Determination and modeling of dynamic characteristics of automotive sheet metals for FE crash simulations

von Chongyang Zeng

198 Seiten, Taschenbuch

Kurzbeschreibung des Verlags

Vehicle crashes subject automotive sheet metals to multiaxial deformation and fracture across strain rates from 0.0001/s to 1000/s. This thesis examines the comprehensive effects of stress state, strain rate, and temperature on the yielding, hardening, damage, and fracture of H340 and DP1000 steels. High-speed tensile tests were conducted on specially designed specimens, eliminating system ringing and enabling accurate force measurements at strain rates exceeding 1000/s. Tests covered material orientations (0°, 45°, 90°) and temperatures (-30°C-280°C), tracking strain fields via DIC technique and capturing specimen temperature changes with thermal imaging. A new yield model, referred to as the YldSRH model, accounting for non-uniform strain rate hardening, was coupled with a strain-rate and temperature-dependent damage mechanics model (e²MBW) to predict anisotropic plasticity and fracture behavior of H340 and DP1000 under different loading conditions. The coupled YldSRH+e²MBW model was validated through experimental and FE simulation comparisons, offering enhanced accuracy for crash modeling.

• Reihe: Siegener Schriftenreihe Automobiltechnik
• ISBN: 9783961821983
• Sprache: Englisch
• Erscheinungsdatum: 22.01.2025
• Genre: Technik/Maschinenbau, Fertigungstechnik
• Verlag: universi - Universitätsverlag Siegen