Research on sheet metal semicutting process using coupled and uncoupled damage model

摘要

An axisymmetric finite element model was created using ABAQUS software to study the evolutionnof the ductile damage in the process of sheet metal semicutting. A modified Gurson–Tvergaard–nNeedleman (GTN) porous material model and a modified Rice–Tracey ductile fracture modelnwhich takes into account the influence of stress triaxiality and deviatoric stress tensor on materialndamage, were introduced and the improvements of them were verified based on a single elementnuniaxial tension test and different tensile tests with notched specimens. After that, both of themnwere used for elastoplastic sheet metal semicutting analysis. By analysing the distributions ofnhydrostatic stress, equivalent stress, equivalent strain, stress triaxiality and fracture of sheet metalnin the process of semicutting parts based on simulation and the corresponding experimentalnresults, some phenomenon related to void nucleation, growth and coalescence in the sheet metalnsemicutting process was discussed.