Abnormal wave slamming impact of stiffened cylinders

Abstract

The structural response of a stiffened cylinder due to slamming impact is studied using the ALE method in LS-Dyna. The numerical modelling approach is in the first place verified against experimental results from unstiffened plate drop tests. Afterwards, structural responses of a stiffened cylinder are investigated by simulations with a range of impact speeds. The deformation mode, maximum deformation and slamming pressure from each impact is studied. Pressure impulses from impact simulations of both rigid and deformable structures are reapplied on the stiffened cylinder to reproduce the structural damage. The obtained deformations are compared with those from the coupled simulation. Important characteristics of the slamming loads are identified and discussed. The structural response due to a relevant design load is also investigated and compared against the coupled simulation.