Experimental characterization of free convection duringthermal  phase transformations in shape memory alloy wires

A Bhattacharyya; L Sweeney; M G Faulkner

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Experimental characterization of free convection duringthermal phase transformations in shape memory alloy wires

机译：Experimental characterization of free convection duringthermal phase transformations in shape memory alloy wires

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This paper has experimentally addressed thedetermination of the convection coefficient for a nichrome andnickel-titanium(NiTi) shape memory alloy(SMA) wire subjectedto constant load, heated by electrical current and cooled byfree convection (with the current switched off). The entirecycle of actuation is such that the temperature field isallowed to reach a steady state during heating, and the ambienttemperature during cooling. The experiments, in conjunctionwith a phenomenological model, suggest that the convectioncoefficient can be represented ash=a0+a1I, whereIis the electric current in the wire. The parameterhishighly sensitive to the material (nichrome or SMA) through thezeroth-order coefficient (a0) whereas it is weaklysensitive toI(or the strength of the heat source) throughthe first-order coefficient (a1). Further, for a givenmaterial,h(througha0) is strongly dependent onwhether the wire is being heated or cooled. This is in contrastwith the customary practice in the literature wherehis takento be identical for heating and cooling. Finally, a simple empiricalmodel in terms of a convection-like parameter,, isalso tested (with a view towards control applications) and isfound to be highly accurate in simulating the experimentalresults.

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来源
《smart materials and structures》 |2002年第3期|411-422|共页
作者
A Bhattacharyya; L Sweeney; M G Faulkner;
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Laboratory of Smart Materials and Devices,4-9 Mechanical Engineering Building,Department of Mechanical Engineering, University of Alberta,Edmonton, Alberta, Canada T6G 2G8;

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Experimental characterization of free convection duringthermal phase transformations in shape memory alloy wires

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