Assessment of Hull Response due to Impact from Falling Object

摘要: The present study assesses ship hull response of a platform supply vessel due to impact from falling objects. This is carried out primarily by investigating the critical energy absorption and localised deformation penetration deck structure subjected container. made possible conducting contact simulations with nonlinear finite element solver Abaqus/Explicit., i.e. explicit time integration elemental equations motion use central difference method. Absorbed quantified integrating obtained resistance/contact force respect deformed distance/indentation. For simplicity container assumed infinitely rigid, kinetic solely absorbed deck. A comparison between two steel configurations (conventional building Hardox steel) investigate possibilities for improved strength, as this can decrease risk damage infliction liquefied natural gas fuel tank located beneath Det Norske Veritas rules standards application in accidental limit state design are reviewed particular interest recommended procedures dimensioning structural members withstand loads. principle shared dissipation colliding bodies presented analytically. Dimensioning load dropped object be determined, e.g. based on maximum capacity an eventual crane. Recommended further, analysis. variety simplified fracture models reviewed, specific their ability predict ductile failure metal alloys. Dependence stress triaxiality, plastic stress-strain relation, geometry size, strain rate investigated relation different models. Nonlinear material behaviour defined model, including true relations, dependence criteria. onset modelled introducing empirical length-related constant criterion definition conventional steel. Applications criteria were not discovered. led narrow one value fracture, specified parameters. Adjusting yield strength included Cowper-Symonds constitutive equation. Parameter variations coefficients clearly show large uncertainties estimated resistance force-indentation relation. Analytical methods estimation collapse crushing applied numerical results. Satisfying results found estimates provided concerning in-plane web girders. Although completely accurate, these provide physical understanding how increase girders increasing thickness. namely because moment quadratic dependent plate provides significantly increased penetration. However, degree should verified further simulations. Experiments scale compared analyses, aim discovering well suited specifying applicable