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Open Engineering

formerly Central European Journal of Engineering

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Rapid prediction of damage on a struck ship accounting for side impact scenario models

Aditya Rio Prabowo
  • Corresponding author
  • Interdisciplinary Program of Marine Convergence Design, Pukyong National University, Busan, South Korea
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Dong Myung Bae
  • Department of Naval Architecture and Marine Systems Engineering, Pukyong National University, Busan, South Korea
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Jung Min Sohn
  • Department of Naval Architecture and Marine Systems Engineering, Pukyong National University, Busan, South Korea
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ahmad Fauzan Zakki / Bo Cao
Published Online: 2017-04-22 | DOI: https://doi.org/10.1515/eng-2017-0014

Abstract

The impact phenomenon is inseparable part of every physical things, from substantial particle until macrostructure namely ship. In ship collisions, short-period load is distributed during impact process from striking ship into struck ship. The kinetic energy that is used to move striking ship is absorbed by struck ship that makes its structure undergoes plastic deformation and failure. This paper presents study that focuses on predicting occurred damage on side hull of struck ship for various impact scenario models. These scenarios are calculated by finite element approach to obtain characteristic on damage, energy as well as load during and after impact processes. The results indicate that the damages on impact to longitudinal components such as main and car decks are smaller than impact to transverse structure components. The damage and deformation are widely distributed to almost side structures including inner structure. The width between outer and inner shells is very affecting the damage mode where the width below the two meters will make inner shell experience damage beyond plastic deformation. The contribution of structure components is proofed deliver significant effect to damage mode and material strengths clearly affect the results in energy and load characteristic.

This article offers supplementary material which is provided at the end of the article.

Keywords: Structural damage; impact scenario model; finite element approach; damage mode; structure component; material characteristic

1 Introduction

Contact between entities in this world is basic concept in social and humanity as well as science in engineering. In marine and ocean engineering filed, contact can be used to perform something useful such as marine steel plate roll and treatment. In other hand, contact also can become something remarkable with immense loss, i.e. grounding and collision. This contact type is called impact which occurs in short-time period and usually happens during accident phenomenon. Impact in accident especially in this field is very wide subject that need to be observed. The objectives of this observation are indeed diverse, including to improve the structure safety, develop appended material etc. The endless possibilities and causes are directly influencing the results mode which can be in term of energy, load and even damage extent. This situation makes this impact phenomenon in ocean engineering and marine structures is continuously studied. Various researchers in the past had performed studies in impact phenomenon including ship collision by several methods. The researches in analytical theory had been introduced by Minorsky [1] with his empirical formula to estimate the collision energy in term of high-energy collision. As the rapid improvement on technology, virtual experiment can be deployed to solve various structure problems such as collision between ships with ease in these days as it was used by Bae et al. [2] to perform rapid prediction of structural response accounting for collision. The inner effect of ship structures in collision phenomenon can be divided into two major classifications, namely structure and material. These parameters are certainly producing different output during and after collision processes.

This paper presents the study on ship collision based on various impact scenarios models. The scenario models are built based on two classifications of inner effect in collision event such as structure and material. Preference of structure component accounting for the striking ship direction namely deck structure as longitudinal component and side hull shell as transverse component will represent analyses in term of structure. The various material effect such as mechanical strength, hardening and failure strain are used as representative of material aspect. Virtual experiment will be performed in order to acquire results of impact scenario models.

2 Overview on impact characteristic and topology

Impact phenomenon had been observed since more than half century ago and due to of its complexity and scope, this field become interesting to be observed accounting for various point of views. Several known research on impact science and engineering are including impact assessment by Oterkus et al. [3], pulse pressure observation by Schleyer et al. [4] and response subjected to blast by Panciroli and Abrate [5].

