Crash behaviour and light weight have become the major design criteria for car bodies. Modern high strength steels offer appropriate solutions for these demands. The prediction of the crash behaviour in simulation programs requires the information on materials behaviour during dynamic testing. The reduction of the signal waviness and the inertia effects at strain rates above 50 per s are major issues in dynamic tensile tests. Different techniques for load and strain measurement are compared and evaluated with regard to accuracy and testing effort. Advantages and drawbacks of those various measurement techniques are presented and recommendations for different test purposes are provided. Various modern steels for car body applications have been intensively investigated by high strain rate tensile tests. Significant differences in the materials behaviour could be detected between mild steels and other HSS steel grades like dual phase steels, TRIP, and CP steels with regard to their strain rate and temperature sensitivity. Possible explanations based on microstructural features are discussed. The results indicate that yield and ultimate tensile strength increase with increasing strain rate. Low carbon mild steel show a strong increase in yield strength with decreasing temperature and increasing strain rate; this results in reduced strain hardening and finally in less uniform elongation. The strain rate sensitivity decreases sharply with increasing static tensile strength. CP steel grades show the lowest, DP and TRIP intermediate and DC04 the highest strain rate sensitivity values. Energy absorption values until 10% plastic strain show the superior energy absorption of CP900 steels. Until fracture, TRIP and austenitic steels show however the best energy absorption potential.
High strain rate tensile testing of modern car body steels
Hochgeschwindigkeitszugversuch zur Prüfung moderner Karosseriestähle
2005
8 Seiten, 9 Bilder, 5 Tabellen, 4 Quellen
Aufsatz (Konferenz)
Englisch
Zugprüfung , dynamische Prüfung , mechanische Eigenschaft , Aufprallenergieabsorptionsvermögen , hochfester Stahl , Feinblech , Dehngeschwindigkeitsempfindlichkeit , Verformungsgeschwindigkeit , TRIP-Stahl , Dualphasenstahl , Mehrphasenstahl , sehr kohlenstoffarmer Stahl , IF-Stahl , Gleichmaßdehnung , Bruchdehnung , Chromstahl
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