchbending test on dualphase steel sheets using a phenomenological fracture model ［J］. Int J Solids Struct, 2010, 47(2223): 30843102.

［6］Zeng D, Xia Z C, Shih H C, et al. Development of shear fracture criterion for dualphase steel stamping［DB/CD］. WARRENDALE PA USA; SAE Technical Paper, 20090420.

［7］Shih H C, Shi M F, Zeng D, et al. Development of empirical shear fracture criterion for AHSS［DB/CD］. WARRENDALE PA USA: SAE Technical Paper, 20100412.

［8］Erdogan M, Tekeli S. The effect of martensite volume fraction and particle size on the tensile properties of a surfacecarburized AISI 8620 steel with a dualphase core microstructure［J］. Materials Characterization, 2002, 49(5): 445454.

［9］Wu J, Zhou D J, Zhang L, et al. A failure criterion for stretch bendability of advanced high strength steels［DB/CD］. WARRENDALE PA USA: SAE Technical Paper, 20060403.

［10］Konieczny A A. On formability assessment of the automotive dual phase steels［DB/CD］. Warrendale PA USA: SAE Technical Paper, 20011016.

［11］Keeler S P, Brazier W G. Relationship between laboratory material characterization and press shop formability［C］//Proceedings of Conference on Microalloy 75. New york:Union Carbide Corp,1977: 517528.

［12］胡星,李淑慧.高强度钢板压边力设计及敏感性分析［J］.锻压技术，2007,32(6):6872.

HU Xing, LI Shuhui. Design and sensitivity analysis of blank holding force for high strength steel sheet［J］. Forging and Pressing Technology, 2007,32(6):6872.

[1]	HE Chunfeng,ZHAO Yixi,HUANG Sheng. Microstructural Study of Advanced High Strength Dual-Phase Steels Sheet Under Stretch-Bending Forming Process [J]. Journal of Shanghai Jiaotong University, 2014, 48(05): 618-623.
[2]	XIE Zhen,LI Meng,WANG Wurong,WEI Xicheng. Stretch Bending Limit of Dual Phase Sheet and Its Numerical Simulation [J]. Journal of Shanghai Jiaotong University, 2013, 47(05): 760-765.
[3]	. Study on Limit Formability of 1 000 MPa Dual Phase Steel [J]. Journal of Shanghai Jiaotong University, 2011, 45(11): 1653-1656.

Experimental Study of Shear Fracture on Advanced High Strength Dual-Phase Steels

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 3

Recommended Articles

Metrics

Comments