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Effects of Material Bending and Hardening on Dynamic Dent Resistance
Technical Paper
2005-01-0832
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In the first part of this paper, a previously published acceleration compensation methodology for dynamic dent testing [1] was successfully applied to calculate dent loads and applied energy in dynamic dent testing. This procedure was validated utilizing a hydraulic controlled dynamic dent tester on a number of low carbon and bake hardenable steels. In the second part of this study, the impact of strain rate on material bending and hardening in high-speed dynamic dent resistance testing was studied. Previous work [2] investigated these factors in static dent resistance. The procedure utilized in that research was further developed and adapted for high speed testing and used as a basis for a new, single loading incremental dynamic dent test. This new test was used to investigate the effects of material bending and hardening in high-speed dynamic dent resistance.
Testing incorporated laboratory produced stretch dome panels with 2% biaxial strains as test specimens. For the first part of the experiments, four different steel grades were used: DQSK, BH210, BH280 and DP600. For the second part of the study, the same steels were used except BH250 was used in place of BH280 for availability reasons. The results revealed a significantly higher applied energy for the single loading condition than for the incremental loading condition for both baked and unbaked materials of the same dent depth. Although the single loading dent test condition more realistically simulates the dent condition in real world situations, the incremental loading dent test condition provides a more conservative result. Due to higher impact energy in the dynamic testing, the 0.1 mm visible dent depth commonly used as static dent test criterion may need to be modified.
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Citation
Shih, H. and Horvath, C., "Effects of Material Bending and Hardening on Dynamic Dent Resistance," SAE Technical Paper 2005-01-0832, 2005, https://doi.org/10.4271/2005-01-0832.Also In
Innovations in Modeling and Testing of Steel Structures for Automotive Applications, and Front and Rear Bumper Systems
Number: SP-1954; Published: 2005-04-11
Number: SP-1954; Published: 2005-04-11
References
- Shih Hua-Chu Shi Ming F. “Development of Dynamic Dent Resistance Testing Procedures” SAE Paper No. 2003-01-0607
- Shih Hua-Chu Horvath Curt D. “Effects of Material Bending and Hardening on Static Dent Resistance” SAE Paper No. 2003-01-0605
- Johnson, T. E. Jr. Schaffnit W. O. “Dent Resistance of Cold-Rolled Low-Carbon Steel Sheet” SAE Paper No. 730528 1973
- Painter M. J. Pearce R. “The Denting Behavior of Sheet Materials” Proceedings of 12 th IDDRG 399 410 1982
- Nomura S. Yutori Y. Iwaya J. Miyahara M. Kokubo I. “A Study of Dynamic Dent Resistance” Proceedings of 13 th IDDRG 394 402 1984
- Shi Ming F. Meuleman David J. et al. “An Evaluation of the Dynamic Dent Resistance of Automotive Steels” SAE Paper No. 910287 1991
- Shi Ming F. Zurdosky Stephen J. “Dynamic Dent Resistance Performance of Steels and Aluminum” SAE Paper No. 930786 1993
- Thomas Dylan et al. “Static and Dynamic Denting of Paint Baked AA6111 Panels: Comparison of Finite Element Predictions and Experiments” SAE Paper No. 2001-01-3047
- Burley C. E. Niemeier B. A. Koch G. P. “Dynamic Denting of Autobody Panels” SAE Paper No. 760165 1976
- Auto/steel Partnership (A/SP) Dent Resistance Task Force Internal Report 1996