Impact phenomenon of ship collision is a complex process with involvement of large contact force, crushing of hull structure and rupture of side plating. The consequences may be severe as well remarkable and the process itself is highly nonlinear. The nonlinearities of impact phenomenon are also influenced by the material characteristic. Isotropic, kinematic, or a combination of isotropic and kinematic hardening may be obtained by varying a parameter, called β between 0 and 1. Krieg and Key [6] formulated this model and the implementation is based on their paper. In isotropic hardening, the center of the yield surface is fixed but the radius is a function of the plastic strain. In kinematic hardening, the radius of the yield surface is fixed but the center translates in the direction of the plastic strain. The yield stress of mild steel is well known very sensitive to the strain rate as introduced by Jones [7]. It can be concluded from his work that the yield stress of mild steel increases with increasing strain rates. Jones on other hand mentioned that aluminum is essentially insensitive to strain rates normally encountered in practice. In event of contact between two structure objects, when a structure has been deformed enough, it will rupture and undergo a failure. Predicting the rupture on structure accurately is a complex problem. Different load conditions will give different failure modes [8]. Rupture criteria of ductile metal beams subjected to large dynamic loads was discussed by Jones and Wierzbicki [9]. Three main failure criteria were discussed. The first mode is tensile tearing failure mode. This failure mode occur when the maximum strain equals the critical rupture strain of the material and beam rupture. The second is the transverse shear failure mode which develops in a beam when large transverse shear deformations occur within a very short region of the plastic beam. The third failure is the energy density failure mode. This mode is assumed that rupture occurs in a rigid-plastic structure when the absorption of plastic work per unit volume reaches the critical value.

Topology of impact phenomenon in ship collision is also diverse. Accounting for position as presented in Figure 1, impact can be divided into:

  • (a)

    Side collision

  • (b)

    Head-to-head collision

Collision types: (a) side collision [10] and (b) head-to-head collision [11].
Figure 1

Collision types: (a) side collision [10] and (b) head-to-head collision [11].

In term of striking object or indenter, various objects can be taken into consideration based on its involvement possibility in event of collision, namely:

  • (a)

    Ship

  • (b)

    Container

  • (c)

    Bridge pier

  • (d)

    Offshore jacket

  • (e)

    Port wall

  • (f)

    Etc.

In addition to collision type and indenter classification, friction properties also affect the structural response during and prior collision process. In impact of ocean engineering, typically, static coulomb friction coefficients in the range of 0.2-0.4 are adopted [12]. However, based on friction investigation based on collision accident by Bae et al. [2], the implementation of friction coefficient between mild steel can be considered as other coefficient option in observation of impact behavior. In the simulation carried out in the following section, the steels friction coefficient has been implemented.

3 Development in calculations method and instrument

Demand to increase safety for ship and its crew and cargo makes numerous researchers from different fields expand their attention in accidental load phenomenon. In order to achieve satisfaction in calculation for collision and other impact incidents, methodology is improved continuously. The estimation of structural response is proposed by Minorsky [1] in his known energy estimation formula for high-energy collision. This method assumes that energy to destroy involved components in collision is equally perpendicular with volume of destroyed material. This formula is inviting researchers to refine it, such as done by Woisin [13] in his low-energy collision formula and Zhang [11] who divides the energy formula based on several deformation pattern. The proposed formula by mentioned researchers before is presented consecutively in Equations 1 to 5. Besides empirical formulas, the implementation of simplified expressions in prediction structure behaviour under various loadings is also performed in impact engineering such by Haris and Amdahl [14] at NTNU who assumed that the complex structural arrangement of ship is presented in simplification models of several basic elements, such as cruciform, T-section, girder, and plating. The total resistance of this method for side and bow structures respectively is presented in Equations 6 and 7. The both of discussed methodology are built based on actual experiment, survey, and also assumption. In history of ship collision, several full-scale experiments are recorded, for example in the Netherlands 1998. Before that, joint cooperation between Japan, the Netherlands, and Germany also conducted similar experiment using two inland waterway tankers [11]. In other hand, a research based on real accident was also conducted by several parties such as by joint cooperation between Indonesia and South Korea in predicting recent collision in Sunda strait. Several surveys are conducted to shipyard where the target ship is repaired to measure damage extent and also take material specimen for laboratory experiment [2]. The accuracy of calculations with this method is believed good enough to be a reference for empirical and simplified methods. However, constraint in time and cost make full-scale experiment and survey cannot be conducted comfortably by wide parties. Empirical formula and simplified expression are also need continuous update in order to seek sustainable precision. The process to develop formula is considered costly which is expected consume more time of main analysis and calculation. E=47.2RT+32.7(1) E=47.2RT+05(h.ts2)(2) E=0.77εcσ0RT(3) E=3.50(td)0.67σ0RT(4) E=3.21(tl)0.6σ0RT(5)

