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    Wyświetlanie 1-7 z 7
    Tytuł:
    Influence of pitting corrosion on fatigue and corrosion fatigue of ship structures. Part I Pitting corrosion of ship structures
    Autorzy:
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260006.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    pitting corrosion
    ship structures
    offshore structures
    Opis:
    The present paper is a literature survey focused on a specific kind of corrosion, i.e. pitting corrosion and its influence on fatigue of ship and offshore steels. Mechanisms of a shortand long-term pitting corrosion in marine environment have been described including pit nucleation and growth phases. Some models of pit growth versus time of exposure have been presented. Some factors which influence the pit growth rate have been discussed briefly.
    Źródło:
    Polish Maritime Research; 2014, 1; 62-69
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of pitting corrosion on fatigue and corrosion fatigue of ship and offshore structures. Part II: load - pit - crack interaction
    Autorzy:
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260195.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    pitting corrosion
    fatigue
    ship structures
    offshore structures
    Opis:
    In the paper has been discussed influence of stresses on general corrosion rate and corrosion pit nucleation rate and growth , whose presence has been questioned by some authors but accepted by most of them. Influence of roughness of pit walls on fatigue life of a plate suffering pit corrosion and presence of the so called „ non-damaging” pits which never lead to initiation of fatigue crack, has been presented. Possibility of prediction of pit-to-crack transition moment by two different ways, i.e. considering a pit a stress concentrator or an equivalent crack, has been analyzed. Also, influence of statistical distribution of depth of corrosion pits as well as anticorrosion protection on fatigue and corrosion fatigue has been described.
    Źródło:
    Polish Maritime Research; 2015, 3; 57-66
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of pitting corrosion on strength of steel ships and offshore structures
    Autorzy:
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260055.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    pitting corrosion
    strength
    shipbuilding steels
    ship structures
    Opis:
    The present paper deals with the influence of pitting corrosion on mechanical properties of mild and low alloy steels and strength of steel structures under static and quasi-static loads. Pitting corrosion is a very important phenomenon that influence local strength of ship hull members. The present paper is based mainly on Japanese publications. Analyzing the standard tensile diagrams one can see that that pitting corrosion reduces the load corresponding to yield stress (YS) and, even more markedly, tensile strength UTS, reduces almost to zero plastic flow strains at YS load level and dramatically reduces the total elongation to fracture. Nominal UTS load for uniformly corroded specimens is higher than that for pitted specimens at the same average thickness loss. The strength related to the true fracture surface area (i.e. reduced by pits, taking into account real path of the crack through the pits) is almost independent of the thickness loss and is almost the same as for uniform thickness loss. For wide specimens the tensile strength depends mainly on the local deformation ability, and the maximum loading ability for large members, predicted on the base of the total true fracture surface area, can be overestimated. Concept of equivalent thickness loss for plates under bending and compression and for more complex structural models as well as relation between the average and the equivalent thickness losses has been presented. Approach based on degree of pitting (ratio of pitted area to total plate surface area) has been shown as a real and more convenient than the approach based on the thickness loss.
    Źródło:
    Polish Maritime Research; 2011, 4; 54-58
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural reliability assessment of corroded tanker ship based on experimentally estimated ultimate strength
    Autorzy:
    Woloszyk, Krzysztof
    Garbatov, Yordan
    Powiązania:
    https://bibliotekanauki.pl/articles/259065.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship structures
    reliability assessment
    corrosion
    ultimate strength
    tanker ship
    Opis:
    This work deals with the reliability assessment of a tanker ship hull structure subjected to a vertical bending moment and corrosion degradation. The progressive collapse and ultimate load carrying capacity are estimated based on experimentally tested scaled box-shaped-specimens. The translation of the strength estimate of the scaled specimen to the real tanker ship hull structure is performed based on the dimensional theory developing a step-wise linear stressstrain relationship. The load-carrying capacity is considered as a stochastic variable, and the uncertainties resulted from the scaled-specimen to the real-structure strength translation, and the subjected load of the real ship are also accounted for. A sensitivity analysis concerning the stochastic variables, included in the ultimate limit state function is performed. The partial safety factors, in the case of a scaled specimen and real structure, are also identified, and conclusions are derived.
    Źródło:
    Polish Maritime Research; 2019, 2; 47-54
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design criteria for scantling of longitudinal and transverse connections in the torsion box under fatigue loading
    Autorzy:
    Silva-Campillo, Arturo
    Suárez-Bermejo, Juan Carlos
    Herreros-Sierra, Miguel Ángel
    Powiązania:
    https://bibliotekanauki.pl/articles/1573576.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    fatigue life
    ship structures
    crack growth
    fracture
    Opis:
    Fatigue is one of the main failure modes in marine structures, and it is caused by the strong cyclic characteristics of the loads they support. This failure mode is amplified in areas of high stress concentration, such as at the intersection of primary and secondary elements. In this paper, a two-phase study is proposed that compares numerical and experimental results using a digital image correlation technique. The described procedure establishes selection, design, and scantling criteria and provides recommendations for the design of the transverse structure using specimens with different geometries. These geometries correspond to different designs for the transverse primary structure that use a longitudinal secondary stiffener with variable thickness and longitudinal spacing to transverse in a dynamic and quasi-static regime. The stress state for this regime is calculated based on the biaxiality indication concept, which uses the fatigue phenomenon (safety factor and sensitivity curves) and fracture mechanics (parameters of the Paris crack propagation law, correlation value, and law of variation of the stress intensity factor).
    Źródło:
    Polish Maritime Research; 2021, 2; 116-127
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Applicability of Aluminum Alloy Welding Processes during the Prefabrication of Ship Structures Based on the Multi-Index Method
    Autorzy:
    Urbański, Tomasz
    Taczała, Maciej
    Wąs, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2201867.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ship structures
    prefabrication process
    aluminum alloys welding
    welding processes
    evaluation criteria
    multi-index evaluation
    Opis:
    The purpose of the paper is to evaluate the processes of welding aluminum alloys in terms of their applicability to the process of prefabrication of ship structures. The prefabrication process requires solving a number of problems related to the welding processes used (e.g. the problem of welding incompatibilities, deformations). Therefore, the key issue is to choose the right welding process, which is complex and difficult. It requires analysis of the process considering many points of view (e.g. technological, economic, security) in order to maximize the objectivity of the choice. Therefore, an attempt at a comprehensive view requires the formulation of a set of accurate evaluation criteria. The multi-indicator expert assessment presented in the article makes it possible to make such a choice. Currently used methods of welding aluminum alloys, both those from the group of conventional and innovative methods, were assessed. As a result of the analysis, the so-called technological hierarchy that allows to rank the assessed processes in terms of their suitability in the process of prefabrication of ship structures.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 1; 133--139
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sandwich panels in shipbuilding
    Autorzy:
    Metschkow, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/260538.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    laser welding
    laser welded steel panels
    I-core panels
    connection of panels
    double-skin structure
    ship structures
    Opis:
    In this paper a short historical outline of laser technique development and its application to welding sandwich panels, is presented. Laser-welded sandwich panels of different geometry, today introduced in industrial scale, were described. Prefabrication process of folded ship constructions, in particular, of panel-to-panel connections and hybrid (sandwich panel – conventional construction) structures, was discussed. Attention was paid to various aspects of prefabrication, assembly and use of panel constructions.
    Źródło:
    Polish Maritime Research; 2006, S 1; 5-8
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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