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    Wyświetlanie 1-6 z 6
    Tytuł:
    Laser-beam welding impact on the deformation properties of stainless steels when used for automotive applications
    Autorzy:
    Evin, E.
    Tomáš, M.
    Vyrostek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386671.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    stainless steel
    strength
    stiffness
    deformation work
    tensile test
    3-point bending
    stal nierdzewna
    wytrzymałość
    sztywność
    odkształcenia
    próba rozciągania
    gięcie 3-punktowe
    Opis:
    Materials other than standard and advanced high strength steels are remarkable for the thin-walled structures of the car-body in recent years in order to safety enhancement, weight and emission reduction, corrosion resistance improvement. Thus, there are presented in the paper the deformation properties of laser welded austenitic AISI 304 and ferritic AISI 430 stainless steels compared to these one measured for the high strength low alloyed steel H220PD. The properties were researched by tensile test and 3-point bending test with fixed ends on specimens made of basic material and laser welded one. The specimens were welded by solid state fiber laser YLS-5000 in longitudinal direction (the load direction). The deformation properties such as strength, stiffness and deformation work were evaluated and compared. The strength and stiffness were calculated from tensile test results and the deformation work was calculated from both, tensile test and 3-point bending test results. There has been found only minor effect of laser welding to the deformation properties for high strength low alloyed steel H220PD and austenitic stainless steel AISI 304. Otherwise, the laser welding strongly influenced the deformation work of the ferritic stainless steel AISI 430 as well as the elongation at tensile test.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 3; 189-194
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Fe-Zn coated steel sheets tribological characteristics
    Studium charakterystyk tribologicznych blach stalowych z powłokami Fe-Zn
    Autorzy:
    Evin, E.
    Tomáš, M.
    Semjon, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/189425.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Fe-Zn coatings
    steel sheets
    coating morphology
    friction coefficient
    numerical simulation
    powłoki Fe-Zn
    blachy stalowe
    morfologia powłoki
    współczynnik tarcia
    symulacja numeryczna
    Opis:
    This paper presents the results of a study of the tribological characteristics of Fe-Zn coated steel sheets. Experimental research was done using coatings with different alloying – under alloyed, optimal and slightly pre-alloyed. The alloying level was evaluated by phase composition and the percentage of Fe in the coating. Tribological properties such as surface microgeometry, abrasion, and friction coefficient were analysed. The experimental results of strip drawn test were used for the verification of numerical simulation. Based on numerical simulation results, characteristics has been determined.
    Artykuł przedstawia wyniki badań charakterystyk tribologicznych blach stalowych z powłokami Fe-Zn. Badania eksperymentalne zostały wykonane dla powłok o różnym składzie stopu – z niską zawartością żelaza, o składzie optymalnym i z powłoką wstępną. Tworzenie stopu było oceniane przez kompozycję fazową i zawartość procentową Fe w powłoce. Własności tribologiczne, jak mikogeometria powierzchni, zużycie ścierne, współczynnik tarcia były analizowane z punktu widzenia formowalności. Wyniki testów paskowych posłużyły do weryfikacji symulacji numerycznej tego testu. Na bazie wyników symulacji numerycznej określono naciski stykowe na promieniu matrycy ciągowej.
    Źródło:
    Tribologia; 2013, 1; 35-46
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The wettability, mechanical and antimicrobial properties of polylactide/montmorillonite nanocomposite films
    Autorzy:
    Rapacz-Kmita, A.
    Pierchała, M. K.
    Tomas-Trybuś, A.
    Szaraniec, B.
    Karwot, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307050.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    montmorylonity
    nanokompozyty
    właściwości antybakteryjne
    właściwości mechaniczne
    montmorillonite
    nanocomposite films
    antibacterial properties
    mechanical properties
    Opis:
    The aim of this study was to evaluate the effect of the not activated (unmodified) montmorillonite (MMT) filler on the antibacterial properties of polymer nanocomposites with a biodegradable polylactide (PLA) matrix. The subject of research was selected to verify the reports on the lack of antibacterial properties of unmodified montmorillonite in nanocomposites and to investigate the potential condition of their manufacturing which are decisive for the resulting properties. Evaluation of antibacterial and mechanical properties of both the starting materials and the obtained nanocomposites filled with layered silicates, as well as the wettability of the materials measured by a sitting drop method, was made on samples in the form of a film. The results show that the surface wettability of the polymer nanocomposites did not exhibit significant change compared to the film of neat PLA. However, a significant improvement in the mechanical and antimicrobial properties of the nanocomposite films obtained in a specific solvent casting process of the nanocomposite preceded by exfoliation of the film in an ultrasonic homogenizer was demonstrated. The antibacterial activity against Gram-positive bacteria Staphylococcus aureus and Enterococcus faecalis was also observed, and moreover, the montmorillonite-containing films revealed a zone of inhibition of bacterial growth when tested against the lactose-positive bacteria of the Enterobacteriaceae family, which are present in the waste water. The advantageous properties of the obtained PLA/MMT nanocomposites suggest, that the unmodified montmorillonite may be potentially used as filler for polymer films in the packaging industry.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 4; 25-33
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concurrent validity and reliability of proprietary and open-source jump mat systems for the assessment of vertical jumps in sport sciences
    Autorzy:
    Pueo, B.
