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    Wyświetlanie 1-13 z 13
    Tytuł:
    Chosen Aspects of Quality Defects of ”Alphin” Inserts in Combustions Pistons
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/381700.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si casting alloy
    quality defect
    alphin inserts
    motor piston
    stop odlewniczy Al-Si
    wada jakości
    tłok silnikowy
    Opis:
    The chosen, typical causes of quality defects of cast-iron „alphin” rings embedded in aluminum cast are being presented in this paper. Diffusive joint of those inserts with the pistons casts is being used, due to extreme work conditions of destructive influence of the fuel mix and variable thermo-mechanical loads, which reign in the combustion motor working chamber.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 61-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization of AlSi17Cu5Mg Alloy after Time-thermal Treatment
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382327.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hypereutectic Al-Si alloy
    overheating
    thermal analysis
    crystallization process
    stop nadeutektyczny Al-Si
    przegrzanie
    analiza termiczna
    proces krystalizacji
    Opis:
    In the dissertation it has been shown, that so called “time-thermal treatment” (TTT) of the alloy in liquid state as overheating the metal with around 250°C above Tliq. and detailing it in temperature for 30 to 40 minutes has the influence on changing the crystallization parameters (Tliq., TEmin., TEmax., TE(Me), TSol.). It was ascertained, that overheating the AlSi17Cu5Mg alloy substantially above Tliq. results with microcrystalline structure. Evenly distributed in the eutectic warp primeval silicon crystals and supersaturated with alloying additives of base content (Cu, Mg, Fe) of α(Al) solution, ensures not only increase durability in ambient temperature, but also at elevated temperature (250°C), what due to it’s use in car industry is an advantage.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 83-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Mechanical Properties of AlSiCuMg Alloy after Thermo Processing
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/379577.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hypereutectic Al-Si alloy
    overheating
    CuP10 master alloy
    mechanical properties
    microstructure
    stop nadeutektyczny Al-Si
    przegrzanie
    stop CuP10
    właściwości mechaniczne
    Opis:
    In the dissertation it has been shown, that so called „time-thermal treatment” (TTT) of the alloy in liquid state, as overheating the metal with around 250°C above the Tliq. and detaining it in this temperature for around 30 minutes, improves the mechanical properties (HB, Rm, R0,2). It was ascertained, that overheating the AlSi17Cu5Mg alloy aids the modification, resulting with microcrystalline structure. Uniform arrangement of the Si primeval crystals in the warp, and α(Al) solution type, supersaturated with alloying elements present in the base content (Cu, Mg) assures not only increased durability in the ambient temperature, but also at elevated temperature (250°C), what is an advantage, especially due to the use in car industry.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 79-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Typical Quality Defects of the „Alphin” Inserts in Engine Pistons
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380070.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si cast alloy
    alphin inserts
    engine piston
    5M why method
    5 Why Method
    quality defect
    stop odlewniczy Al-Si
    tłok silnikowy
    metoda 5M why
    metoda 5 why
    wada jakości
    Opis:
    In the dissertation, the 5M Method, is being presented, of typical causes and consequences of quality defects of cast-iron inserts „alphin” embedded in aluminum cast. The diffusive connection of those rings, with pistons casts is being used, because of the extreme conditions in which they need to operate in, which are of high temperature and variable thermo-mechanical burden, which are in the working chamber of combustion engine.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 65-68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk Assessment of Defect Occurrences in Engine Piston Castings by FMEA Method
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/381883.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting defects
    casting quality management
    Pareto-Lorenz method
    FMEA process
    failure risk score
    wady odlewu
    zarządzanie jakością odlewów
    metoda Pareto-Lorenza
    proces FMEA
    ryzyko uszkodzeń
    Opis:
    The FMEA (Failure Mode and Effects Analysis) method consists in analysis of failure modes and evaluation of their effects based on determination of cause-effect relationships for formation of possible product or process defects. Identified irregularities which occur during the production process of piston castings for internal combustion engines were ordered according to their failure rates, and using Pareto-Lorenz analysis, their per cent and cumulated shares were determined. The assessments of risk of defects occurrence and their causes were carried out in ten-point scale of integers, while taking three following criteria into account: significance of effects of the defect occurrence (LPZ), defect occurrence probability (LPW) and detectability of the defect found (LPO). A product of these quantities constituted the risk score index connected with a failure occurrence (a so-called “priority number,” LPR). Based on the observations of the piston casting process and on the knowledge of production supervisors, a set of corrective actions was developed and the FMEA was carried out again. It was shown that the proposed improvements reduce the risk of occurrence of process failures significantly, translating into a decrease in defects and irregularities during the production of piston castings for internal combustion engines.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 107-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared imaging fourier transform spectrometer as the stand-off gas detection system
    Autorzy:
    Kastek, M.
