A study on the dynamic shock performance of 7055-T6I4 aluminum alloy based on experimental and simulation

In order to fill up the deficiency of dynamic impact characteristics and damage mechanism of 7055 aluminum alloy. Johnson-Cook constitutive equation and damage model for 7055 aluminum alloy was established. Dynamic impact performance is studied using experimental and simulation methods. Results show that: Under 120 degrees C, the microstructure of the alloy changed notably after dynamic shock, the number density of eta' precipitated phases reduced appreciably as the shock strain rate increased; Under 220 degrees C, the number density of the eta' precipitated phases in the testpiece reduced significantly after shock when the strain rate of dynamic shock was 6000s-1; Under 220 degrees C, as the shock strain rate increased, almost all the eta' precipitated phases turned into a eta' phase incoherent to the aluminum matrix. At the same time and velocity, the stress after dynamic shock is the largest when the dynamic temperature is 220 degrees C; when the ambient temperature is 120 degrees C, the stress after dynamic shock is the smallest, and the stress after dynamic shock at 220 degrees C is twice as big as that at 120 degrees C.