Results of an experimental and analytical study on the free bending recovery of shape memory alloy strips are presented. Nitinol strips have been trained to memorize a bending shape and the best recovery performances have been obtained by heat-treating at 450 °C for 25 minutes. Free recovery has been observed during heating in an Ethylene Glycol based water solution and curvature data have been acquired by means of digital image analysis. To simulate free recovery, the Euler-Bernoulli beam model has been considered together with a one-dimensional phenomeno- logical constitutive equation for shape memory alloys. The calculated relations between the applied moment, the curvature and the temperature show good agreement with experimental data.
Bending properties of heat-treated NiTi strips for actuation of smart reinforced beams
RIZZONI, Raffaella;MERLIN, Mattia;CASARI, Daniele
2011
Abstract
Results of an experimental and analytical study on the free bending recovery of shape memory alloy strips are presented. Nitinol strips have been trained to memorize a bending shape and the best recovery performances have been obtained by heat-treating at 450 °C for 25 minutes. Free recovery has been observed during heating in an Ethylene Glycol based water solution and curvature data have been acquired by means of digital image analysis. To simulate free recovery, the Euler-Bernoulli beam model has been considered together with a one-dimensional phenomeno- logical constitutive equation for shape memory alloys. The calculated relations between the applied moment, the curvature and the temperature show good agreement with experimental data.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
