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Mechanical Failure and Metal Degradation of Ships and Marine Structures...
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Mechanical Failure and Metal Degradation of Ships and Marine Structures (Volume II)

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: closed (31 May 2024) | Viewed by 7782

Special Issue Editors

Prof. Dr. Gang Liu

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Guest Editor
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian 116024, China
Interests: ocean engineering; marine structural safety; fatigue; fracture; creepage
Special Issues, Collections and Topics in MDPI journals
Dr. Yunze Xu

E-Mail Website
Guest Editor
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian 116024, China
Interests: corrosion; erosion-corrosion; steel; marine structure; pipeline
Special Issues, Collections and Topics in MDPI journals
Dr. Da-Hai Xia

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Interests: corrosion; electrochemistry and surface science
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Prof. Dr. Jian Zhang

E-Mail Website
Guest Editor
Jiangsu Provincial Key Laboratory of Advanced Manufacture and Process for Marine Mechanical Equipment, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Interests: underwater equipment biomimetic technology; modern design theory and methods of marine equipment, submersibles; pressure-resistant structures; buckling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ships and marine structures are constructed by various metallic materials including high-strength steels, stainless steels, copper alloys, titanium alloys and so on. The damage and failure of these metal components directly threaten the safety of ships, ocean platforms, offshore wind power structures, subsea vehicles, subsea pipelines, risers and cross-sea bridges. Due to the wind, wave and current loads in the ocean, ships and marine structures can suffer from serious mechanical failure, including fatigue, fracture, creepage, erosion and buckling. On the other hand, the metal structures can lessen the risks of electrochemical corrosion in seawater, which could induce the degradation of ships and marine structures. Furthermore, the synergy of the mechanical load and the corrosion (including but not limited to stress corrosion, erosion-corrosion, tribo-corrosion and corrosion fatigue) could lead to the quick failure of the ships and marine structures. As a result, detecting the metal damage and understanding the failure mechanism of metals caused by both mechanical load and electrochemical corrosion in complex marine environments are crucial for early warnings and the protection of ships and marine structures.

Prof. Dr. Gang Liu
Dr. Yunze Xu
Dr. Da-Hai Xia
Prof. Dr. Jian Zhang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ships and marine structures
  • marine metals
  • marine environment
  • mechanical failure
  • corrosion
  • synergy
  • damage monitoring

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Published Papers (4 papers)

