Rational Design of Light-Weight Structures against Accidental Loads

  • Urban, Jesper (Project Manager)

    Project Details

    Description

    Shipbuilding has reached a stage where it is possible to design highly optimized structures that efficiently resist the loads from the sea. The use of more advanced materials has expanded dramatically over the past decade. Materials such as aluminium or composites have a significant different material behavior compared to conventional steel and new models have to be developed. Existing analytical models developed for mild steel structures do not apply on aluminium structures as the crushing response of aluminium structures is dominated by fracture and as aluminium has a different material behaviour compared to mild steel. Crushing of aluminium structures is studied with the use of LS-DYNA, a commercial, non-linear, explicit finite-element code, and exiting fracture criteria for metals are implemented in order to predict fracture during crushing. The numerical simulations are compared with experiments on X- and T-element of aluminium, performed at DTU.
    New simple analytical models, describing the crushing behaviour of typical structural elements of a ship-structure, are developed based on experiments and numerical simulations. Another related research area is the crushing of sandwich structures. A sandwich construction is for sure a competing building component compared to aluminium because of the flexibility, high stiffness and strength. The FE-models include the skin modelled with shell-elements and the core modelled with solid elements.. The failure of each ply is controlled by a failure criterion such as Tsai-Wu, Hoffman, Tsai-Hill, Hashin-Rotem and Chang-Chang. Delamination between the skin and core is treated with a contact surface that ties the core surface nodes to the skin shell. The aim of the project is finally to be able calculate the crushing response of a sandwich-bow during a collision.
    StatusFinished
    Effective start/end date01/01/200031/12/2003

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