Abstract
This study compared the experimental test results on punch-loaded unstiffened and stiffened panels with numerical predictions using different localized necking modeling approaches with shell elements. The analytical models that were derived by Bressan–Williams–Hill (BWH) were used in their original form and extended version, which considers non-proportional loading paths while using the forming-severity concept and bending-induced suppression of through-thickness necking. The results suggest that the mesh size sensitivity depends on the punch geometry. Moreover, the inclusion of bending effects and the use of the forming-severity concept in the BWH criterion yielded improved estimations of fracture initiation with shell elements.
Highlights
This study examined the influence of different numerical implementations of forming limit curve (FLC) on fracture predictions with shell elements in punch-loaded stiffened panel simulations
Note that the stress tensor components for a particular integration point are not set to zero, unless all other through-thickness integration points meet the necking condition. This approach was first proposed by Stoughton and Yoon [25], who showed that considering the stress distribution through the thickness of the sheet metal can aid in identifying the mode of failure, which is localized necking preceding fracture and fracture without localized necking
The predictions of the original BWH model and the proposed numerical implementation (BWH-E) were compared by simulating the unstiffened panels that were reported by Park and Choung [27] and laser-welded stiffened panel penetration tests reported by Kõrgesaar et al [28]
Summary
The assessment of a ship’s hull structure to withstand collision and stranding loads has traditionally been based on the application of a limit equivalent (effective) plastic strain in non-linear finite element analysis, without any explicit considerations of the structural processes, including through-thickness necking and associated ductile fracture. This approach, which is commonly coupled with mesh/element size-based scaling, has a certain accuracy when applied to predict plating rupture [1]. This study examined the influence of different numerical implementations of FLCs on fracture predictions with shell elements in punch-loaded stiffened panel simulations. The influence of the bending and loading history effects are discussed
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