Modeling and Simulation of Ice Floe/Ship Structure Collision with Inelastic Structural Deformation, Ice Crushing, and Ice Flexural Fracture
Abstract
This report documents a series of numerical simulations of ice slab impact on notional naval surface ship hull structure. These simulations exploit modeling methods for ice crushing and flexural fracture, and they demonstrate the shared-energy collision mechanics regime where local structural damage extent may be dependent on and limited by ice slab failure. Inelastic material behavior and development of permanent set deformation is allowed in the impacted hull structure. For the range of parameters considered, ice flexural failure does not consistently limit structural permanent set damage, even for relatively thin ice slabs. For this reason, reliance on a flexural limit for limiting ice impact loading on relatively wall-sided non-ice-classed hulls is not recommended. Structural modeling methods are refined to minimize the influence of structural vibration responses that are artifacts of imposed relative structure/ice movement and structural boundary conditions, and a method for simulating repeated ice impacts is developed. Repeated ice slab impacts inflict cumulative structural damage, but permanent set strain increments generally decrease with repeated loadings.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2019
- Accession Number
- AD1070800
Entities
People
- Douglas E. Lesar
Organizations
- Naval Surface Warfare Center Carderock Division