| Autor: |
X. Lemoine, Alain Molinari, L. Durrenberger |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Journal of Materials Processing Technology. 211:1937-1947 |
| ISSN: |
0924-0136 |
| DOI: |
10.1016/j.jmatprotec.2011.06.015 |
| Popis: |
The effects of pre-strain on the crushing properties of a crash-box structure are reported for two Advanced High Strength Steels produced by ArcelorMittal (Dual-Phase DP600 and Transformation Induced by Plasticity TRIP780 steels). In addition, the effect of a bake-hardening treatment is studied on the TRIP780 steel. The material's behaviors have been determined in tensile loading in a wide range of strain-rates ( 8 × 10 − 3 s − 1 ≤ e ˙ ≤ 10 3 s − 1 ) including strain-rate jump tests from quasi-static to dynamic loading. These interrupted tests allow us to characterize the effect of the (quasi-static) forming process on the subsequent dynamic behavior associated to the crash event. A phenomenological visco-plastic model, based on the evolution of an internal variable, has been implemented in PAMCRASH using a user-defined subroutine in order to simulate the crushing of the crash-boxes. A simple approach is proposed to account for the bake-hardening treatment in numerical simulations. A good correlation between experimental and predicted mean crush forces is obtained. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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