冲击载荷下金属薄壁圆柱壳动态响应特性研究

To investigate the dynamic mechanical response characteristics, failure modes, and energy absorption characteristics of thin-walled metal structures under impact loading, the cylindrical shells were impacted by dropping hammer at different velocities. The deformation modes and the axial shortening rates of cylindrical shells with different materials under the same impact conditions were obtained. The effects to energy absorption and axial shortening rates of impact velocity and ratio of diameter to thickness were also analyzed. The results show that the axial shortening rate of thin-walled cylindrical shells increases with the increase of impact velocity and ratio of diameter to thickness. The energy absorption capacity increases with the increase of impact velocity due to strain rate effect. The average post-buckling load under dynamic impact condition is much larger than the theoretical load under quasi-static condition, which is related not only to the diameter, thickness and material properties of shells, but also to the impact velocity. To absorb the impact energy of the A6060 aluminum alloy through non-axisymmetric buckling and folding deformation applies to thin-walled structural parts.