Non-linear FEA Simulate Ship Stranding

Ship stranding is taking place more and more all round the world with increasing severity. According to official statistics, ship stranding dominates crude oil leaking accidents, causing most crude oil leak and tremendous property loss and environmental damage. Every ship stranding accident gives rise to greater concern from the authorities and the public. It is extremely necessary to conduct ship stranding related research to reduce economic loss.Great shift and deformation of hull structure will take place during the dynamic process of ship stranding and colliding, so ship stranding takes on multi-non-linear feature. Given multiple uncertainties involved into the stranding process, it is impossible to build a precise mathematical module to figure out a thorough solution based on complete analysis. After years of practical research, non-linear FEA(Finite Element Analysis) simulation has become by far the most effective research method of ship stranding.Based upon previous research by other scholars, this article targets the critical technology of ship stranding computerized simulation. On condition of keeping both high simulation precision and calculating efficiency, we made computerized simulation of two work conditions, which are different parts of the hull bottom of a product carrier with full capacity of 16,000 displacement ton strand on pointed top reef and round top reef. The conclusion of this simulation provides valuable reference for ship stranding research and hull structure design.This article includes the following parts:1 An introduction of the present condition of ship stranding research, the definition and classification of ship stranding, the research trend both at home and abroad on ship stranding and colliding;2 An discussion of the external dynamic module of ship stranding, providing reference for module simplification and conditions determination; 3 An introduction of the fundamental theory and major calculation method of non-linear FEA of great dynamic deformation, and an discussion of the reliability of non-linear FEA of ship stranding;4 How to build a FEA simulation based upon ANSYS/LS-DYNA;5 Simulated calculation of two work conditions have been made. Response charts and time-results curve of different parts of the hull bottom were drawn. Based upon comparison and analysis of these results, a better design of hull bottom to reduce hull damage by stranding and colliding has been made, which is a very valuable reference for future related research.