GH4169 super alloy was tested using high temperature split Hopkinson pressure bar (SHPB) technique. The temperature sensitivity of the material under high strain rates was obtained and the parameters of Johnson-Cook constitutive model were fitted. A semi-empirical model was established to describe the distribution of stress

strain and temperature inside the specimen during compression based on the numerical calculation method. Then a new method for correcting the constitutive parameters was put forward to decouple the interfacial friction effect and adiabatic deformation from the result of SHPB experiment. The experimental results showed that the yield strength and flow stress of GH4169 super alloy decreased with the increase of temperature. And it was confirmed that adiabatic deformation and interfacial friction effect obviously affected the accuracy of SHPB experiment

thus the results can not reflect the work hardening properties of the material. After multiplying the hardening term by the correction factor of 1.2

the modified constitutive parameters accurately reflected the stress-strain characteristics of the material under high strain rates.