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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of Nickel on the Microstructure, Mechanical and Tribological Properties of Austempered Ductile Cast Iron for Steering Knuckle Applications
    Autorzy:
    Ramkumar, T.
    Madhusudhanan, S.
    Rajendran, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/356391.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austempered ductile iron
    fatigue
    impact
    Ni
    surface transition
    wear
    Opis:
    The research article address, the mechanical properties such as fatigue, impact strength and tribological properties of Austempered ductile iron (ADI) has been investigated. The samples of ADI iron were austenitized at 927°C for 2 hrs and later it was under austempering process for 2 hrs at a temperature range of 240°C to 400°C. Experiments under axial loading has been carried out on three different compositions (without Ni(X), 0.22wt.%Ni(X1), 0.34wt.%Ni(X2). Fabricated test bars were converted in to as per ASTM standard samples for different tests. In order to study the influence of chunky nickel morphology studies on fatigue life and impact strength were carried out on a second set of specimens without any microstructural defect. Metallurgical analyses were performed on all the samples of heat treated samples (AF - Ausferrite, MB - Mixed bainite, M - Martensite, RA - Retained Austenite and N - Nodule) were found and compared. It was found that a mean content of 22% of chunky nickel in the microstructure (with respect to total Ni content) influence considerably the fatigue and impact strength properties of the cast iron. Moreover tribological properties of the specimens were also studied under dry sliding conditions at various sliding speed and load. The wear resistance and coefficient of friction were found to increase with increase in load and sliding speed.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 15-25
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical behaviour and phase transition mechanisms of a shape memory alloy by means of a novel analytical model
    Autorzy:
    Carpinteri, A.
    Di Cocco, V.
    Fortese, G.
    Ronchei, C.
    Scorza, D.
    Vantadori, S.
    Zanichelli, A.
    Iacoviello, F.
    Natali, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/386617.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    fatigue behaviour
    phase transition mechanisms
    shape memory alloy
    tensile cyclic test
    x-ray diffraction analysis
    Opis:
    The aim of the present paper is to examine both the fatigue behaviour and the phase transition mechanisms of an equiatomic pseudo-elastic NiTi Shape Memory Alloy through cyclic tests (up to 100 loading cycles). More precisely, miniaturised dog-bone specimens are tested by using a customised testing machine and the contents of both austenite and martensite phase are experimentally measured by means of X-Ray diffraction (XRD) analyses. On the basis of such experimental results in terms of martensite content, an analytical model is here formulated to correlate the stress-strain relationship to the phase transition mechanisms. Finally, a validation of the present model by means of experimental data pertaining the stress-strain relationship is performed.
    Źródło:
    Acta Mechanica et Automatica; 2018, 12, 2; 105-108
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is Poland Ready for Transferable Fishing Concessions? Transition Fatigue with a Twist
    Autorzy:
    Figus, Elizabeth
    Powiązania:
    https://bibliotekanauki.pl/articles/520221.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Polska
    commercial fisheries
    transferable fishing concessions
    individual transferable quotas
    transition fatigue
    Common Fisheries Policy
    Opis:
    Commercial fishers in Poland demonstrate a unique version of “transition fatigue” (Rovelli, Zaiceva 2009). The situation leading to this phenomenon is related to three changes that occurred during the twentieth century. First, communist rule was marked by an orchestrated process of industrialization and a shift toward state-controlled fisheries after WWII. Second, political and organizational changes during the transition from a socialist to a free market economy in the nineties weakened social support and welfare structures in place during communism (and failed to replace them with something else). Third, accession to the European Union in May of 2004 introduced a new fisheries management strategy to the Polish fishing industry and the communities on the Baltic Sea coast. A regulatory vacuum created during the nineties has had negative effects on contemporary management strategies. EU-wide goals to reduce overcapacity since 2004 have significantly altered the composition of the Polish Baltic Sea fleet, while it is unclear that decommissioning schemes in Poland have had the positive results intended (Kuzebski, Marciniak 2009). A fishing closure and subsequent protests throughout the cod fleet in 2006 and 2007 underlined persistent problems in the management of Atlantic cod (Gadus morhua). In light of a potential shift to transferrable fishing concessions in the cod fleet, policy-makers should account for “transition fatigue” during the implementation process.
    Źródło:
    Roczniki Socjologii Morskiej; 2013, 22; 38-50
    0860-6552
    Pojawia się w:
    Roczniki Socjologii Morskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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