Abstract
A fracture modelling approach is developed to provide predictions in shell element simulations. MSSRT criterion is employed and combined with the modified BWH criterion in the fracture scaling framework to mitigate the mesh size sensitivity. Meanwhile, the effect of bending loads on the fracture prediction is considered by introducing the deformation mode indicator in the model. The predictive capability of the developed fracture model is evaluated by simulating penetration tests of the double hull structure. Reliable predictions of fracture initiation and propagation are yielded with varying mesh sizes. Typical failed elements in the double hull FE model are analyzed, with emphasis given on the evolution of damage for different through-thickness integration points. Based on this, the effects of bending loads on the fracture prediction are discussed in detail. It is demonstrated that the present fracture model can capture the fracture behavior of shell elements with sufficient engineering accuracy. This is especially relevant in the evaluation of ship impact analysis where limited knowledge of the material behavior is available. Although bending is not the dominated deformation mode in the double hull structure, the inclusion of the bending effects in the fracture model tends to provide more consistent prediction results.
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