Acta Mechanica Slovaca最新文献_第4页

Methodology and Subsequent Analysis of Polymer Filament Production from PEEK Material With a Ceramic Admixture 含陶瓷添加剂的PEEK材料生产聚合物长丝的方法及后续分析

Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2022.007

S. Lancoš, M. Kohan, M. Schnitzer, Gabriela Dancáková, T. Bálint, Svetlana Rusnáková, R. Hudák

{"title":"Methodology and Subsequent Analysis of Polymer Filament Production from PEEK Material With a Ceramic Admixture","authors":"S. Lancoš, M. Kohan, M. Schnitzer, Gabriela Dancáková, T. Bálint, Svetlana Rusnáková, R. Hudák","doi":"10.21496/ams.2022.007","DOIUrl":"https://doi.org/10.21496/ams.2022.007","url":null,"abstract":": The aim of the presented article is to describe the process of filaments production from the material of pure PEEK as well as from PEEK mixed with the ceramic component HA and TCP and subsequently its analysis. The analysis of the filament consisted in the analysis of the diameter of the produced filament, the distribution of the ceramic component in the produced filament, as well as the biological test of cytotoxicity after the extrusion process. In the analysis of the filament diameter, descriptive statistics were used to detect the thickness of the entire filament produced. Electron microscopy using SM and SEM modes was used to analyse the distribution of the ceramic component in the produced filament. The cytotoxicity biological assay was performed using the L929 cell line according to ISO 1099-5. The results of the filament diameter analysis show average values of pure PEEK of 1.7501 ± 0.032 mm and for PEEK with a ceramic component of 1.7503 ± 0.041 mm. Analysis of the distribution of the ceramic component showed irregular filler particles with a size of 1 to 2 μm in the produced filament. EDX analysis showed a distribution of calcium and silicon in the filament. The cytotoxicity assay showed higher values from the reference value using 100% and 75% extraction. From the presented analyses of the produced filament, it can be stated that the diameter of the filament meets the required quality for the 3D printing process. In terms of ceramic component distribution analysis, smaller clumps were detected but these clumps were evenly distributed in all samples. The cytotoxicity test showed that the extrusion process did not affect the cytotoxicity of the produced filament.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122548847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of the Safety Control of the Cooling System 冷却系统安全控制的设计

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2022.024

Johnshaida Shaik

引用次数: 0

Methods of Linearization of Nonlinear Dynamic System 非线性动态系统的线性化方法

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2021.030

E. Prada, Daxesh Dalal, D. Hroncová, M. Kelemen

引用次数: 0

Study of the Consequences of Changes in the Composition of Natural Gas 天然气成分变化的后果研究

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2023.001

K. Sikora

引用次数: 0

Design of an Individual Cover for a Lower Limb Prosthesis 下肢假体单个护套的设计

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2021.028

B. Štefanovič, Tomáš Breškovič, L. Bednarčíková, Svetlana Rusnáková, R. Hudák, J. Živčák

引用次数: 0

Optimization of Production Schedule Using Advanced Scheduling Tools for Green Production 利用先进的调度工具优化绿色生产的生产计划

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2022.006

P. Trebuna, M. Pekarcikova, M. Dic, J. Kopec

引用次数: 0

Control Design for Sorting Conveyor System 分拣输送系统控制设计

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2022.023

Oleksandr Postrygan

引用次数: 0

Plasma Nitriding and Its Effect on the Corrosion Resistance of Stainless Steel 1.4006 等离子体氮化及其对不锈钢1.4006耐蚀性的影响

