Anti-buckling design of cylindrical shells by local surface nanocrystallization

Abstract

A novel surface modification method, namely the surface nanocrystallization technology, is introduced to enhance the anti–buckling performance of the metal cylindrical shells under axial impact loading. The effects of local nanocrystallization layouts are explored by evaluating the critical buckling loads of four local nanocrystallization layouts including the local circumferential stripes (LCS), local axial stripes (LAS), spaced latticed blocks (SLB) and oblique latticed blocks (OLB). Numercial results show that, compared to the untreated cylindrical shells, the critical buckling loads of the local nanocrystallized ones are significantly improved by the local nanocrystallization treatment. The critical buckling loads for the LAS design is improved by 80%. It is concluded that the local nanocrystallization treatment is a very promising method to design and manufacture the metal cylindrical shells with high anti-buckling performance.