The　Gurson-Tvergaard-Needleman　(GTN)　model　has　provided　a　powerful　description　of　the　nucleation　growth　and　coalescence　of　micro　voids,　but　it　has　limitations　in　simulating　shear　fracture　due　to　the　absence　of　a　description　of　shear　localization　behavior.　A　shear　improvement　method　is　proposed　for　simulating　the　ductile　fracture　of　materials　under　different　stress　states.　The　modified　model　not　only　allows　for　strain　hardening　of　the　matrix　material,　but　also　accounts　for　the　stress　degradation　caused　by　shear.　The　strength　equation　of　the　material　is　described　by　both　the　shear　stress　state　function　and　a　decay　function,　making　it　easier　for　materials　under　shear　stress　state　to　experience　material　softening　and　further　inducing　shear　fracture.　The　modified　GTN　model　is　developed　by　incorporating　the　shear　stress　degradation　factor　into　the　yield　function,　while　taking　into　account　both　void　growth　and　shear　failure　mechanisms.　By　carefully　calibrating　the　model＇s　parameters,　the　deformation　and　fracture　processes　of　tensile,　plane　strain,　notch　tensile,　and　compression　specimens　in　the　7A52　aluminum　alloy　are　simulated.　The　damage　evolution　behavior　of　the　material　under　different　stress　states　is　analyzed.　The　results　indicate　that　the　damage　include　void　growth　mechanism　and　void　shear　mechanism.　The　proportions　of　these　two　mechanisms　vary　under　different　levels　of　stress　triaxiality.　Upon　localizing　material　deformation,　the　shear　stress　state　intensifies,　and　the　shear　damage　mechanism　assumes　a　critical　role　in　fracture.　The　modified　GTN　model　accurately　predicts　the　load-displacement　response　and　fracture　path　of　the　7A52　aluminum　alloy　under　a　wide　range　of　stress　states.