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2021.022

M. Krbaťa, Robert Ciger

{"title":"Plasma Nitriding and Its Effect on the Corrosion Resistance of Stainless Steel 1.4006","authors":"M. Krbaťa, Robert Ciger","doi":"10.21496/ams.2021.022","DOIUrl":"https://doi.org/10.21496/ams.2021.022","url":null,"abstract":": The plasma nitriding (PN) technology was applied on the martensitic stainless steel 1.4006. The influence of PN on the corrosion resistance of selected material was investigated. The chemical composition of selected steel was verified using the Q4 TASMAN device. The PN process was performed using two stage nitriding procedure. After plasma cleaning procedure at 515 °C for 45 min in a nitriding atmosphere ratio 20H2:2N2 (l/h) was the first stage nitriding procedure performed at 520°C for 16 hours in a nitriding atmosphere ratio 25H2:5N2 (l/h) and followed by the second stage of nitriding procedure performed at 525°C for 4 hours in a nitriding atmosphere ratio 28H2:4N2 (l/h). The microstructure and mechanical properties of the nitride layers were studied using OES spectrometry, optical microscopy, and hardness testing. The depths of plasma nitride layers were also estimated using a cross-sectional microhardness profiles measurement. The corrosion resistance testing of PN stainless steel 1.4006 samples were carried out in a 5 % neutral sodium chloride solution (NSS) in accordance with ISO 9227 standard in the VLM GmbH SAL 400-FL corrosion chamber and visually evaluated. Microhardness and surface hardness of experimental samples were significantly increased, but the corrosion resistance remarkably decreased.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121179046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Best Manufacturing Orientation of Co-Cr-W-Si Dental Prosthetic Elements in the Selective Laser Melting Process Co-Cr-W-Si牙科修复体元件在选择性激光熔化工艺中最佳制造取向的研究

Acta Mechanica Slovaca Pub Date : 2022-06-01 DOI: 10.21496/ams.2023.003

Snehashis Pal, Janez Gotlih, I. Drstvenšek

{"title":"Investigation of the Best Manufacturing Orientation of Co-Cr-W-Si Dental Prosthetic Elements in the Selective Laser Melting Process","authors":"Snehashis Pal, Janez Gotlih, I. Drstvenšek","doi":"10.21496/ams.2023.003","DOIUrl":"https://doi.org/10.21496/ams.2023.003","url":null,"abstract":": It is well known that Selective Laser Melting (SLM) does not provide the same mechanical properties in all directions of the part. This is due to the microstructural grain orientation and pore shape in SLM products. Therefore, depending on the direction of the pressure applied to the SLM product, a different manufacturing orientation is required to achieve the best mechanical properties. Changing the microstructural grain orientation is difficult through SLM, but a process to reduce the size and number of the pores can be discovered through different combinations of manufacturing parameters. In prosthodontics, pressure is usually applied in the vertical direction, which leads to compression and bending of crowns with bridges. The compressive load can be easily absorbed in the crowns, but the bending force has a significant effect here. Therefore, a product with high tensile strength and high ductility is needed to survive longer. Considering these requirements, this study determined the best parameters for laser processing by SLM method to reduce porosity and improve mechanical strength and ductility of Co-Cr-W-Si alloy products. The result is a relative product density of 100% for cubic specimens and a yield strength, ultimate tensile strength, and elongation at break of the tensile specimens of 900 MPa, 1200 MPa, and 15%, respectively, obtained in specimen build-up in the Z direction with a laser power of 60 W and a scanning speed of 450 mm/s. Eventually, the best orientation for the production of dental prosthetic elements using the SLM process was","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129395367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Modeling Temperature Response Profile of MOSFET Chip with Heat Sink Parameters in Power Inverters 功率逆变器中基于散热器参数的MOSFET芯片温度响应曲线建模

Acta Mechanica Slovaca Pub Date : 2022-03-01 DOI: 10.21496/ams.2022.010

F. Onoroh, M. Ogbonnaya, U. Onochie

{"title":"Modeling Temperature Response Profile of MOSFET Chip with Heat Sink Parameters in Power Inverters","authors":"F. Onoroh, M. Ogbonnaya, U. Onochie","doi":"10.21496/ams.2022.010","DOIUrl":"https://doi.org/10.21496/ams.2022.010","url":null,"abstract":": Direct current to alternating current converter is applied in the conversion of renewable energy such as solar and wind energy. The switching operation is performed by metal oxide semiconductor field effect transistor chips (MOSFET), during the operation heat is generated and if the heat generated is not properly dissipated, it may lead to thermally induced failure. This research modelled the temperature profile of the MOSFET chip with geometrical properties of the heat sink to which they are attached. The model was implemented in a MATLAB environment to obtained optimal heat sink parameters which was solved numerically with ANSYS and experimentally tested in a 1.6 kW inverter. The maximum MOSFET temperature obtained analytically, numerically and experimentally are is 73.68°C, 81.44°C and 87.35°C at a pulse load of 1000W. The numerical and experimental results of the optimized heat sink temperatures show good correlation with 7% deviation at a pulse load of 1000W and an average deviation of 17% in the power range of 600W to 1000W which shows that the optimized heat sink for the MOSFET chips work well and the model can be deploy for rapid prototyping of power inverter.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115440588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0