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    Item type:Publication, Access status: without files ,
    Experimental investigation of an accidental ice impact on an aluminium high speed craft
    (2017-05)
    Herrnring, Hauke
    ;
    Kubiczek, Jan Manuel
    ;
    Ehlers, Sören
    ;
    Niclasen, N. O.
    ;
    Burmann, M.
    High speed vessels are constructed according to the high speed craft codes. These codes enable very light ship structures, which are necessary for effective operation of fast vessels without taking ice loads into account. In the given case a conventional aluminium structure of a high speed ferry designed according to the DNV-GL HSLC code for an operation in Stockholm is investigated. For the determination of the consequences of an impact between a high speed craft and a single ice floe an analytical impact model and a series of drop tests with conical ice specimens against full-scale aluminium panels of the given vessel are presented. Plastic deformations are only observed at the stiffeners and the outer shell. The structural integrity is still given after the tests. The influence of the structural stiffness as well as the limited change in the maximum force at different energy levels during the impact is discussed.
    Publicationtype: Conference Paper
      115
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    Item type:Publication, Access status: without files ,
    Material relationship identification for finite element analysis at intermediate strain rates using optical measurements
    (2017-05)
    Kubiczek, Jan Manuel
    ;
    Burchard, Kim S.
    ;
    Ehlers, Sören
    ;
    Schöttelndreyer, Martin
    Accidental events, the interaction with ice as well as, in case of navy, detonations can lead to plastic deformations including fracture of ship structures. For the finite element analysis of such events, a suitable description for the material relationship is required. Therefore, this paper presents a procedure to obtain the effective stress-strain material relationship at intermediate strain rates. The corresponding uniaxial tensile tests are carried out at different speeds in order to investigate strain-rate effects. Since mechanical extensometers are not suitable for high speed tensile testing a high speed optical strain measurement system and a corresponding evaluation routine in MATLAB are developed. Two measuring marks are applied on the specimen and optically traced by a high speed camera. Based on the result of these measurements, a novel approach to determine effective stress-strain relations for the implementation into finite element models is proposed and compared with current approaches.
    Publicationtype: Conference Paper
      164