Autor: Kowalski, Jakub. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Charytatywni komandosi : organizacje humanitarne pomagają ofiarom
Autorzy:: Kowalski, Jakub.
Powiązania:: Rzeczpospolita 2003, nr 72, s. A5
Data publikacji:: 2003
Tematy:: Ochojska, Janina
Kraszewski, Mariusz
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 2.

Tytuł:: Experimental and numerical investigation on specimen geometry effect on the ctod value for VL-E36 shipbuilding steel
Autorzy:: Kowalski, Jakub
Powiązania:: https://bibliotekanauki.pl/articles/1955590.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: CTOD
fracture toughness
ductility
FEM
abaqus
Opis:: There are special cases in the marine industry, where additional material tests, such as the fracture toughness test, must be performed. Additional fracture toughness tests, such as CTOD (Crack Tip Opening Displacement), are typically performed on three-point bend specimens. The dimension that defines all the specimen dimensions is the thickness of the material to be tested. It is recommended by classification societies (e.g. DNVGL) to test specimens that are twice as high as the material thickness. The width determines the length and, therefore, the weight of the specimen which, for a 100 mm plate is over 140 kg. Current ASTM E1820, BS7448-1 and ISO 12135 testing standards also allow for proportions other than those recommended. This results in a much smaller test piece. Reducing the specimen size allows the testing machine to achieve lower forces than a specimen with a width to thickness ratio of two. This paper presents the effect of changing the specimen geometry on CTOD test results. Research was performed for specimens with a height to thickness ratio of one and two. Abaqus software was used for numerical calculations. The numerical results were, at selected points, verified experimentally.
Źródło:: Polish Maritime Research; 2021, 3; 110-116
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Experimental and numerical investigations of ultimate strength of imperfect stiffened plates of different slenderness
Autorzy:: Woloszyk, Krzysztof
Garbatov, Yordan
Kowalski, Jakub
Samson, Leszek
Powiązania:: https://bibliotekanauki.pl/articles/1573852.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: stiffened plate
ultimate strength
FEM
boundary conditions
Opis:: The objective of this study is to analyse the behaviour of compressed stiffened plates of different slenderness using experimental and numerical methods. The presented results are part of a long-term project to investigate the ultimate strength of geometrically imperfect structures subjected to different degradation phenomena, including corrosion degradation and locked cracks. Several specimens were subjected to a uniaxial compressive force, and the most important quantities related to the structural behaviour were captured and analysed. A finite element model, accounting for material and geometrical nonlinearities and initial geometrical imperfections, was developed using the commercial software ANSYS. The residual welding-induced stresses were measured in the middle cross-section for two specimens. The initial imperfection was identified by employing a close-range photogrammetry approach. It was concluded that the numerical analyses, based on the finite element model, predict the ultimate strength of stiffened plates accurately, although some deviations were also observed. The detailed analysis with the indication of possible uncertainty is presented, and several conclusions are derived.
Źródło:: Polish Maritime Research; 2020, 4; 120-129
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Idziemy dalej : Adamkus-Kwaśniewski : prezydent Litwy u prezydenta Polski
Autorzy:: Kowalski, Jakub.
Powiązania:: Rzeczpospolita 2003, nr 3, s. A4
Data publikacji:: 2003
Tematy:: Adamkus, Valdas
Kwaśniewski, Aleksander (1954- )
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 5.

Tytuł:: Idziemy dalej : Adamkus-Kwaśniewski : prezydent Litwy u prezydenta Polski
Autorzy:: Kowalski, Jakub.
Powiązania:: Rzeczpospolita 2003, nr 3, s. A4
Data publikacji:: 2003
Tematy:: Adamkus, Valdas
Kwaśniewski, Aleksander (1954- )
Politics
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 6.

Tytuł:: Influence of process of straightening ship hull structure made of 316L stainless steel on corrosion resistance and mechanical properties
Autorzy:: Kowalski, Jakub
Licznerski, Łukasz
Supernak-Marczewska, Milena
Emilianowicz, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/1573799.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: 316L steel
flame straightening
corrosion resistance
mechanical properties
Opis:: The AISI 316L type steel belongs to the group of chromium-nickel stainless steels. They are determined according to European standards as X2CrNiMo17-12-2 and belong to the group of austenitic stainless steels. Steels of this group are used for elements working in seawater environments, for installations in the chemical, paper, and food, industries, for architectural elements, and many others. The chemical composition of corrosion-resistant austenitic steels provides them with an austenite structure that is stable in a wide temperature range, under appropriate conditions for heating, soaking, and cooling. 316L steel plate was subjected to a technological treatment of hot straightening with an oxyacetylene torch, which is not commonly used for this type of steel, mainly due to the lack of objective assessment of whether the austenitizing temperature has been achieved and the stability of the heat treatment process is ensured. The single-phase structure of austenite with high corrosion resistance, without precipitation of carbides, steel is obtained by supersaturation in water from 1100°C. The purpose of the presented research was to determine the usefulness of the flame straightening process for a ship structure made of 316L steel.
Źródło:: Polish Maritime Research; 2020, 4; 103-111
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki