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Dynamics
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Structural Dynamics of Offshore Structures, Structural Components, and Unmanned Inspection...
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Structural Dynamics of Offshore Structures, Structural Components, and Unmanned Inspection Vehicles

A special issue of Dynamics (ISSN 2673-8716).

Deadline for manuscript submissions: closed (27 March 2022) | Viewed by 13095

Special Issue Editors

Prof. Dr. Dimitrios Pavlou

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Guest Editor
Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, N-4036 Stavanger, Norway
Interests: structural dynamics; solid mechanics; finite elements; fracture mechanics; composite materials
Dr. Tiago Fazeres Ferradosa

E-Mail Website
Guest Editor
Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Interests: offshore foundations; risk and reliability analysis; scour phenomena; sea climate modeling and extreme events theory applied to civil and ocean engineering
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Stylianos Markolefas

E-Mail Website
Guest Editor
General Department, National and Kapodistrian University of Athens, 34400 Psachna, Greece
Interests: solid mechanics; finite elements; gradient elasticity; mixed finite element methods; fatigue; adhesively bonded joints; vehicle dynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is devoted to ‘Structural Dynamics of Offshore Structures, Structural Components, and Unmanned Inspection Vehicles’. It will combine fundamental research on structural dynamics and mechanical vibrations with engineering applications on oil rigs, offshore wind turbines and marine energy converters, ships, ROVs for inspection of the seabed and the topside of offshore structures, and related structural components.

Topics of interest include but are not limited to structural dynamics, soil dynamics, hydrodynamics, aerodynamics, fluid–structure interaction, wave propagation, environmental loads, fatigue under dynamic loads, structural health monitoring, machine learning, NDT, finite elements, boundary elements, analytical methods, scour phenomena and scour-induced fatigue, pipelines, foundations, and energy converter hydrodynamic and structural performance.

We are primarily interested in original research papers containing novel solutions, methods, and models. The paper should include at least one engineering application. Please inform the Guest Editor of your intention to submit a manuscript for possible publication in the Special Issue as soon as possible.

Prof. Dr. Dimitrios Pavlou
Prof. Dr. Tiago Fazeres-Ferradosa
Prof. Dr. Stylianos Markolefas
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. Dynamics is an international peer-reviewed open access quarterly 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 1000 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

  • structural dynamics
  • soil dynamics
  • hydrodynamics
  • aerodynamics
  • fluid–structure interaction
  • wave propagation
  • environmental loads
  • fatigue under dynamic loads
  • structural health monitoring
  • machine learning
  • NDT
  • finite elements
  • boundary elements
  • analytical methods

