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Analysis of Torsional Strength of Pa2200 Material Shape Additively with the Selective Laser Sintering Technology

Bernaczek Jacek, Dębski Mariusz, Gontarz Małgorzata, Grygoruk Roman, Józwik Jerzy, Kozik Bogdan, Mikulski Piotr

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 2

12--24

EN

The purpose of the undertaken research work is to analyze the torsional strength of standard samples with a circular cross-section, produced additively using the SLS (Selective Laser Sintering) technique – sintering PA2200 polyamide powders. The studies conducted so far have not included a static torsion test, the results of which are crucial for parts such as machine shafts, hubs, couplings, etc. Hence the idea of conducting the research in question. The samples were made in different settings relative to the machine's working platform and subjected to post-processing in two variants – by water-soaking and furnace-heating – in order to determine the influence of the orientation of the model in the manufacturing process and the type of post-processing on torsional strength. The produced samples were additionally subjected to a preliminary dimensional and shape verification due to the significant impact of the accuracy of the models in the SLS process on the operation of the above-mentioned machine parts. Based on the analysis of the test results, it was found that the highest torsional strength was determined for the furnace-heated samples. In addition, the highest mapping accuracy was found for models positioned vertically in relation to the machine's working platform.

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Applications of newly developed nanostructural and microporous materials in biomedical, tissue and mechanical engineering

Dobrzański L. A.

Archives of Materials Science and Engineering

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2015

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Vol. 76, nr 2

53--114

EN

Purpose: The purpose of the paper is to present the main results of own research in 3 principal aspects indicating that the research is up to date and modern. This relates to nanotechnologies, modern biomedical materials and rapid manufacturing techniques used for the production of, in particular, microporous materials applied for medical and dental purposes. The paper comprises the explanation of structural mechanisms and phase transformations taking place in newly created engineering nanostructural and microporous materials under the influence of the applied, advanced technological processes newly developed, and especially nanotechnological processes, using the most modern scientific and research equipment being at disposal of modern materials engineering, in particular with the common use of high-resolution transmission electron microscopy (HRTEM). The results of investigations into the formation of the structure and surface properties results according to a different thickness scale of coatings or surface zone, from several hundred nanometres to several millimetres, are presented in the paper, including PVD and CVD coatings and laser treated surface on the steels and light alloys substrates. The paper also describes the nanostructural effects in solid materials, and especially the counteraction of cracking of new-developed high-manganese austenite steels Fe-Mn-Si-Al by twinning or/and martensitic transformation induced by the cold plastic deformation. The article also outlines the results of research of the development of special micro and nanocomposite materials designed mainly for use in regenerative medicine and regenerative dentistry. The studies of the structure and the properties of newly obtained materials and originally developed technologies are included to present the author’s contribution into materials science, nanotechnology, surface engineering and biomedical engineering including the usefulness of the newly developed nanoengineering materials and their applicability, in particular, in regenerative medicine, as well as tissue engineering. The described outcomes of the research constitute a basis for creating, apart from rigid porous implant-scaffolds, an innovative generation of rigid and elastic biological-engineering composite materials for regenerative medicine. Design/methodology/approach: The article discusses the key aspects of own research performed over the last decade in scope of nanotechnologies, modern biomedical materials and rapid manufacturing techniques used for the fabrication of, in particular, microporous materials applied for medical and dental purposes. The conditions for the performance of the research according to the scope mentioned were ensured by implementation of investment projects for constructing and equipping research and didactic laboratories in scope of nanotechnology, technologies of material processes and computational materials science, including LANAMATE (2010-2014) and MERMFLEG (2010-2013), and also BIOFARMA (2010-2012). Practical implications: The obtained materials and technologies are of high practical importance, which was confirmed in many cases with the results of laboratory tests and investigations at a semi-technical scale, and in some cases with the initiation of implementation works. The results of research in scope of bioengineering and dental engineering may find their applications in tissue engineering, in bone surgery, for threedimensional tissue scaffolds and in dentistry or oncology, to replace the natural tissue removed because of a cancer with the possibility of applying a therapeutic agent. Originality/value: The present paper is the original report from a personal own research and explains the concept, scope and results of own research of a new obtained microporous and nanostructural materials and coatings, including hybride solid-porous products and newly obtained materials processing and additive technologies. Some of the mentioned research results are protected by patents or patent applications, and many of them were awarded over 60 prizes and medals at international fairs of innovation, invention and rationalisation in many countries.

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Influence of technological parameters on additive manufacturing steel parts in Selective Laser Sintering

Król M., Kujawa M., Dobrzański L.A., Tański T.

Archives of Materials Science and Engineering

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2014

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Vol. 67, nr 2

84--92

EN

Purpose: The investigations have been carried out on test pieces of 316L stainless steel parts fabricated by Selective Laser Sintering technique. The effect of selective laser sintering parameters such as power output, laser distance between the points sintered metal powder during additive manufacturing as well as the orientation of models relative to the laser beam and substrate on the roughness, surface morphology and wear resistance of manufactured models were performed. Design/methodology/approach: To fabricate 316L stainless steel parts, the method using selective laser sintering (SLS) technique, using Renishaw AM 125 machine is utilised. Wear resistance, roughness and surface morphology of SLS produced samples prepared via different process parameters are investigated. Findings: The results show that the wear resistance and surface morphology are strongly influenced by orientation of the parts relative to the laser beam, power output of laser and laser distance between the points sintered metal powder during additive manufacturing. Research limitations/implications: In the nearest future, studies will be conducted to establish influence of laser parameters such as scan speed, focus offset, exposure time, diameter of laser beam and hatch parameters such as hatch type and hatch distance on the quality and density of AM steel parts. Practical implications: Stainless steel is one of the most popular materials used for selective laser sintering (SLS) processing to produce nearly fully dense components from 3D CAD models. Reduction of surface roughness is one of the key research issues within the additive manufacturing technique SLS, since one of the major cost factors is the post processing of surfaces by means of milling, turning, grinding and polishing. Originality/value: This paper can serve as an aid in understanding the importance of technological parameters on quality and wear resistance of manufactured AM parts made by SLS technique.

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Zastosowanie wybranych metod przyrostowych w medycynie

Wyszyński D., Janusy M.

Mechanik

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2013

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R. 86, nr 8-9

664--667

PL

Przedstawiono przegląd wybranych przyrostowych metod wytwarzania w aspekcie ich zastosowań w medycynie. Głównym celem pracy było podkreślenie dynamicznego rozwoju Rapid Prototyping, Rapid Tooling i Rapid Manufacturing. Są to metody, które czerpią m.in. z inżynierii materiałowej, biologii i medycyny. Opisano i porównano kilka wybranych metod. Przedstawione zastosowania i ich potencjał mogą wnieść ogromny wkład w rozwój chirurgii, dać nadzieję pacjentom, którzy oczekują komfortowych, w pełni funkcjonalnych protez oraz zwiększyć szanse przeżycia osób oczekujących na transplantację narządów.

EN

The paper presents an overview of selected additive manufacturing methods in aspect of medical applications. The main goal of the work was emphasizing dynamic development of Rapid Prototyping and Rapid Tooling methods assisted by achievements of materials science, biology, medicine and so called Hi-Tech. Several selected methods were described and compared. The new trends of development toward medical area were presented. Described concepts bring huge potential of application and hope for patients waiting for transplantation.