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163 results on '"Torzewski, Janusz"'

9. Strength and Electrostatic Discharge Resistance Analysis of Additively Manufactured Polyethylene Terephthalate Glycol (PET-G) Parts for Potential Electronic Application.

Author

Talecka, Julia, Kluczyński, Janusz, Jasik, Katarzyna, Szachogłuchowicz, Ireneusz, and Torzewski, Janusz

Subjects
DIGITAL image correlation, THREE-dimensional printing, POLYETHYLENE terephthalate, MANUFACTURING processes, OPTOELECTRONIC devices
Abstract

Optoelectronic components are crucial across various industries. They benefit greatly from advancements in 3D printing techniques that enable the fabrication of intricate parts. Among these techniques, Material Extrusion (MEX) stands out for its simplicity and cost-effectiveness. Integrating 3D printing into production processes offers the potential to create components with enhanced electrostatic discharge (ESD) resistance, a critical factor for ensuring the reliability and safety of optoelectronic devices. Polyethylene terephthalate glycol-modified (PET-G) is an amorphous copolymer renowned for its high transparency, excellent mechanical properties, and chemical resistance, which make it particularly suitable for 3D printing applications. This study focuses on analyzing the mechanical, structural, and electrostatic properties of pure PET-G as well as PET-G doped with additives to evaluate the effects of doping on its final properties. The findings highlight that pure PET-G exhibits superior mechanical strength compared to doped variants. Conversely, doped PET-G demonstrates enhanced resistance to electrostatic discharge, which is advantageous for applications requiring ESD mitigation. This research underscores the importance of material selection and optimization in 3D printing processes to achieve desired mechanical and electrical properties in optoelectronic components. By leveraging 3D printing technologies like MEX and exploring material modifications, industries can further innovate and enhance the production of optoelectronic devices, fostering their widespread adoption in specialized fields. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Study on tensile and fatigue failure in the low-hardness zone of AA2519-T62 FSW joint

Author

Kosturek Robert, Slezak Tomasz, Torzewski Janusz, Wachowski Marcin, and Sniezek Lucjan

Subjects
aluminum, friction stir welding, microstructure, mechanical properties, low cycle fatigue, fracture, Engineering (General). Civil engineering (General), TA1-2040, Technology (General), T1-995, Manufactures, TS1-2301
Abstract

The aim of this research was to investigate the basic performance and failure of AA2519-T62 friction stir welded joint in tensile test and in low cycle fatigue regime. It has been reported that at the retreating side, the layer of overgrowth grains undergoes deformation in the TMAZ and forms a characteristic large-grain band partly surrounding the SZ. The reported UTS is very high and it equals 405 MPa, what corresponds to 86.5% joint efficiency value. The failure occurred in the LHZ at the retreating side with the fracture mechanism characterized by simultaneously cracking in several parallel planes. The LCF behavior of the tested joint indicates three stages of fatigue life: a relatively long period of cyclic hardening (up to 500–1000 cycles), the longest period of cyclic stabilization, followed by cyclic softening until failure. The fatigue crack initiation takes place in the near-surface layer of overgrown grains and then propagates through the low-hardness zone.

Published
2022
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19. The influence of welding parameters on macrostructure and mechanical properties of Sc-modified AA2519-T62 FSW joints

Author

Kosturek Robert, Śnieżek Lucjan, Torzewski Janusz, and Wachowski Marcin

Subjects
friction stir welding, mechanical properties, aa2519, aluminum alloy, welding parameters, fatigue, fractography, Engineering (General). Civil engineering (General), TA1-2040, Technology (General), T1-995, Manufactures, TS1-2301
Abstract

In this investigation, a 5 mm thick extrusion of AA2519-T62 alloy has been welded using friction stir welding method. The various sets of process parameters have been involved within the range of 400–1200 rpm tool rotation speed and 100–800 mm/min welding speed. Selected joints have been subjected to the macrostructure analysis, microhardness measurements, tensile and low cycle fatigue testing (at ε = 0.3%), and fractography analysis. It has been stated that imperfection-free macrostructure is obtained for welds produced with lowest welding speed: 100 mm/min and tool rotation speed within the range of 400–800 rpm. The highest joint efficiency (85%) has been obtained for the sample characterized by the presence of voids in the upper part of the stir zone. Considering macrostructure analysis and established mechanical properties of the joints, it may be concluded that the best set of welding parameters for AA2519-T62 is within the range of 600–800 rpm tool rotation speed with welding speed of 100 mm/min for used MX Triflute tool.

Published
2020
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24. Research on the post-weld explosive hardening of AA7075-T651 friction stir welded butt joints.

