Finite element simulations of ship collisions: a coupled approach to external dynamics and inner mechanics

Pill, Ingmar; Tabri, Kristjan

doi:10.1080/17445302.2010.509585

Cited by 35 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, the accuracy of the force versus penetration curves is believed to be very good due to the high accuracy achieved with the employed material model including failure; see [13]. In the future, this can further be strengthened with a full three-dimensional coupled numerical simulation according to [7] as applied by [17] for large-scale collision experiments.…”

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

A combined numerical and semi-analytical collision damage assessment procedure

Ehlers

Tabri

2012

Marine Structures

Self Cite

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 95%

“…External dynamics primarily evaluate the ship motions under the action of external forces; see for example [4,5] for time domain simulations and [6,7] for finite element-based simulations. However, the external dynamics requires input from the internal mechanics to evaluate the magnitude of the contact force and the extent of deformation.…”

Section: Introductionmentioning

confidence: 99%

A combined numerical and semi-analytical collision damage assessment procedure

Ehlers

Tabri

2012

Marine Structures

Self Cite

View full text Add to dashboard Cite

“…The non-linear plate material behaviour is considered using an element length-dependent material relationship including failure according to Ehlers and Varsta (2009). The collision simulation is carried out in a dynamic fashion considering the motions of the colliding vessels as described in Pill and Tabri (2009). The importance of these fully dynamic simulations will be presented through a comparison with a series of quasi-static collision simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation on the collision resistance of the X-core structure

Ehlers

Tabri

Romanoff

et al. 2012

Ships and Offshore Structures

Self Cite

View full text Add to dashboard Cite

This paper analyses the collision resistance of the X-core structure. The analysis includes a detailed investigation of the non-linear plate and laser weld material behaviour using optical, full-field strain measurements. The resulting material relationships are implemented into the finite element model. Furthermore, the finite element model includes the influence of the ship motions to accurately predict the collision resistance. The verification of the numerical results is done by a comparison of the experimental and numerical force versus penetration curves and by a comparison of the deformed geometries. The latter is achieved through a digitised three-dimensional model of the post-experimental X-core structure. As a result, the accuracy of the collision simulations is presented and discussed.

show abstract

“…A few researchers also assume constant added masses in coupled approaches, such as Pill and Tabri (2011) and Yu and Amdahl (2016a). The assumption of using constant added masses in coupled methods has been discussed also by the authors in Yu et al (2016) and Yu and Amdahl (2016a), in which both 3DOF (surge, sway and yaw) and 6DOF coupled collision analysis was carried out with constant added masses and the results were compared with predictions by SIMO.…”

Section: Effect Of Forward Speed On Added Mass and Damping Coefficientsmentioning

confidence: 99%

“…Pill and Tabri (2011) used the planar joint in LS-DYNA to give constant added masses for motions in the horizontal plane. Yu et al (2016) employed the user defined load subroutine in LS-DYNA to implement a steady state maneuvering model to represent the hydrodynamic forces in the planar 3DOF.…”

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

View full text Add to dashboard Cite

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.

show abstract

Finite element simulations of ship collisions: a coupled approach to external dynamics and inner mechanics

Cited by 35 publications

References 5 publications

A combined numerical and semi-analytical collision damage assessment procedure

A combined numerical and semi-analytical collision damage assessment procedure

Numerical and experimental investigation on the collision resistance of the X-core structure

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

Contact Info

Product

Resources

About