The elastic and inelastic behavior of two types of high strength steel alloys, BH340 and DP590, during loading and unloading under proportional biaxial stress ratios sigmax : sigmay = 1:0, 1:2, 1:1, 2:1 and 0:1 is investigated. Each as-received material was initially given an equivalent plastic strain of epsilon0 approximately 0.02 and unloaded. Subsequently the materials were aged under 170 deg C for 20 minutes in an oil bath. The effect of bake-hardening on the subsequent elastic and plastic deformation behavior of the materials was investigated. The increase in yield strength due to bake-hardening, the tangent modulus, d sigma / d epsilon, of the stress-strain curve during unloading and the amount of inelastic strain recovery are precisely measured. In case of biaxial tension the subsequent elastic moduli after prestraining and bake-hardening were lower than those measured for as-received state, while no significant difference was observed for the uniaxial case. Furthermore, it is found that bake-hardening does not affect the behavior of d sigma / d epsilon during unloading and the amount of inelastic strain recovery. The bake-hardenability index of DP590 is found to be higher for biaxial tensile stress states than for uniaxial one.
Elastic and inelastic behavior of high strength steel alloys after prestraining and bake-hardening under biaxial loading and unloading
Elastisches und inelastisches Verhalten von hochfesten Stählen nach einer Vorverformung und dem Bake-Hardening (Einbrennen der Lackierung) unter biaxialer Be- und Entlastung
2009
4 Seiten, 5 Bilder, 2 Tabellen, 13 Quellen
Aufsatz (Konferenz)
Englisch
Anwendung im Fahrzeugbau , Bake-Hardening-Stahl , biaxiale Beanspruchung , Dualphasenstahl , Elastizität , Elastizitätsmodul , hochfester Stahl , Inelastizität , Kaltverfestigung , mechanische Eigenschaft , mechanische Vorspannung , Modul (Materialkonstante) , plastische Anisotropie , Spannungs-Dehnungs-Verhalten
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