| Citation: | ZHANG Haiyang, LI Xin, YU Duokui, et al. Investigation on strain rate-dependent mechanical model for TC6 titanium alloy[J]. Journal of Aerospace Power, 2025, 40（12）：20240072 doi: 10.13224/j.cnki.jasp.20240072
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To investigate the mechanical properties of TC6 titanium alloy, quasi-static and dynamic tests were conducted using an electronic universal testing machine, a high-speed tensile testing machine, and split Hopkinson tensile bar (SHTB) and split Hopkinson pressure bar (SHPB) apparatus. These tests yielded the true stress-strain curves and failure strains of the TC6 titanium alloy at various strain rates. The elastic mechanical behavior of the material was described using a linear elastic model. The plastic mechanical behavior was characterized by plastic stress-strain curves. Additionally, a competition model involving ductile fracture and shear failure was employed to describe the failure mechanical behavior. Based on test results, the stress-strain curves after necking, the ductile fracture parameters and shear failure parameters were determined using extrapolation prediction methods and numerical simulations. Low-velocity drop hammer impact tests and high-speed bird impact on blades tests were conducted, along with simulations of the test conditions using Pam-Crash software. By comparing the test and simulation results, the error in crack length for the drop hammer test was found to be 4.2%, while the maximum error in peak strain for the high-speed bird impact on blades tests was 14.9%. These results validated the effectiveness of the material mechanical model and its parameters.
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