Abstract:

 Based on the Oxley slip-line theory, two-dimensional orthogonal cutting experiments in conjunction with an analyticalbased computer code were used to determine Johnson-Cook flow stress data of aluminum alloy 7050-T7451 in metal cutting. The strain range was 0.61～1.12, the strain rate range was 10263～69941, and the temperature range was 95～248,which were covered by the model. In order to verify the flow stress model, cutting experiments were done in the same cutting parameter range used in determining the flow stress. By comparing the results obtained by experiments and FEM using the flow stress model as input, the maximum error between cutting forces simulated obtained by FEM and obtained by experiments were less than 15％, and the maximum error of temperature was less than 11％.

Key words:  flow stress, cutting methods, inverse analysis, aluminum alloy 7050-T7451, finite element method