As exceptional high improvement in computational technology, finite element method rises as reliable calculation instrument to predict various phenomenon in science and technology. This method is judged powerful enough to predict nonlinear phenomenon which is complicated, such as collision [1518] and grounding [19]. By this method all design of involved objects’ components can be defined in both structural and material levels. Computational code which is used by this method is flexible and can be implemented for various analyses. An algorithm for collision analysis is presented in Equations 8 to 10. Time computation of this method can be adapted according to time and cost allocation which longer time space for calculation and related data of actual experiment in material for example, will boost up the reality and reliability aspects of performed works. Pside=Pcf=i=14Pwf+Ps(6) Pbow=i=14j=145.01λM0jCcfjtcfj12i+p=1nq=133.66λM0qCcfqtcfq12αIqp(7) {at}=[M]1({Ftext}{Ftint})(8) Fint=Σ(Ω(BTσndΩ+Fhg)+Fcontact)(9) {xt+Δt}={x0}+{ut+Δt}(10)

4 Impact scenario and experiment preparation

This section presents the model of impact scenario in collision simulation. The preparation for virtual simulation is given together with illustration of coordinate system and ship model.

4.1 Involved vessel model

A series of collision analysis is performed for various impact models with the explicit FE code ANSYS LS-DYNA. The considered struck ship is an 85 m passenger ship with a double hull structure configuration as presented in Figure 2. The larger ship is taken into analyses by cargo vessel with 144 m in length. The width of the striking ship is 19.8 m, design the draft is 5.6 m and the height is 10.2 m.

Double hull configuration of the struck ship: (a) 3.5 m and (b) 1.5 m.
Figure 2

Double hull configuration of the struck ship: (a) 3.5 m and (b) 1.5 m.

4.2 Proposed impact scenario

The scenario of collision impact is built based on side collision type with two major parameters, namely structure and material. In term of structure, the component preferences of hull structure is defined based on coming direction of the striking ship, i.e. side shell for transversal component and deck as longitudinal component are used as given in Figure 3.

Impact scenario model based on component preference parameter.
Figure 3

Impact scenario model based on component preference parameter.

The structure configurations of double hull with difference on distance between outer and inner shell as given in Figure 2 are also taken as impact model. In material side, the mechanical properties of material especially strength characteristic as introduced by Callister [20] are adopted for scenario model. Four material types are used with several failure strain values. The material definition in term of kinematic hardening, isotropic hardening and kinematic-isotropic hardening are included in impact models. The detail of each impact scenario models are presented in Table 1 and 2.

Table 1

Chemical composition and mechanical properties for proposed materials [2127].

Table 2

Detail of proposed scenario models.

