Numerical simulation of the dynamic process of aero-engine blade-to-case rub-impact was conducted by explicit-implicit integration scheme.This took full account of low-frequency liner steady-state response and high-frequency nonliner time-transient response due to the rub-impact.By taking the structure of a certain high-pressure turbine as example

the process of blade-to-case rub-impact was simulated

and the dynamic response characteristic of the blade during the process was analyzed.The results show that

the stress wave

which affects the stress distribution of blade

will be generated and propagated on the body of blade during the process of rub-impact;after the process of rub-impact

the dynamic response of blade is a decaying harmonic motion at the damped low-order natural frequency.