Dynamic tests and bird impact dynamic response analysis for a 2024-T3 aluminum alloy plate

Stress-strain curves at quasi-static and high strain rates of 2024-T3 aluminum alloy were measured using dynamic tensile tests with an electronic universal testing machine and a split Hopkinson tensile bar (SHTB). The constitutive model of this aluminum alloy was described with Johnson-Cook model reflecting the material hardening effect the strain rate strengthening effect. 4 parameters in Johnson-Cook equation were obtained by using stress-strain curves fitting at different strain rates. By combining the smooth particle hydrodynamics (SPH) method and the finite element (FE) method, and using Johnson-Cook equation of 2024-T3 aluminum alloy, the numerical model of bird impact on a 2024-T3 aluminum alloy square plate was established with the transient dynamic software PAM-CRASH. Dynamic responses of the plate with numerical calculation agreed well with the test results of bird impact. It was shown that the numerical calculation model is reasonable and reliable. The whole analysis process including material dynamic tests, numerical calculation and bird impact tests provided a reference for anti-bird impact design and analysis of aircraft structures.