4.3 Virtual experiment

In virtual experiment process, the struck ship will be considered as a deformable structure and the striking ship as a rigid body. In present analysis, the plastic-kinematics material is applied into numerical models and the yield function of this material model is given in Equation 11 and 12. σy=[1+(εC)1P](σ0+βEPεPeff)(11)

EP=EtanEEEtan(12)

The element choice for present research is Belytschko–Tsay element. Tornqvist and Simonsen [28] suggested that the element-length-to-thickness (ELT) ratio should be within the range of 5-10 so that the local stress and strain fields can be captured well. Fine mesh with size 80 mm is applied on the core area of the struck ship and fine mesh with size 90 mm and 100 mm are applied on the transition and the outside area respectively. The element-length-to-thickness (ELT) ratio for this area in range 8-10. The area of the striking ship model is divided into two parts: the first area will experience direct contact with the struck ship. A fine mesh with size 340 mm is applied. The second is the rest area, where fine mesh of size 680 mm is applied.

During collision process, the striking ship will move with velocity 12 knots or 6.17 m/s to proposed target point while the struck ship is set to be fixed in centerline while the ends of the model will be clamped. The fixation is applied on all frames in the end of model. In the simulation which involved the struck ship as a deformable structure and the striking ship as a rigid body, the virtual experiment model consists of more than 70,000 elements and the total computation time are varies between 9 – 21 hours on a high performance computer (4th Generation Intel Core i7-4790 Processor 4.00 GHz, 16 GB RAM).

5 Finite element simulation results

The analysis results of various impact scenario models are presented in this section. The global results of 14 analyses are given in Table 3. Several remarkable results can be observed on these data. First, in term of component preference, the longitudinal structure was proofed provided better resistance subjected to impact load as presented in Figure 4 and 5.

Energy and load characteristic of collision on side shell.
Figure 4

Energy and load characteristic of collision on side shell.

Energy and load characteristic of collision on main deck.
Figure 5

Energy and load characteristic of collision on main deck.

Table 3

Structural results of ship structure according applied parameters.

The cross-section based on coming direction of the striking ship was much smaller than side shell which was transversal component. During collision happened to the side shell, large area was more easily deformed due to centralized load on wide cross-section if it was compared with collision on main deck. As a consequences, the collision energy of collision on transversal component was lower but the tearing on side zone was bigger than collision on longitudinal component.

Still in structure parameter, the width of the double hull was evidenced affect the collision energy as well as damage extent on both of outer and inner shell. The effect of wide distance between two shells is indeed providing much better defence subjected to side collision. However, amount of carried the carried cargo may be drastically reduced as well as the efficiency of ship itself will be going down. The illustration of damage between two double hull sizes is presented in Figure 6.

Damage on double hull structure: (a) width 3.5 m and (b) width 1.5 m.
Figure 6

Damage on double hull structure: (a) width 3.5 m and (b) width 1.5 m.

In terms of material, mechanical properties are clearly affect the results on energy and load as presented in Figure 7. The small difference was spotted between material 1010 and 1020 since these materials were coming from same class, plain low-carbon steel. In other hand, during comparison that was performed using 1040 and 1080, the significant result in term of damage extent had clearly happened after collision process. As presented in Appendix A, during collision on structure with material 1080, the tearing on inner shell was very small and from Table 3, the tearing length was below 1 meter. In deployment of double hull structure with the width between inner and outer walls 1.5 m, this material type can be considered as good option to be applied in structural arrangement in order to reduce the damage due to side impact. This work also successfully verified that carbon composition is the most suitable indicator in assessing material strength. The highest strength material contains highest carbon composition which after simulation, it is found that this material produces the best resistance among of all proposed materials in this work.

Energy characteristic for all proposed material types.
Figure 7

Energy characteristic for all proposed material types.

The effect failure strain to collision energy can be considered significant. With the change 0.1, the product of energy can differ by almost 5 MJ. During the observation on effect of this parameter, the higher failure strain, the less difference in collision energy occurred. It can be seen in the results of Table 3 and Figure 8, the difference in term of energy between 0.2 and 0.3 is below 3.5 MJ which is smaller than difference between 0.1 and 0.2. The higher failure strain also affected the damage extent on both of hulls. The damage from failure strain value 0.1 to 0.3 gradually went down.

