Practical techniques for finite element modeling to simulate structural crashworthiness in ship collisions and grounding (Part I: Theory)

Paik, Jeom Kee

doi:10.1533/saos.2006.0148

Cited by 119 publications

(56 citation statements)

References 16 publications

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“…Cowper-Symonds that is most widely used in the naval architecture and offshore engineering fields [2][3][4][5]. The Cowper-Symons [57] have been proposed the coefficients for mild steel, [58] have been suggested the coefficient for high-tensile steel, C=3200, q= 5, respectively.…”

Section: Effects Of Strain Ratementioning

confidence: 99%

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An experimental and numerical study on nonlinear impact responses of steel-plated structures in an Arctic environment

Kim

Lee

Park

et al. 2016

International Journal of Impact Engineering

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Ships and offshore platforms that operate in Arctic regions at low temperatures are likely subjected to impact loads that arise from collisions with icebergs. The aim of this paper was to examine the nonlinear impact response of steel-plated structures in an Arctic environment. In addition to material tensile tests for characterisation of the mechanical properties of polar-class high-tensile steel of grade DH36, an experimental study was undertaken in a dropped-object test facility on steel-plated structure models under impact loads and at low temperatures equivalent to those in Arctic regions. LS-DYNA nonlinear finite element computations were also performed for the corresponding test models. We conclude that nonlinear finite element analyses are useful in the analysis of the nonlinear impact structural responses involving yielding, crushing and brittle fractures at low temperatures as long as the modelling techniques are adequate. The conclusions and insights developed in this paper should be useful in the safety design of ships and offshore platforms intended for operation in Arctic regions.

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Section: Effects Of Strain Ratementioning

confidence: 99%

“…Furthermore, even though the fracture strains were obtained from experiments, the values could not directly be applied in the FE analysis. To consider the fracture strain in FEA, the critical fracture strain was used as a function of the element size, namely [4] Fig.15. These results are summarised in Table 5.…”

Section: Fracture Criterionmentioning

confidence: 99%

An experimental and numerical study on nonlinear impact responses of steel-plated structures in an Arctic environment

Kim

Lee

Park

et al. 2016

International Journal of Impact Engineering

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“…This is known as Barba's relationship of fracture strain versus length scale, and the formulation used here was proposed by Yamada et al (2005); see also Paik (2007) who presents important practical techniques for FE modelling to simulate among others ship collision and grounding:…”

Section: Uniaxial Tensile Testsmentioning

confidence: 99%

Characteristics of material, ship side structure response and ship survivability in ship collisions

Ringsberg

2010

Ships and Offshore Structures

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Research on ship collision and grounding has taken giant steps during the last decade. One reason is that computer capacity has increased and, therefore, also the possibility to simulate various collision scenarios in a realistic way using more advanced and larger models. As a result, it has been possible to investigate in more detail the understanding of structural integrity, characteristics and failure phenomena that interact during, for example, a collision. This article summarises research experiences from a research group that has been working with ship collision safety, using both experiments and numerical simulations by finite element (FE) analysis. Results are presented from tensile and forming limit tests, followed by FE analyses of these with the objective of predicting material rupture using appropriate constitutive material models and damage criteria. An example of an innovative design of a side-shell structure that is considered to be more intrusion-tolerant than most side-shell structures used today is demonstrated. Finally, results from a research project which has a holistic approach on the assessment of survivability of a struck ship are presented. In the project, a methodology has been developed which combines structural analysis and damage stability analysis followed by risk analysis.

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“…This requires good expertise and engineering judegement. Recommendations of numerical setups for ship collision simulations can be found in Storheim (2016), Sajdak and Brown (2005) and Paik (2007a). …”

Section: Introductionmentioning

confidence: 99%

Implementation of Linear Potential-Flow Theory in the 6DOF Coupled Simulation of Ship Collision and Grounding Accidents

Zhang

Shen

Amdahl

et al. 2016

Journal of Ship Research

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Ship collisions and groundings are highly nonlinear and transient, coupled dynamic processes involving large structural deformations and fluid structure interactions. It has long been difficult to include all effects in one simulation. By taking advantage of the user defined load subroutine and the user common subroutine, this paper implements a model of hydrodynamic loads based on linear potential-flow theory into the nonlinear finite element code LS-DYNA, facilitating a fully coupled six degrees of freedom (6DOF) dynamic simulation of ship collision and grounding accidents. Potential-flow theory both with and without considering the forward speed effect is implemented for studying the speed influence. With the proposed model, transient effects of the fluid, global ship motions, impact forces and structural damage can all be predicted with high accuracy. To the authors' knowledge, this is the first time the fully coupled 6DOF collision and grounding simulations are carried out with linear hydrodynamic loads for transient conditions but without simplification of collision forces.The proposed method is applied to calculations of an offshore supply vessel colliding with a rigid plate and with a submersible platform. The results are compared with a decoupled method and discussed with emphasis on the influence of different initial velocities. The proposed method is capable of predicting both the 6DOF ship motions and structural damage simultaneously with good efficiency and accuracy; hence, it will be a very promising tool in the application to ship collision and grounding analysis.

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Practical techniques for finite element modeling to simulate structural crashworthiness in ship collisions and grounding (Part I: Theory)

Cited by 119 publications

References 16 publications

An experimental and numerical study on nonlinear impact responses of steel-plated structures in an Arctic environment

An experimental and numerical study on nonlinear impact responses of steel-plated structures in an Arctic environment

Characteristics of material, ship side structure response and ship survivability in ship collisions

Implementation of Linear Potential-Flow Theory in the 6DOF Coupled Simulation of Ship Collision and Grounding Accidents

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