Wyniki wyszukiwania - Biblioteka Nauki

1

Detection of Sub-Surface Defects in Semi-Finished Products from Aluminum Alloys by the Eddy Current Method

100%

Krysztofik J. , Malicki M.

Fatigue of Aircraft Structures

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2021

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tom Iss. 13

31--39

EN

The article presents the results of tests aimed at detecting discontinuities in the subsurface layer of elements intended for further processing. For the initial identification of discontinuities, the method of computed tomography was used. Based on the tomographic images of selected typical defects and measurements of the electrical conductivity of the material, the parameters for the eddy current tests were determined. A series of discontinuities in the subsurface layer to a depth of about 0.48 mm were detected. This allowed, at a given stage of machining, relevant elements to be selected for further processing.

2

Aspekty formalno-prawne w procesie projektowania instalacji ochrony katodowej

80%

Chojan K. , Malicki M. , Walkowiak D.

Ochrona przed Korozją

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2023

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tom nr 8

253--258

PL

W artykule przedstawiono kwestie formalno-prawne związane z procesem projektowania instalacji ochrony katodowej. Zwrócono uwagę na problem nieuwzględnienia ochrony katodowej w ustawie Prawo budowlane, co komplikuje uproszczone procedowanie projektów w organach administracji architektoniczno-budowlanej. Opisano również czynności formalno-prawne przeprowadzane podczas procesu projektowania, procedury urzędowe i terminy ich realizacji oraz typowe problemy związane z uzgadnianiem dokumentacji.

EN

The paper presents the process cathodic protection design in the context of formal and legal aspects. The problem of the lack of classification of cathodic protection in the Construction Law Act was discussed, which complicates the simplified proceeding of projects in the architectural and construction administration authorities. The formal and legal activities occurring during the design process, official procedures and the course of their administrative deadlines as well as typical problems related to the reconciliation of documentation are also presented.

3

Development of Diffraction Research Methodologies for Mediloy S-CO Alloy Speciments Made Using LPBF Additive Manufacturing

80%

Gadalińska E. , Malicki M. , Trykowska A. , Moneta G.

Fatigue of Aircraft Structures

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2023

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tom Iss.15

90--114

EN

This study focuses on the application and improvement of diffraction measurement methodologies for the optimization of manufacturing parameters of CoCr alloy components made by additive manufacturing (AM) - particularly for Mediloy S-Co alloy specimens made using Laser Powder Bed Fusion (LPBF) additive manufacturing. We measured the phase composition of specimens obtained in AM processes, the measurement of residual stresses resulting from the manufacture of these printed parts, as well as the effectiveness of stress relaxation through the use of heat treatments dedicated to this type of material. Findings reveal several insights into how printing strategies affect the porosity and residual stresses in additive manufacturing. Specimens with higher porosity, particularly those created using specific strategies that resulted in lower energy densities, exhibited lower residual stresses. Notably, printing direction and energy density were found to significantly affect the mechanical stresses within the specimens, with directional choices playing a critical role in the final properties of the parts. Additionally, our findings underscore the complex relationship between various printing parameters and the development of mechanical stresses, highlighting the impact of adjustments in printing strategy on the properties of printed components.

4

Microstructural And Mechanical Properties Of Selective Laser Melted Inconel 718 For Different Specimen Sizes

80%

Madejski B. , Malicki M. , Czarnewicz S. , Gruber K.

Fatigue of Aircraft Structures

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2020

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tom Iss. 12

15--26

EN

Selective laser melting (SLM) falls into the category of additive manufacturing technologies that are being increasingly used in the aerospace industry. This study presents the results of the examination of the microstructure and mechanical properties of selective laser melted Inconel 718. The tests were carried out for samples of different geometry (thickness, shape). The investigation showed the effect of the specimen’s size and the printing direction on the microstructure and mechanical properties. In the microstructural investigation, light and scanning electron microscopes were used. The microstructure investigation included measurements of the grain size and the carbides’ content. In order to estimate porosity computer tomography was used. Tensile tests were carried out at room temperature. The results showed differences in mechanical and microstructural properties of different size specimens.