    Piątkowski, T.
    Trzaskawka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220556.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas detection
    hyperspectral detection
    imaging Fourier-transform spectrometer
    stand-off detection
    Opis:
    The article presents the detection of gases using an infrared imaging Fourier-transform spectrometer (IFTS). The Telops company has developed the IFTS instrument HyperCam, which is offered as a short- or long-wave infrared device. The principle of HyperCam operation and methodology of gas detection has been shown in the paper, as well as theoretical evaluation of gas detection possibility. Calculations of the optical path between the IFTS device, cloud of gases and background have been also discussed. The variation of a signal reaching the IFTS caused by the presence of a gas has been calculated and compared with the reference signal obtained without the presence of a gas in IFTS's field of view. Verification of the theoretical result has been made by laboratory measurements. Some results of the detection of various types of gases has been also included in the paper.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 607-620
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aluminous porcelain degradation study using mechanoacoustic and microscopic methods
    Autorzy:
    Ranachowski, P.
    Rejmund, F.
    Ranachowski, Z.
    Pawełek, A.
    Piątkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/140868.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porcelana
    izolator ceramiczny
    emisja akustyczna
    analiza mikroskopowa
    degradacja struktury
    aluminous porcelain
    ceramic insulators
    insulator testing
    acoustic emission
    microscopic analysis
    structural degradation
    Opis:
    This experimental paper comprises the results of acoustic emission (AE), microscopic and ultrasonic measurements of samples subjected to slowly increasing compressive stress. On the basis of conducted measurements the successive stages of the material structural degradation have been recognized. The objects of study were samples made of C 120 aluminous porcelain. The investigated material has found at present the application in the fabrication of technical elements like overhead power line insulators. In the case of such objects, not only high mechanical strength, but especially elevated durability as well as operational reliability are required. The expected "life time" of net insulators during exploitation is about 40 years. The analysis of obtained mechanoacoustic dependences pointed out a complex mechanism of degradation of the material. Microscopic investigation of samples, which were stressed to different levels of load, enabled to specify the development of gradual growth of microcracks and successive crushing out of elements of the structure. These processes appear to be similar to the ageing processes occurring in the material during long period of exploitation under a working load. Three stages of the structure degradation were distinguished. The preliminary and subcritical ones show low or moderate intensity of AE signals and considerable variety for the particular samples. The critical stage directly precedes the destructtion of samples. Its range is relatively narrow and reveals the AE activity of high energy. The effectiveness of dispersive and fibrous reinforcement of modern aluminous porcelain C 120 type has been described. Structural strengthening by corundum grains and mullite needle shaped crystals improves mechanical parameters and distinguishes this material from typical aluminosilicate ceramics. The presented results enable drawing up the conclusions concerning the resistance of investigated material to the ageing degradation process development during long term operation.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 2; 109-128
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of factors determinant of siliceous electrical porcelain resistance to structural degradation
    Autorzy:
    Ranachowski, P.
    Ranachowski, Z.
    Kudela Jr., S.
    Pawełek, A.
    Piątkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351813.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porcelain insulating materials
    ageing processes
    acoustic emission (AE)
    optical microscopy
    Opis:
    The subject of this study was investigation of the factors that have a decisive influence on the resistance of siliceous porcelain to degradation processes. There was tested material C 110 type, which is widely used for the production of low-voltage (LV) elements such as insulators and bushings. On the basis of mechanical-acoustic and microscopic research of small-sized samples, which were subjected to compression, there were distinguished successive stages of degradation of the material structure. In the authors* opinion, they have a reference to the ageing process, taking place during many years of work under operating conditions. Thus, it was possible to assess the structural factors that determine the durability and reliability of LV electroinsulating elements. The results were related to electrical aluminous porcelains.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1489-1496
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanoacoustic and microscopic study of aluminous porcelain resistance to structural degradation
    Mechanoakustyczne i mikroskopowe badania odporności porcelany wysokoglinowej na degradację struktury
    Autorzy:
    Ranachowski, P.
    Rejmund, F.
    Ranachowski, Z.
    Pawełek, A.
    Piątkowski, A.
    Kudela, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/352978.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porcelana wysokoglinowa
    degradacja struktury
    emisja akustyczna
    analiza mikroskopowa
    aluminous porcelain
    structural degradation
    acoustic emission (AE)
    microscopic analysis
    Opis:
    The paper presents mechanoacoustic and microscopic testing of degradation processes of modern C 120 electrotechnical porcelain of domestic medium voltage line insulator. Samples of small dimensions, cut off from the rod of insulator, were subjected to compressive loading, with recording of acoustic emission descriptors. Microscopic analysis enabled determining the advancement of degradation effects. Three stages of the structure degradation were distinguished. The effectiveness of dispersive and fibrous reinforcement of modern aluminous porcelain C 120 type has been described. Structural strengthening by corundum grains and mullite needle shaped crystals improves mechanical parameters and distinguishes this material from typical aluminosilicate ceramics. The presented results enable drawing up the conclusions concerning the resistance of investigated material to the ageing degradation process development during long term operation.
    W pracy przedstawiono mechanoakustyczne i mikroskopowe badania procesów degradacji w nowoczesnym tworzywie porcelanowym rodzaju C 120 liniowego izolatora SN. Małogabarytowe próbki, wycięte z pnia izolatora, były quasi-statycznie ściskane z jednoczesną rejestracją deskryptorów emisji akustycznej. Badania mikroskopowe ściskanych próbek wykorzystano do opisu mechanizmu degradacji tworzywa. Wyróżniono trzy kolejne etapy degradacji struktury tworzywa. Stwierdzono wysoką krótko- i długotrwałą odporność materiału izolatora w porównaniu do typowych tworzyw rodzaju C 120. Jest to wynikiem skutecznego dyspersyjnego i włóknistego wzmocnienia struktury czerepu badanej porcelany
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 1127-1233
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real road network application of a new microsimulation tool: TRITONE
    Zastosowanie dla prawdziwej sieci dróg nowego narzędzia mikrosymulacji: TRITONE
    Autorzy:
    Giofre, V. P.
    Maciejewski, M.
    Merkisz-Guranowska, A.
    Piątkowski, B.
    Astarita, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/952928.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    traffic
    model of traffic flows
    road traffic simulator
    TRITONE
    ruch drogowy
    model przepływu ruchu
    symulator ruchu drogowego
    Opis:
    The aim of the paper is to carry out a comparative study of 13 different traffic flow models available in TRITONE, a new road traffic simulator that specializes particularly in quantitative road safety assessment. After a short introduction on a traffic flow modelling, a description of the TRITONE functionality is given and various types of behavioural models available in this tool are presented in brief. Then a part of Poznan (Poland) network that served as the study area, was illustrated. The following section lists all the models used in the research and provides a comparison of the results obtained with these models. The article ends with conclusions on the results’ quality of individual models.
    Celem pracy jest przeprowadzenie analizy porównawczej 13 różnych modeli przepływu ruchu dostępnych w TRITONE, nowym symulatorze ruchu drogowego, który specjalizuje się w szczególności w ilościowej ocenie bezpieczeństwa ruchu drogowego. Po krótkim wprowadzeniu na temat modelowania przepływu ruchu, podano opis funkcjonalności TRITONEi w skrócie różne typy modeli behawioralnych dostępnych w tym narzędziu. Następnie została zilustrowana część sieci Poznania, która służyła, jako obszar badań. Poniższy rozdział zawiera listę wszystkich modeli stosowanych w badaniach i przedstawia porównanie wyników uzyskanych z tych modeli. Artykuł kończy się wnioskami odnośnie, jakości wyników poszczególnych modeli.
    Źródło:
    Archives of Transport; 2013, 27-28, 3-4; 111-121
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the mullite hypothesis in respect of electrotechnical porcelains
    Ocena mulitowej teorii wzmocnienia w zastosowaniu do porcelan elektrotechnicznych
    Autorzy:
    Ranachowski, P.
    Rejmund, F.
    Ranachowski, Z.
    Pawełek, A.
    Piątkowski, A.
    Kudela Jr., S.
