Application of thru-Nakajima model to predict formability of steel sheet with different thickness
The thru-Nakajima model was created in AutoForm,and the properties of steel plate were loaded into the model and simulated,the variation trend of maximum failure value with the increase of plate thickness was analyzed.The results showed that the maximum failure value of most materials decreases with the increase of thickness,but there are three different case:①The maximum failure value of conventional deep-drawing steel is low at 0.8 mm and 1.6 mm thickness,and is highest at 1.2 mm thickness when the steel is subjected to equal biaxial stretching,general bulging and plane strain,such as DC06;②The maximum failure value of special deep-drawing steel is high when it is 0.8 mm thickness,and when it is equal biaxial stretching and biaxial stretch-ing bulging,the value is unchanged when it is 0.8 mm and 1.2 mm thickness,such as DC57D+Z steel;③When the yield strength of high carbon alloy steel is 280～400 MPa,the variation trend of the maximum failure value is diversity,such as HC340LA,for plane strain,similar uniaxial stretch-ing or tension-compression deformation,the value decreases with the increase of thickness,while for other deformation types,the value decreases first and then increases with the increase of thick-ness,among which the value is the highest at 0.8 mm thickness and the lowest at 1.2 mm thickness.When the galvanized sheet HC340-590DPD-Z is subjected to biaxial stretching deformation,the maximum failure value gradually decreases with the increase of thickness,and the value is highest when the thickness is 1.2 mm for plane strain and near uniaxial stretching deformation.The maxi-mum failure value of HC340-590DP steel plate decreases first and then increases with thickness in all types of deformation,and the value is the lowest when the thickness is 1.2 mm.④When the ul-tra-high strength steel is subjected to biaxial stretching deformation,the maximum failure value of 1.2 mm thickness is the highest,the value of 0.8 mm and 1.2 mm thickness are close and low for the deformation with large secondary strain,such as HC420-780DPD-Z,while for non-galvanized plate HC420-780DP,the value decreases with the increase of thickness.
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