    Jimeney-Olmedo, J. M.
    Lipińska, P.
    Buśko, K.
    Penichet-Tomas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307394.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sportowiec
    skoki
    sport
    test
    athlete
    jump
    open-hardware
    sports
    switch
    Opis:
    Vertical jump tests are used to assess lower-limb power of athletes in sport sciences. Flight time measurement with jump-mat systems is the most common procedure for this purpose. The aim of this study was to analyze the concurrent validity and reliability of two proprietary systems (Globus and Axon) and an open-source system (Chronojump). Methods: A conditioning electric circuit governed by a controlled wave generator is designed to substitute athletes jumping on a physical mat. In order to look for possible differences associated to timekeeping by each microcontroller device, all three systems are fed by the circuit simultaneously. Results: Concurrent validity was high for the three systems. Standarized typical error of estimate (TEE) was trivial, according to MBI interpretation, as well as perfect Pearson correlation coefficient. Reliability was assessed using coefficient of variation of flight time measure, resulting in 0.17–0.63% (0.05–0.12 cm) for Globus, 0.01% (0.09 cm) for Chronojump and 5.65–9.38% (2.15–3.53 cm) for Axon. These results show that all jump-mat system produced nearly identical measures of flight time so they can be considered valid and reliable for practical purposes. In comparison, Chronojump showed the best performance whereas Axon showed enough variability and disagreement to pose a problem in testing elite athletes. Conclusions: These experiments show that open-source jump mats are as valid and reliable as their proprietary counterparts at a lower cost. Therefore, practitioners can be confident in using Globus or Chronojump systems to test athletes’ jump height because of their negligible errors and Axon system to monitor general population.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 3; 51-57
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray diffraction microstructural analysis of swelling by ethylene glycol in two reference clay minerals
    Autorzy:
    García Tomás, F.
    Kojdecki, M.
    Pardo, P.
    Ibańez, R.
    Álvarez Larena, A.
    Bastida, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1152823.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Vj
    61.72.Dd
    Opis:
    Kaolinite and montmorillonite are two clay minerals with different structures: dioctahedral 1:1 without layer charge and dioctahedral 2:1 with low layer charge. X-ray-diffraction microstructural analysis of two fractions of two reference clays (with kaolinite or montmorillonite) from the Clay Minerals Society Source Clay Repository were performed by the Voigt function method to provide microstructural data not available in the baseline studies of this Repository. A rough agreement was found between crystallite sizes determined from X-ray diffraction patterns and from images by field-emission scanning electron microscopy. In addition, the influence of swelling by ethylene-glycol on crystallite size was studied by the mentioned method. Two factors were found to affect the crystallite size variation in ethylene-glycol-treated clay minerals: (i) the increase of the unit cell in [001] direction due to the interlayer absorption of ethylene glycol molecules in the case of swelling minerals and (ii) the physisorption at the surfaces of the crystallites. Both effects operate in the case of montmorillonite, whereas just the latter one is expected in kaolinite.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 876-879
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new plesiosaur from the Lower Jurassic of Portugal and the early radiation of Plesiosauroidea
    Autorzy:
    Puertolas-Pascual, E.
    Marx, M.
    Mateus, O.
    Saleiro, O.
    Fernandes, A.E.
    Marinheiro, J.O.
    Tomas, C.
    Mateus, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082325.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Plesiosauria
    radiation
    Sinemurian
    Jurassic
    Iberian Peninsula
    Europe
    Opis:
    A new plesiosaur partial skeleton, comprising most of the trunk and including axial, limb, and girdle bones, was collected in the lower Sinemurian (Coimbra Formation) of Praia da Concha, near São Pedro de Moel in central west Portugal. The specimen represents a new genus and species, Plesiopharos moelensis gen. et sp. nov. Phylogenetic analysis places this taxon at the base of Plesiosauroidea. Its position is based on this exclusive combination of characters: presence of a straight preaxial margin of the radius; transverse processes of mid-dorsal vertebrae horizontally oriented; ilium with sub-circular cross section of the shaft and subequal anteroposterior expansion of the dorsal blade; straight proximal end of the humerus; and ventral surface of the humerus with an anteroposteriorly long shallow groove between the epipodial facets. In addition, the new taxon has the following autapomorphies: iliac blade with less expanded, rounded and convex anterior flank; highly developed ischial facet of the ilium; apex of the neural spine of the first pectoral vertebra inclined posterodorsally with a small rounded tip. This taxon represents the most complete and the oldest plesiosaur species in the Iberian Peninsula. It is also the most complete, best preserved, and oldest marine vertebrate in the region and testifies to the incursion of marine reptiles in the newly formed proto-Atlantic sea, prior to the Atlantic Ocean floor spreading in the Early Cretaceous.
    Źródło:
    Acta Palaeontologica Polonica; 2021, 66, 2; 369-388
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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