    Powiązania:
    https://bibliotekanauki.pl/articles/352850.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrotechnical porcelain
    porcelain degradation
    acoustic emission (AE)
    microscopic analysis
    porcelana elektrotechniczna
    degradacja porcelany
    emisja akustyczna (EA)
    analiza mikroskopowa
    Opis:
    The paper presents the evaluation of the mullite hypothesis explaining the strength of porcelains. There was researched the influence of the mullite phase on the short- and long-term mechanical strength of electrotechnical porcelain of different types (C 110, C 112, C 120 and C 130). The total mullite phase content, the size and distribution of precipitates and dispersed single crystals in the glassy matrix were considered. Mechanoacoustic and microscopic techniques as well as ultrasonic testing were used during the investigation. The role of the mullite phase in the increase of strength and resistance to aging processes of electrical porcelain of various types was described. Mullite hypothesis is valid in reference to siliceous (C 110), cristobalite (C 112) and aluminous C 120 type materials of a typical raw components content and phase composition. In the case of modern strengthened C 120 and C 130 type aluminous materials advantageous are only dispersed fine mullite needles. The precipitates of mullite phase, especially of bigger size, are undesirable.
    W pracy przedstawiono ocenę teorii mulitowej wzmocnienia porcelany, w odniesieniu do tworzyw elektrotechnicznych. Przedmiotem badań był wpływ fazy mulitowej na krótko- i długotrwałą wytrzymałość mechaniczną elektroporoelan rodzaju C 110, C 112, C 120 oraz C 130. Rozpatrywana była sumaryczna zawartość fazy mulitowej. wielkość i rozłożenie jej wydzieleń oraz niezaglomeryzowanych kryształów w osnowie szklistej. W badaniach wykorzystano metodę mechanoakustyczną, techniki mikroskopowe (MO i SEM) oraz metodę ultradźwiękową. Przedstawiono rolę fazy mulitowej w podwyższeniu odporności na procesy starzeniowe porcelany elektrotechnicznej różnego rodzaju. Stwierdzono słuszność teorii mulitowej w przypadku tworzyw kwarcowych (C 110), krystobalitowych (C 112) oraz wysokoglinowych rodzaju C 120 o typowym - tradycyjnym składzie surowcowym i fazowym. W zastosowaniu do nowoczesnych, wzmocnionych tworzyw wysokoglinowych rodzaju C 120 oraz porcelan rodzaju C 130 korzystnie działają rozproszone w osnowie, niezaglomeryzowane igłowe kryształy mulitu. Wydzielenia mulitu, zwłaszcza o większych rozmiarach, są niepożądane.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1177-1181
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermovision in the validation process of numerical simulation of braking
    Autorzy:
    Baranowski, P.
    Damaziak, K.
    Malachowski, J.
    Mazurkiewicz, L.
    Polakowski, H.
    Piatkowski, T.
    Kastek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220945.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermovision
    numerical models validation
    temperature measurement
    Opis:
    This article presents the validation process of a brake FE model by means of temperature measured on a special stand using infrared technology. Unlike many other publications, the authors try to show the interaction between measurement technology and numerical modeling rather than only nice, perfectly correlated graphs. Some difficulties in choosing and using validation parameters are also pointed out and discussed. Finally, results of FE analyses are compared with measured data, followed by explanation of applied numerical technology and estimation of validation process effectiveness.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 329-340
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plastic Instabilities Induced by the Portevin - Le Châtelier Effect and Fracture Character of Deformed Mg-Li Alloys Investigated Using the Acoustic Emission Method
    Autorzy:
    Pawełek, A.
    Piątkowski, A.
    Wajda, W.
    Skuza, W.
    Tarasek, A.
    Ranachowski, Z.
    Ranachowski, P.
    Ozgowicz, W.
    Kúdela, Jr.
    Kúdela, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/353865.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lightweight alloys
    acoustic emission
    fracture
    Portevin-Le Châtelier phenomenon
    twinning
    dislocations
    shear bands
    Opis:
    The results of the investigation of both mechanical and acoustic emission (AE) behaviors of Mg4Li5Al and Mg4Li4Zn alloys subjected to compression and tensile tests at room temperature are compared with the test results obtained using the same alloys and loading scheme but at elevated temperatures. The main aim of the paper is to investigate, to determine and to explain the relation between plastic flow instabilities and the fracture characteristics. There are discussed the possible influence of the factors related with enhanced internal stresses such as: segregation of precipitates along grain boundaries, interaction of solute atoms with mobile dislocations (Cottrell atmospheres) as well as dislocation pile-ups which may lead to the microcracks formation due to the creation of very high stress concentration at grain boundaries. The results show that the plastic flow discontinuities are related to the Portevin-Le Châtelier phenomenon (PL effect) and they are correlated with the generation of characteristic AE pulse trains. The fractography of broken samples was analyzed on the basis of light (optical), TEM and SEM images.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 897-904
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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