Development of interlink wear estimation method for mooring chain of floating structures: Validation and new approach using three-dimensional contact response

Takeuchi, Takaaki; Utsunomiya, Tomoaki; Gotoh, Koji; Sato, Iku

doi:10.1016/j.marstruc.2020.102927

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…Enhancement of marine corrosion and tribocorrosion resistance of offshore mooring chain steel by aluminizing process 136 [22,41]. The 5 N load was applied in the study, corresponding to an average Hertzian pressure of 1216.2 MPa with a circular contact area diameter of 0.089 mm.…”

Section: Sabri Alkanmentioning

confidence: 99%

“…Mooring chains and accessories are subject to severe wear between links due to relative movement from waves, wind and ocean currents [20,21]. Mooring lines are also exposed to abrasion and impact in the splash zone generated by heavy waves and floating objects and face abrasive effects in the thrash zone [22,23]. Moreover, corrosion is more severe in the splash zone than in other areas due to higher oxygen concentrations for offshore structures and their mooring systems [10,24,25].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

Alkan

2022

Brodogradnja

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The safety of mooring systems and accessories is one of the most critical issues in the structural integrity of floating oil/gas and renewable offshore structures. Mooring chains and accessories operate under dynamic conditions in harsh marine environments. They are subject to severe wear and corrosion between their links due to relative movement from waves, wind, and ocean currents that disrupt structural integrity. To cope with this problem, the pack-aluminizing process was applied on the R4 grade offshore mooring chain steel for 2 h at 850 °C to improve corrosion and wear-corrosion (tribocorrosion) resistance in 3.5% NaCl. The tribocorrosion behaviour of untreated and aluminized samples was investigated by a tribo-electrochemical setup that simultaneously allows for collecting the wear and corrosion data. Potentiodynamic and potentiostatic corrosion and tribocorrosion tests were carried out to understand corrosion kinetics. Optical, SEM, XRD and EDS analyses were performed to characterize the aluminide layer and surface morphologies before and after tribocorrosion investigations. In polarization scans under corrosion and tribocorrosion conditions, the current showed a significant activation stretch of several orders of magnitude, with minor potential changes in the anodic region. Due to the galvanic effects of sliding under natural electrochemical conditions, the untreated R4 alloy exhibited cathodic properties in the wear track, while the aluminium coating was out of the wear track due to its oxide-forming ability. At the cathodic potential, two hard Al2O3 materials under pure mechanical effects and third bodies emerging from cracks on the coating surface increase the friction coefficient (COF), while the oxide product film, which has a lubricating ability and pits which reduces the contact area, caused a decrease in COF at the high anodic potential. The study revealed that while the aluminide layer improved the corrosion and tribological character of R4 alloy, material loss from wear track increased due to micro fractures and cracks in the coating layer during sliding tribocorrosion conditions.

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Section: Sabri Alkanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

Alkan

2022

Brodogradnja

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“…Researching the behavior of ship mooring chains on shore has been an important objective for different groups of researchers [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. The static, dynamic, and fatigue stresses occurring in the chain links for different operating conditions were thus highlighted.…”

Section: Introductionmentioning

confidence: 99%

“…From those mentioned above, it can be seen that until now, the research related to the chain links made of metallic and non-metallic materials has focused on the establishment of the dimensions of these chain links [1,7,[31][32][33], the efforts generated in the chain links during operation [8,18,25,26,31], the modeling by the finite element method or by other methods of the stresses and deformations from chain links during their mechanical loading [9,[12][13][14][15]18,19], investigating the fatigue behavior of chain links [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior of Chain Links Made of Polymeric Materials Manufactured by 3D Printing

et al. 2023

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For reduced mechanical stress, some chains with links made of metallic materials could be replaced by chains made of polymeric materials. A lower weight and a higher corrosion resistance would characterize such chains. From this point of view, research on the behavior of chain links made of polymeric materials under the action of tensile stresses can become important. Modeling by the finite element method highlighted some specific aspects of the behavior of a chain link subjected to tensile stresses. Later, we resorted to the manufacture by 3D printing of some chain links from four distinct polymeric materials, with the modification of the size of the chain link and, respectively, of the values of some of the input factors in the 3D printing process. The tensile strength of the chain links was determined using specialized equipment. The experimental results were processed mathematically to determine some empirical mathematical models that highlight the influence of the values of the input factors in the 3D printing process on the tensile strength of the samples in the form of chain links. It thus became possible to compare the results obtained for the four polymeric materials considered and identify the polymeric material that provides the highest tensile strength of the sample in the form of a chain link. The results of the experimental research showed that the highest mechanical resistance was obtained in the case of the links made of polyethylene terephthalate glycol (PETG). According to experimental results, when tested under identical conditions, PETG links can break for a force value of 40.9 N. In comparison, polylactic acid links will break for a force value of 4.70 N. Links printed in the horizontal position were almost 9-fold stronger than those printed in the vertical position. Under the same test conditions, according to the determined empirical mathematical models, PETG links printed in a horizontal position will break for a force of 300.8 N, while links printed in a vertical position will break for force values of 35.8 N.

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“…The load range of the test was 3-6% minimum breaking load, and its angle range was approximately 18°; the test cycle was approximately 5 s. The applied angle range and sliding velocity were much larger than the values encountered in actual engineering to accelerate the experimental process (the actual chain link motion angle is about 1-2° [10]). Takeuchi [15] validated the quantitative interlink wear estimation method. A material test and a finite-element (FE) analysis were conducted, where an interlink wear estimation formula was derived, and a coupled dynamic analysis was conducted to obtain the mooring chain response.…”

Section: Introductionmentioning

confidence: 99%

Modified Method for Determination of Wear Coefficient of Reciprocating Sliding Wear and Experimental Comparative Study

Liu

Wang

et al. 2022

JMSE

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A modified method for predicting the wear coefficient of reciprocating sliding wear was proposed in this study, which is less time-consuming. Based on this method, reciprocating sliding wear tests of three chain alloys (CM490, SS316, and TC4) under different loadings were conducted and the friction coefficient, wear coefficient, and wear morphology were obtained and compared. The results indicated that the time-variant coefficient of friction (CoF) could be used as an indicator for the stable wear state; moreover, it also changes periodically with the wear direction. Statistical analysis of friction coefficient indicated that it follows bimodal distribution or multimodal distribution. The friction and wear behaviors of CM490 and SS316 were different from those of TC4, and a detailed micro-morphological analysis indicated that the discrepancy is caused by the difference in the quantity and size of the wear debris. Furthermore, an upper limit of the contact stress-dependent wear coefficient was also observed, and the variability of the wear coefficient was also analyzed.

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Development of interlink wear estimation method for mooring chain of floating structures: Validation and new approach using three-dimensional contact response

Cited by 8 publications

References 13 publications

Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

Tensile Behavior of Chain Links Made of Polymeric Materials Manufactured by 3D Printing

Modified Method for Determination of Wear Coefficient of Reciprocating Sliding Wear and Experimental Comparative Study

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