Research on M-Paul Dynamic Constitutive Relation of Q235B Steel

Abstract

In recent years, terrorist attacks and regional conflicts have increased and research on the resistance of building structures has beenmorehighlighted.Q235Bisacommonlyusedsteeltypeinbuildingstructures,andthereisanurgentneedforresearchonits dynamicmaterialproperties.Inthispaper,PaulconstitutivemodelwascalibratedbasedonthematerialpropertiesofQ235Bsteel. Basedontheobtainedresults,itwasfoundthattheoriginalmodelwasnotabletotakeintoaccounttemperature-softeningeffect. Therefore,atemperature-softeningparameterwasaddedintothetemperaturetermoftheoriginalPaulmodel,andthemodified M-Paulconstitutivemodelwasdeveloped.Then,numericalpredictionresultsobtainedfromQ235Bsteelpenetrationexperiments using J-C (Johnson–Cook) and M-Paul constitutive models were compared. It was observed that J-C constitutive model significantly overestimated ballistic limit while estimations obtained from M-Paul constitutive model were closer to experimental results.ThisobservationverifiedthecorrectnessandeffectivenessofM-Paulmodelandestablishedasolidfoundationforrelevant research works on the impact resistance of building structures.