Volume 17, Issue 12 (2018)                   Modares Mechanical Engineering 2018, 17(12): 469-477 | Back to browse issues page

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Fahimi P, Baghani M, Zakerzadeh M R. Torsional modeling and experimental characterization of a shape memory alloy rod, using Brinson’s asymmetric model. Modares Mechanical Engineering. 2018; 17 (12) :469-477
URL: http://journals.modares.ac.ir/article-15-10960-en.html
1- School of mechanical engineering, College of engineering, University of Tehran, Tehran, Iran
2- School of mechanical engineering, University of Tehran
Abstract:   (1370 Views)
In this work, torsional modeling and experimental characterization of a Shape Memory Alloy (SMA) rod is investigated. Experimental tests of previous studies proved that different direction of loading is effective on torque-angle response of a rod. Accordingly, using improved Brinson’s model and converting it to a torsional model and referring a twist deformation in the clockwise direction to a positive twist and a twist deformation in the counter clockwise direction to a negative twist, the asymmetry effect on the rod is investigated. Assuming a linear strain through the cross section and then finding stresses, using the asymmetric Brinson model, and integrating the stresses through the cross section the torque-angle response of the rod is presented, by using a numerical procedure. The parameters for Brinson model, including phase transformation temperatures, are derived from experimental tests and there is more than 95% agreement between the present model and experimental test. Regarding the results, a verification for the derived parameters is presented and a parametric study on SMA rod is considered. The average error of asymmetric and symmetric models with respect to the experimental tests are 5% and 15% respectively. Moreover, hysteresis inner loops are studied and asymmetric model is compared to the experimental tests. The results show good agreement of the asymmetric model when compared to experimental tests.
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Article Type: Research Article | Subject: Stress Analysis
Received: 2017/07/13 | Accepted: 2017/11/14 | Published: 2017/12/22

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