Effect of failure strain into energy characteristic.
Figure 8

Effect of failure strain into energy characteristic.

In hardening parameter, no significant results were found in terms of collision energy as presented in Appendix B. However, if the damage illustration in Appendix B is observed carefully, the more wrinkling was found during structure was defined as isotropic hardening. This phenomenon occurred because during isotropic hardening was applied on structure, the yield surface expands uniformly in all directions with plastic flow which made the intersection structure between deck and shell experienced more folding than when kinematic hardening was applied onto the structure. Characteristic of structure after rupture is also described together with illustration for different material assumptions in this appendix.

6 Final remarks

This paper presents the study of the behavior in structure and material levels considering for various side impact scenario models. The scenario models were successfully solved in virtual experiment and the results were successfully delivering important information regarding effect of several parameters in impact phenomenon. In terms of ship material, the resistance capability of ship was highly influenced by specific chemical composition. For the same target structure, higher Carbon composition would provide advantage during accidental load occurred. Failure strain in analysis affected produced energy for destroying involved structure which for the same size of double hull, occurred deformation pattern was also triggered by hardening type. In case of different width between inner and outer walls, a wider space was considered provide more safe distance in event of side collision. Alternative options to increase safety and resistance against side collision can be considered based on present work. The design of construction configuration especially accounting for accidental load should be given serious attention while the efficiency of the ship has to be in reasonable level. The material from medium and high-carbon steel could be taken as consideration to be applied on side hull and other area which susceptible suffer big loss due to impact load. The chosen material also could be judged from its chemical as well as mechanical properties to provide balance between cost and safety. The impact simulation which involves very high nonlinearities, the given parameter namely failure strain and hardening rules could significantly affect the results. The tendency of implementation of these parameters are presented in this work which could be guideline and reference for further impact analyses.

Acknowledgement

The gratitude is offered to colleagues of the authors, Mr. Irfan Taufiqurrahman and Mr. Teguh Fajar Basuki who both of them from PT Samudra Marine Indonesia (SMI) Cilegon Branch, West Java, Republic of Indonesia for guiding the chance to perform survey on repair process of ship which experienced collision accident and providing ship design plan for present work. The special thanks is given especially by corresponding author to Mr. Teguh Putranto from Institute Technology of Sepuluh Nopember for providing guidance in performing the virtual experiments.

Nomenclature

βHardening parameter
[M]mass matrix
{at}acceleration at time t
{Ftext}applied external and body force vector
{Ftint}internal force vector which is given by Equation (8)
σ0flow stress of the material in Equations (3) to (5)
σoInitial yield stress in Equation (11)
σyYield stress
εStrain rate
εccritical rupture strain of the material which is determined from εc = 0.10 (εf / 0.32)
εfsteel material ductility obtained in tensile test
εPeffEffective plastic strain
daverage width of the plates in the crushed cross-section
EYoung’s modulus in Equation (11)
Eabsorbed energy in Equations (1) to (5)
EpPlastic hardening modulus
EtanTangent modulus
Fhghourglass resistance force, and Fcontact is the contact force
Hheight of rupture aperture in side shell
lcritical tearing length
mnumber of cruciform, and
nnumber of T-section.
PCowper-Symonds strain rate parameters
Pbowresistance of bow structure of the striking ship
Psideresistance of side structure of the target ship
RTdestroyed material volume for both struck and striking ship / resistance factor
taverage thickness of crushed plate
tsside shell thickness
CCowper-Symonds strain rate parameters

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Footnotes

    About the article

    Received: 2016-04-12

    Accepted: 2017-02-28

    Published Online: 2017-04-22


    Citation Information: Open Engineering, Volume 7, Issue 1, Pages 91–99, ISSN (Online) 2391-5439, DOI: https://doi.org/10.1515/eng-2017-0014.

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    © 2017 A. R. Prabowo et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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