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    Volume 44, Issue 4 (July 2016)

    Study of Temperature Memory Effect During the Thermal Cycling in Hydraulic Systems

    (Received 28 March 2014; accepted 16 December 2014)

    Published Online: 12 July 2016

    CODEN: JTEVAB

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    Abstract

    The effects of thermal cycling in an experimental hydraulic installation of trained shape memory alloy actuators are discussed. After being trained in air for up to 500 flection–deflection cycles during cooling–heating, respectively, with a load fastened at their free ends, the lamellar elements developed two way shape memory effect by reducing their curvature during heating and by recovering it during cooling. Temperature variations versus time were recorded during thermal cycling performed in oil, revealing the influences of: (i) the number of training cycles, (ii) overheating caused by oil thermal-inertia, and (iii) heating interruption during martensite reversion to parent phase. The effects of the number of training cycles, corroborated with heating interruption, were revealed by differential scanning calorimetry both before and after functioning in oil. Heating interruption, associated with temperature memory effect, caused the occurrence of two martensite populations during subsequent cooling, as substantiated by optical and atomic force microscopy.


    Author Information:

    Vitel, Gigi
    “Axinte Uricariul” School, Scânteia, jud. Iaşi,

    Pricop, Bogdan
    Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi,

    Suru, Marius-Gabriel
    Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi,

    Lohan, Nicoleta Monica
    Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi,

    Bujoreanu, Leandru-Gheorghe
    Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi,


    Stock #: JTE20140138

    ISSN:0090-3973

    DOI: 10.1520/JTE20140138

    Author
    Title Study of Temperature Memory Effect During the Thermal Cycling in Hydraulic Systems
    Symposium ,
    Committee B05