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Shiyuan Luo,Yongxin Jiang,Sandrine Thuillier,Philippe Castany,Liangcai Zeng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
A simplified 3D FE model based on McCormick’s model is developed to numerically predict the spatiotemporal behaviorsof the PLC effect in Ti-12Mo alloy tensile tests at 350 °C with strain rates from the order of 10–4 s−1 to 10–2 s−1. The materialparameter identification procedure is firstly presented in details, and the simulated results are highly consistent withexperimental ones, especially in terms of stress drop magnitudes and PLC band widths. The distribution of simulated stressdrop magnitudes at a constant tensile velocity (0.01 mm/s) follows a normal distribution and its peak value is in the range of26–28 MPa. Furthermore, the simulated band width slightly fluctuates with the increase of true strain and its average valueis about 1.5 mm. Besides, the staircase behavior of strain–time curves and the hopping propagation of the PLC band areobserved in Ti-12Mo alloy tensile process, which are related to the strain localization and stress drop magnitudes.