This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Characterization of Edge Fracture in Various Types of Advanced High Strength Steel
Technical Paper
2011-01-1058
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In vehicle crash events there is the potential for fracture to occur at the processed edges of structural components. The ability to avoid these types of fractures is desired in order to minimize intrusion and optimize energy absorption. However, the prediction of edge cracking is complicated by the fact that conventional tensile testing can provide insufficient data in regards to the local fracture behavior of advanced high strength steels. Fracture prediction is also made difficult because there can be inadequate data on how the cutting processes used for hole piercing and blanking affect the edge condition. In order to address these challenges, research was undertaken to analyze edge fracture in simple test pieces configured with side notches and center holes. Test specimens were made from a number of advanced high strength steels including 590R (C-Mn), 780T (TRIP), 980Y (dual phase) and hot stamp 1500 (martensitic). Edges were prepared by three different cutting processes: shearing, laser, and water jet ablation. The specimens were pulled to failure and local fracture strains were measured by digital image correlation. Component level tests were also done on simple hat sections that featured a notch cut into the flange and side wall by either water jet or punching. These hat sections were made from select steel grades and were deformed in a three-point bend crush mode to initiate failure at the notch. The results indicate that edge fracture in high strength steels is influenced by both edge condition and specimen geometry. In addition, it was concluded that certain material grades can be more notch or punch sensitive than others depending on their metallurgical structure.
Recommended Content
Authors
- James Dykeman - Honda R&D Americas Inc.
- Skye Malcolm - Honda R&D Americas Inc
- Benda Yan - Arcelormittal Global R&D- East Chicago
- Jayanth Chintamani - Arcelormittal Global R&D- East Chicago
- Gang Huang - Arcelormittal Global R&D- East Chicago
- Naveen Ramisetti - Arcelormittal Global R&D- East Chicago
- Hong Zhu - Arcelormittal Global R&D- East Chicago
Citation
Dykeman, J., Malcolm, S., Yan, B., Chintamani, J. et al., "Characterization of Edge Fracture in Various Types of Advanced High Strength Steel," SAE Technical Paper 2011-01-1058, 2011, https://doi.org/10.4271/2011-01-1058.Also In
References
- Juang, G. Yan, B. Zhu, H. “Measurement of Fracture Strains for Advanced High Strength Steels (AHSS) Using Digital Image Correlation,” SAE Int. J. Mater. Manuf. 2 1 482 486 2009 10.4271/2009-01-1174
- Dykeman, J. Hoydick, D. Link, T. Mitsuji, H. “Material Property and Formability Characterization of Various Types of High Strength Dual Phase Steel,” SAE Technical Paper 2009-01-0794 2009 10.4271/2009-01-0794
- Walp, M.S. “Impact Dependant Properties of Advanced and Ultra High Strength Steels,” SAE Technical Paper 2007-01-0342 2007 10.4271/2007-01-0342
- Lee, S. Speer, J. Matlock, D. Chin, K. “Analysis of Stretch Flangeability using Ductile Failure Model,” The 3 rd International Conference on Advanced Structural Materials Gyeongju, Korea August 22 24 2006
- Lee, S. Cho, Y. Chin, K. “Analysis of Stretch Flangeability Using a Ductile Fracture Model,” Posco Technical Report 10 1 2007
- Hosegawa, K. Kawanura, K. Urabe, T. Hosoya, Y. “Effects of Microstructure on Stretch-flange-formability of 980 MPa Cold-rolled Ultra High Strength Steel Sheets,” ISIJ International 44 3 603 609 2004