Author

KOSTUREK, Robert, LEWCZUK, Rafał, TORZEWSKI, Janusz, WACHOWSKI, Marcin, SŁABIK, Piotr, and MARANDA, Andrzej

Subjects
FRICTION stir welding, BUTT welding, TENSILE strength
Abstract

In this paper, the post-weld explosive hardening of a 5 mm AA7075-T651 plate welded via FSW was performed. To investigate the possibility of increasing FSW joint mechanical properties, the welded plate was explosively treated with four various explosive materials (ammonal, emulsion explosive, FOX-7, and PBX) in two different hardening systems. As part of the investigation, the observations of the surface and macrostructure of the treated plates were described. The obtained microhardness distribution allowed us to register the increase in hardness of the SZ up to 6%, but no increase in hardness of the LHZ was reported. In most cases, the influence of explosive treatment on the mechanical properties of the welded joint was disadvantageous as ultimate tensile strength and ductility were reduced. The only positive effect which was observed is the increase in the value of yield strength up to 27% corresponding to 77 MPa, achieved by explosive materials with detonation velocity below 3000 m/s. [ABSTRACT FROM AUTHOR]

Published
2023
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27. A Comparative Study on Laser Powder Bed Fusion of Differently Atomized 316L Stainless Steel

Author

Grzelak, Krzysztof, primary, Bielecki, Marcin, additional, Kluczyński, Janusz, additional, Szachogłuchowicz, Ireneusz, additional, Śnieżek, Lucjan, additional, Torzewski, Janusz, additional, Łuszczek, Jakub, additional, Słoboda, Łukasz, additional, Wachowski, Marcin, additional, Komorek, Zenon, additional, Małek, Marcin, additional, and Zygmuntowicz, Justyna, additional

Published
2022
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31. Additive Manufacturing of Plastics Used for Protection against COVID19—The Influence of Chemical Disinfection by Alcohol on the Properties of ABS and PETG Polymers

Author

Grzelak, Krzysztof, primary, Łaszcz, Julia, additional, Polkowski, Jakub, additional, Mastalski, Piotr, additional, Kluczyński, Janusz, additional, Łuszczek, Jakub, additional, Torzewski, Janusz, additional, Szachogłuchowicz, Ireneusz, additional, and Szymaniuk, Rafał, additional

Published
2021
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38. Comparison of Different Heat Treatment Processes of Selective Laser Melted 316L Steel Based on Analysis of Mechanical Properties

Author

Kluczyński, Janusz, primary, Śnieżek, Lucjan, additional, Grzelak, Krzysztof, additional, Oziębło, Artur, additional, Perkowski, Krzysztof, additional, Torzewski, Janusz, additional, Szachogłuchowicz, Ireneusz, additional, Gocman, Krzysztof, additional, Wachowski, Marcin, additional, and Kania, Bogusz, additional

Published
2020
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41. Effect of Process Parameter Modification and Hot Isostatic Pressing on the Mechanical Properties of Selectively Laser-Melted 316L Steel

Author

Kluczynski, Janusz, primary, Śnieżek, Lucjan, additional, Grzelak, Krzysztof, additional, Oziębło, Artur, additional, Perkowski, Krzysztof, additional, Torzewski, Janusz, additional, Szachogłuchowicz, Ireneusz, additional, Gocman, Krzysztof, additional, Wachowski, Marcin, additional, and Kania, Bogusz, additional

Published
2020
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46. The Potential of Al2O3–ZrO2-Based Composites, Formed via CSC Method, in Linear Infrastructure Applications Based on Their Mechanical, Thermal and Environmental performance.

Author

Zygmuntowicz, Justyna, Piotrkiewicz, Paulina, Gizowska, Magda, Tomaszewska, Justyna, Suchecki, Przemysław, Wachowski, Marcin, Torzewski, Janusz, and Żurowski, Radosław

Subjects
SLIP casting, CENTRIFUGAL casting, HARDNESS testing, RHEOLOGY, SUSTAINABLE construction
Abstract

Ceramic-ceramic composites have been prepared using the centrifugal slip casting method (CSC). The method has so far been mainly utilized in making ceramic-metal composites. Al2O3–ZrO2 composites have been obtained with different shares of ZrO2, i.e., 15, 50 and 75 vol pct, respectively. Prior to sintering the composite samples, the rheological properties of the casting slips were investigated and thermogravimetric tests were performed. Upon sintering, all three series of the ceramic composites showed a density close to 100 pct and no microcracks or delamination. Phase, microstructural and mechanical investigations were carried out to determine what effect the share of ceramics has on the composites produced. An increase in the share of ZrO2 in the Al2O3–ZrO2 composite leads to a reduction in the growth of Al2O3 grains and a decrease in the average hardness. Cross-sectional hardness testing of the composites showed no evident gradient in any of the samples. Life cycle analysis (LCA) results indicate that the further optimization of the composite formation process, including up-scaling, allows to obtain Al2O3–ZrO2-based pipes possessing more favorable environmental characteristics compared with materials conventionally used for linear infrastructure, which is important in light of the global transformation toward sustainable construction and the circular economy. [ABSTRACT FROM AUTHOR]

Published
2022
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