This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Crash Analysis of Auto-body Structures Considering the Strain-Rate Hardening Effect
Technical Paper
2000-05-0200
Annotation ability available
Sector:
Event:
Language:
English
Abstract
The crashworthiness of vehicles with finite element methods depends on the geometry modeling and the material properties. The vehicle body structures are generally composed of various members such as frames, stamped panels and deep-drawn parts from sheet metals. In order to ensure the impact characteristics of auto-body structures, the dynamic behavior of sheet metals must be examined to provide the appropriate constitutive relation. In this paper, high strain-rate tensile tests have been carried out with a tension type split Hopkinson bar apparatus specially designed for sheet metals. Experimental results from both static and dynamic tests with the tension split Hopkinson bar apparatus are interpolated to construct the Johnson-Cook and a modified Johnson-Cook equation as the constitutive relation, that should be applied to simulation of the dynamic behavior of auto-body structures. Simulation of auto-body structures has been carried out with an elasto-plastic finite element method with explicit time integration. The stress integration scheme with the plastic predictor elastic corrector method is adopted in order to accurately keep track of the stress-strain relation for the rate-dependent model accurately. The crashworthiness of the structure with quasi-static constitutive relation is compared to the one with the rate-dependent constitutive model. Numerical simulation has been carried out for frontal frames and a hood of an automobile. Deformed shapes and the impact energy absorption of the structure are investigated with the variation of the strain rate.
Recommended Content
Authors
- Woo Jong Kang - Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology 373-1 Kusong-dong, Yusong-gu, Taejon, 305-701, Korea
- Hoon Huh - Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology 373-1 Kusong-dong, Yusong-gu, Taejon, 305-701, Korea
Topic
Citation
Kang, W. and Huh, H., "Crash Analysis of Auto-body Structures Considering the Strain-Rate Hardening Effect," SAE Technical Paper 2000-05-0200, 2000.Also In
References
- Kolsky, H. 1949 Stress Wave in Solids Dover New York 41 65
- Follansbee, P. S. 1978 The Hopkinson Bar Metal Handbook 9th Edition 8 198 203
- Li, M. Wang, R. Han, M. B. 1993 A kolsky Bar: Tension, Tension-tension Experimental Mechanics March 7-14
- Kang, W. J. Cho, S. S. Huh, H. Chung, D. T. 1998 Identificatoin of Dynamic Behavior of Sheet Metals for an Auto-body with Tension Split Hopkinson Bar SAE 981010 115 119
- Johnson, G. R. Cook, W. H. 1983 A Constitutive Model and Data for Metals Subjected to Large Strains, High Strain Rates and High Temperatures Proceedings of the Seventh International Symposium on Ballistics The Hague The Netherlands 541 547
- Zhao, H. Gary, G. 1996 The testing and behavior modeling of sheet metals at strain rates from 10 −4 to 10 4 s −1 Materials Science and Engineering A207 46 50
- Kang, W. J. Cho, S. S. Huh, H. Chung, D. T. 1999 Modified Johnson-Cook Model for Vehicle Body Crashworthiness Simulation Int. J. Vehicle Design 21 4/5 424 435
- Nemat-Nasser, S. Chung, D. T. 1992 An Explicit Constitutive Algorithm for Large-strain, Large-strain-rate Elastic-viscoplasticity Comput. Methods Appl. Mech. Engrg. 95 205 219
- Huh, H. Han, S. S. Yang, D.Y. 1990 Elasto-Plastic Finite Element Analysis with Directional Reduced Integration in Sheet Metal Forming Process, 3 rd ICTP in Kyoto Japan Advanced Technology of Plasticity 3 1375 1381
- Belytschko, T. Wong, B. L. Chiang, H. Y. 1992 Advances in one-point quadrature shell element Comput. Methods Appl. Mech. Engrg. 96 93 107
- Belytschko, T. Leviathan, I. 1994 Physical stabilization of the 4-node shell element with one point quadrature Comput. Methods Appl. Mech. Engrg. 113 321 350