The complete stress-strain relationship is needed for nonlinear finite element simulation of ship collisions and other events with plastic deformations, whereas only the material grade is known in the design phase. The analyst has to rely on minimum requirements to material strength found in class rules and statistical distributions of the material parameters. This paper investigates the effect of various features of the complete stress-strain curve on the predicted outcome of a collision simulation. This is discussed on the basis of published literature, and the effect of the assumed stress-strain curve is determined through nonlinear finite element analysis (NLFEA) simulations of a full-scale impact scenario. The influence of strain-rate effects is investigated. The findings reveal that the slope of the stress-strain curve determines how strains localise, and thereby when and where fracture propagates. The slope is strongly dependent on the yield ratio, yield plateau and the elongation to fracture, parameters that have significant statistical variation within a material grade. Some challenges related to simulation of strain-rate effects are also discussed.


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    Title :

    On the sensitivity to work hardening and strain-rate effects in nonlinear FEM analysis of ship collisions


    Contributors:

    Published in:

    Publication date :

    2017




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    50.92 / 50.92 Meerestechnik / 55.40 / 55.40 Schiffstechnik, Schiffbau




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