TC6 钛合金的率相关力学模型研究

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，ductile fracture parameters，and shear failure parameters are determined using extrapolation prediction methods and numerical simulations. Low-velocity drop hammer impact tests and high-speed bird impact on blades tests were performed. The test conditions were simulated using Pam-Crash software，and the validity of the material mechanical model and its parameters was verified by comparing test and simulation results.