Repeated bending forming characteristics and deformation damage of 2195 Al-Li alloy sheet based on GTN model
The commercial 2195-T6 Al-Li alloy sheet was selected as the research object,and the true stress-true strain curves were ob-tained by means of unidirectional tensile tests.On this basis,the GTN model of forming damage and the numerical simulation model of re-peated bending forming of 2195 Al-Li alloy were established.Based on the numerical simulation model,the influence of bending times and compression amount on springback and damage characteristics of sheet was studied in the repeated bending forming process.The influence of repeated bending on springback was verified by test.The results show that in the single bending deformation,the plastic bending de-formation zone gradually increases with the increase of bending compression amount;when the compression amount is greater than the critical value,the springback amount decreases with the increase of compression amount.Under the same compression amount,with the increase of bending times,the plastic deformation zone of the sheet increases gradually,and the springback amount decreases gradually.However,with the increase of bending times,the damage of the sheet gradually increases.Therefore,it is necessary to control the internal damage of the sheet within the permissible range to suppress bending springback through repeated bending forming.
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