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Research

20 pages, 6776 KiB  
Article
Numerical Simulation of Burst Failure in 2.5-Inch Unbonded Flexible Riser Pressure Armor Layers
by Xiaoya Liu, Zhongyuan Qu, Yi Liu, Jiawei He, Guangju Si, Sicong Wang and Qingsheng Liu
Metals 2024, 14(7), 762; https://doi.org/10.3390/met14070762 - 27 Jun 2024
Cited by 1 | Viewed by 1239
Abstract
Unbonded flexible risers have been widely used in the field of offshore engineering in recent years due to their excellent performance in extreme dynamic marine environments, structural compliance, low installation cost, and low quality. And, the internal pressure capacity of unbonded flexible risers [...] Read more.
Unbonded flexible risers have been widely used in the field of offshore engineering in recent years due to their excellent performance in extreme dynamic marine environments, structural compliance, low installation cost, and low quality. And, the internal pressure capacity of unbonded flexible risers is an important indicator of the mechanical performance of unbonded flexible risers. Based on a 2.5-inch, 8-layer typical unbonded flexible riser model, this paper examines the burst failure of the pressure armor layer. Firstly, the balance equation of each separate cylindrical layer and helical layer is derived by functional principle, and then the overall theoretical modeling of an unbonded flexible riser under axisymmetric loads is established by additionally considering the geometric relation between adjacent layers. Secondly, fully considering the complex cross-sectional geometric characteristics and the interlayer’s contact with the unbonded flexible riser, a simplified numerical 7-layer model is established by Abaqus, and the material with elastic-plastic properties is conferred. Finally, the validity of the proposed theoretical and numerical methods is verified through the axisymmetric behavior of the test data. Then the burst failure of the pressure armor layer is analyzed based on the material. At an internal pressure of 42 MPa, the pressure armor layer reached its yield stress of 300 MPa, with the entire cross-section yielding between 42 MPa and 42.5 MPa. Additionally, the effect of the friction coefficient is examined. Full article
(This article belongs to the Special Issue Mechanical Failure and Metal Degradation of Ships and Marine Structures (Volume II))
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12 pages, 3138 KiB  
Article
Effect of Residual Stress on the Ultimate Bearing Capacity of Titanium Alloy Pressure Spherical–Cylindrical-Combined Shells
by Yuxuan Wang, Jianting Guo, Bowen Zhang, Keke Ge, Liangbi Li and Feng Lv
Metals 2024, 14(1), 123; https://doi.org/10.3390/met14010123 - 20 Jan 2024
Viewed by 1462
Abstract
Titanium alloy pressure spherical–cylindrical shells enable the effective utilization of the strength of spherical and cylindrical pressure-resistant shell components. In this study, a numerical simulation of the residual stress of a titanium alloy butt-welding plate was conducted by employing sequential coupling and a [...] Read more.
Titanium alloy pressure spherical–cylindrical shells enable the effective utilization of the strength of spherical and cylindrical pressure-resistant shell components. In this study, a numerical simulation of the residual stress of a titanium alloy butt-welding plate was conducted by employing sequential coupling and a temperature heat source model. The results of welding residual stress analysis agreed well with the experimental results reported in the literature. Subsequently, the welding residual stress of a titanium alloy pressure spherical–cylindrical shell was calculated and analyzed using the same method. Finally, the influence of residual stress on the ultimate bearing capacity of the shell was assessed. On the inner surface of the shell, the horizontal welding residual tensile stress, perpendicular to the weld path, exhibited a bimodal distribution. The longitudinal welding residual tensile stresses were higher than the horizontal welding residual stress. Near the weld on the outer shell surface, higher longitudinal welding residual tensile stresses existed, whereas the horizontal welding residual stress was compressive. Both the inner and outer shell surfaces exhibited significant longitudinal residual tensile stresses along the weld path, though residual compressive stresses existed on both surfaces. The influence of welding residual stress on the ultimate load-bearing capacity of the shell was minimal. Full article
(This article belongs to the Special Issue Mechanical Failure and Metal Degradation of Ships and Marine Structures (Volume II))
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13 pages, 20976 KiB  
Article
Effects of Different Fouling Organisms on Corrosion Behavior of Carbon Steel in Dalian Seawater
by Wanbin Chen, Yihan Wang, Mingyu Wang, Yi Huang and Yunze Xu
Metals 2023, 13(9), 1503; https://doi.org/10.3390/met13091503 - 22 Aug 2023
Cited by 14 | Viewed by 1909
Abstract
Carbon steels are widely used in ocean engineering due to their cost effectiveness, ease of manufacture, and excellent weldability. However, the attachment of macro-fouling organisms in seawater poses a serious threat to the integrity of carbon steel structures. In this experiment, carbon steel [...] Read more.
Carbon steels are widely used in ocean engineering due to their cost effectiveness, ease of manufacture, and excellent weldability. However, the attachment of macro-fouling organisms in seawater poses a serious threat to the integrity of carbon steel structures. In this experiment, carbon steel plates were immersed in the Dalian Sea area from January to October to investigate the effects of macro-fouling on corrosion propagation. The electrochemical measurement indicated that the propensity for the corrosion of Q235B is ranked as ascidians > mussels > barnacles. The characterization results indicated that various marine organisms significantly influenced the corrosion behavior of Q235B carbon steel immersed in natural seawater. The colonization of barnacles inhibited corrosion at the barnacle central area, and the presence of barnacle covering caused crevice corrosion at the edges of the barnacle due to oxygen concentration cells. The presence of ascidians resulted in general corrosion due to the locally high conductivity and ion diffusion rate. A relatively compact rust layer, which exhibited localized defects, was observed beneath the mussels. Seawater had the ability to penetrate the rust layer through these defects, leading to the formation of pitting corrosion on the metal substrate. Full article
(This article belongs to the Special Issue Mechanical Failure and Metal Degradation of Ships and Marine Structures (Volume II))
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12 pages, 2597 KiB  
Article
Mutual Interactions of Lamb Waves in Nonlinear Elastic Plates
by Shuyi Ma, Guixian Zhang, Hongfeng Hou and Lidong Wang
Metals 2022, 12(12), 2175; https://doi.org/10.3390/met12122175 - 16 Dec 2022
Cited by 2 | Viewed by 1522
Abstract
The mutual interactions of Lamb waves in nonlinear elastic plates are studied in this article. Many researchers have investigated the interactions of Lamb wave modes at nonlinear higher harmonics. However, little is known about nonlinearity-driven Lamb modulations from two primary modes with different [...] Read more.
The mutual interactions of Lamb waves in nonlinear elastic plates are studied in this article. Many researchers have investigated the interactions of Lamb wave modes at nonlinear higher harmonics. However, little is known about nonlinearity-driven Lamb modulations from two primary modes with different frequencies. In this study, the existence of symmetric or antisymmetric mode due to Lamb wave mutual interactions is firstly theoretically formulated. Then, an approach is proposed to evaluate the intensity of phase velocity matching for selecting primary modes. Finally, the characteristics of the modulated wave generation are investigated and demonstrated. The generation of modulated waves in an aluminum plate and fatigue crack can be detected by mutual interactions of Lamb waves. The main contribution of this work is the proposed mutual interaction theory of Lamb waves in fatigue plates, which can guide fatigue detection in the metal plate. Full article
(This article belongs to the Special Issue Mechanical Failure and Metal Degradation of Ships and Marine Structures (Volume II))
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