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

9 pages, 1497 KiB  
Article
Fatigue Strength Curve for Tubular Joints of Offshore Structures under Dynamic Loading
by Sudath C. Siriwardane, Nirosha D. Adasooriya and Dimitrios Pavlou
Dynamics 2021, 1(1), 125-133; https://doi.org/10.3390/dynamics1010007 - 22 Aug 2021
Cited by 8 | Viewed by 3529
Abstract
Offshore structures are subjected to dynamic environmental loads (wave and wind loads). A stress-life fatigue strength curve is proposed for tubular joints which are in the splash zone area of offshore jacket structures. The Det Norske Veritas (DNV) offshore structures standards given design [...] Read more.
Offshore structures are subjected to dynamic environmental loads (wave and wind loads). A stress-life fatigue strength curve is proposed for tubular joints which are in the splash zone area of offshore jacket structures. The Det Norske Veritas (DNV) offshore structures standards given design T-curve in the air is modified with the environment-dependent parameters to obtain this fatigue strength curve. Validity of the curve is done by comparing fatigue lives given by the proposed curve with experimental fatigue lives of tubular joints tested in seawater under different loading conditions. The fatigue assessment of a case study tubular joint is performed using the proposed curve. Nominal stress ranges of the members, which are connected to the joint, are obtained by dynamic analysis of the jacket structure. Stress concentration factors are utilized with the nominal stresses to obtain the hot spot stress ranges. Fatigue lives are calculated and compared with the conventional approach. Hence the applicability and significance of the proposed fatigue strength curve are discussed. Full article
(This article belongs to the Special Issue Structural Dynamics of Offshore Structures, Structural Components, and Unmanned Inspection Vehicles)
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46 pages, 3468 KiB  
Article
Strain Gradient Theory Based Dynamic Mindlin-Reissner and Kirchhoff Micro-Plates with Microstructural and Micro-Inertial Effects
by Stylianos Markolefas and Dimitrios Fafalis
Dynamics 2021, 1(1), 49-94; https://doi.org/10.3390/dynamics1010005 - 31 Jul 2021
Cited by 6 | Viewed by 4294
Abstract
In this study, a dynamic Mindlin–Reissner-type plate is developed based on a simplified version of Mindlin’s form-II first-strain gradient elasticity theory. The governing equations of motion and the corresponding boundary conditions are derived using the general virtual work variational principle. The presented model [...] Read more.
In this study, a dynamic Mindlin–Reissner-type plate is developed based on a simplified version of Mindlin’s form-II first-strain gradient elasticity theory. The governing equations of motion and the corresponding boundary conditions are derived using the general virtual work variational principle. The presented model contains, apart from the two classical Lame constants, one additional microstructure material parameter g for the static case and one micro-inertia parameter h for the dynamic case. The formal reduction of this model to a Kirchhoff-type plate model is also presented. Upon diminishing the microstructure parameters g and h, the classical Mindlin–Reissner and Kirchhoff plate theories are derived. Three points distinguish the present work from other similar published in the literature. First, the plane stress assumption, fundamental for the development of plate theories, is expressed by the vanishing of the z-component of the generalized true traction vector and not merely by the zz-component of the Cauchy stress tensor. Second, micro-inertia terms are included in the expression of the kinetic energy of the model. Finally, the detailed structure of classical and non-classical boundary conditions is presented for both Mindlin–Reissner and Kirchhoff micro-plates. An example of a simply supported rectangular plate is used to illustrate the proposed model and to compare it with results from the literature. The numerical results reveal the significance of the strain gradient effect on the bending and free vibration response of the micro-plate, when the plate thickness is at the micron-scale; in comparison to the classical theories for Mindlin–Reissner and Kirchhoff plates, the deflections, the rotations, and the shear-thickness frequencies are smaller, while the fundamental flexural frequency is higher. It is also observed that the micro-inertia effect should not be ignored in estimating the fundamental frequencies of micro-plates, primarily for thick plates, when plate thickness is at the micron scale (strain gradient effect). Full article
(This article belongs to the Special Issue Structural Dynamics of Offshore Structures, Structural Components, and Unmanned Inspection Vehicles)
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27 pages, 13751 KiB  
Article
Crashworthiness Performance of Aluminium, GFRP and Hybrid Aluminium/GFRP Circular Tubes under Quasi-Static and Dynamic Axial Loading Conditions: A Comparative Experimental Study
by Stavros S. A. Lykakos, Protesilaos K. Kostazos, Odysseas-Vasilios Venetsanos and Dimitrios E. Manolakos
Dynamics 2021, 1(1), 22-48; https://doi.org/10.3390/dynamics1010004 - 28 Jun 2021
Cited by 6 | Viewed by 3902
Abstract
Offshore structures are exposed to risks of vessel collisions and impacts from dropped objects. Tubular members are extensively used in offshore construction, and thus, there is scope to investigate their crashworthiness behaviour. Aluminium, glass fibre reinforced polymer (GFRP) and hybrid aluminium/GFRP circular tube [...] Read more.
Offshore structures are exposed to risks of vessel collisions and impacts from dropped objects. Tubular members are extensively used in offshore construction, and thus, there is scope to investigate their crashworthiness behaviour. Aluminium, glass fibre reinforced polymer (GFRP) and hybrid aluminium/GFRP circular tube specimens were fabricated and then tested under quasi-static and dynamic axial loading conditions. Two hybrid configurations were examined: external and internal layers from respectively aluminium and GFRP, and vice versa. The material impregnated with epoxy resin woven glass fabric was allowed to cure attached to the aluminium layer to ensure interlayer bonding. The quasi-static and dynamic tests were conducted using respectively a universal testing machine at a prescribed crosshead speed of 10 mm/min, and a 78 kg drop hammer released from 2.5 m. The non-hybrid configurations (aluminium and GFRP specimens) outperformed their hybrid counterparts in terms of crashworthiness characteristics. Full article
(This article belongs to the Special Issue Structural Dynamics of Offshore Structures, Structural Components, and Unmanned Inspection Vehicles)
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