Journal ArticleDOI
Practical techniques for finite element modeling to simulate structural crashworthiness in ship collisions and grounding (Part I: Theory)
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In this article, the authors developed practical techniques useful for FE modeling to simulate structural crashworthiness of ships in collisions or grounding, which can be applied to existing test structural models, which involve both crushing and fracture behavior, are shown by a comparison with the experimental results and corresponding FE simulations to confirm the validity of the proposed methods.Abstract:
The aim of this paper is to develop practical techniques useful for FE modeling to simulate structural crashworthiness of ships in collisions or grounding. Approaches to define relevant FE mesh size, material stress'strain relationship, and critical fracture strain and also to deal with the dynamic effects related to dynamic yield strength, dynamic fracture strain, inertia, and frictions are addressed so that the crushing and rupture behavior in collisions and grounding can be analyzed efficiently and accurately in the FE simulations. Benchmark studies on material tensile coupon test specimen and a perforated plate under axial tension are undertaken for the simulation of the fracture behavior. In a separate paper, applications on the existing test structural models, which involve both crushing and fracture behavior, are shown by a comparison with the experimental results and the corresponding FE simulations to confirm the validity of the proposed methods.read more
Citations
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Journal ArticleDOI
Review and application of ship collision and grounding analysis procedures
TL;DR: A probabilistic procedure for which prediction and analysis tools for collision and grounding analyses can be used by the maritime industry to develop performance based rules to reduce the risk associated with human, environmental and economic costs of collision and grounded events is outlined.
Journal ArticleDOI
On the failure criterion of aluminum and steel plates subjected to low-velocity impact by a spherical indenter
TL;DR: In this paper, an analytical failure criterion is proposed to characterise ship plated structures manufactured with aluminum or steel materials subjected to low impact velocities, and the criterion considers the critical deflection, force and absorbed energy of plates laterally impacted by a hemispherical indenter, and assumes that failure occurs at the presence of necking.
Journal ArticleDOI
Strain and stress relation until fracture for finite element simulations of a thin circular plate
TL;DR: In this paper, a true strain and stress relation for mild steel was obtained from a series of tensile experiments with specimens of different length-per-breadth ratios and used to simulate a plate punching experiment until fracture with the finite element method.
Journal ArticleDOI
Strain and stress relation for non-linear finite element simulations
Sören Ehlers,Petri Varsta +1 more
TL;DR: In this article, the authors present a procedure to determine an element-length dependent strain and stress relation until fracture that is suitable for implementation in finite element models. But this procedure is not suitable for non-linear numerical simulations.
Journal ArticleDOI
The influence of the material relation on the accuracy of collision simulations
TL;DR: In this paper, the influence of the material relation on the accuracy of numerical results is not presented in detail in the present literature even though different material relations are used, and this comparison can support the future use of an appropriate material relation for collision simulations.
References
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Journal ArticleDOI
On the Crushing Mechanics of Thin-Walled Structures
Tomasz Wierzbicki,W. Abramowicz +1 more
ReportDOI
Strain-hardening and strain-rate effects in the impact loading of cantilever beams
G R Cowper,P S Symonds +1 more
Book
Ultimate limit state design of steel-plated structures
TL;DR: In this article, the authors present a semi-analytical method for the Elastic Plastic Large deflection Analysis of Plates under combined loading, and the Idealized Structural Unit Method is used for the analysis.
Journal ArticleDOI
Experimental and Theoretical Investigation of the Plastic Deformation of Cantilever Beams Subjected to Impulsive Loading
S. R. Bodner,Paul S. Symonds +1 more
Journal ArticleDOI
Inertia effects in axisymmetrically deformed cylindrical shells under axial impact
TL;DR: In this article, the axisymmetric buckling of elastic-plastic cylindrical shells subjected to axial impact is studied using a finite element analysis, which reveals that shells are both velocity and mass sensitive, so that larger energies can be absorbed by a shell for high-velocity impacts when decreasing the striking mass.
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