Journal Published Online: 27 January 2015
Volume 44, Issue 4

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

CODEN: JTEVAB

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, RO
Pricop, Bogdan
Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi, RO
Suru, Marius-Gabriel
Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi, RO
Lohan, Nicoleta
Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi, RO
Bujoreanu, Leandru-Gheorghe
Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical Univ. of Iaşi, Iaşi, RO
Pages: 10
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Stock #: JTE20140138
ISSN: 0090-3973
DOI: 10.1520/JTE20140138