Modèle Numérique Hybride Macro-Micro Mécanique d'Alliage à Mémoire de Forme

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Authors
  1. Boissonneault, O.
  2. Wong, F.C.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);Ecole de Technologie Superieure, Montreal QUE (CAN)
Abstract
Aeronautics is interested more than ever in the use of intelligent materials since they make it possible to replace certain components with smaller, more compact mechanisms. Shape memory alloys have a promising future in aeronautical actuation applications because they offer a very high force to weight ratio. However, the behaviour of shape memory alloys is complex. It has hysteresis and is largely influenced by temperature variations. Because it is not easy to predict its behaviour, the design of mechanisms using this material is very difficult. To help the designer, the development of an effective model which simulates the behaviour of a shape memory alloy is necessary. This report describes the development of a new hybrid constitutive model that predicts the shape memory and superelastic effects. The model uses a phenomenological kinetics approach for its simplicity and a micromechanics approach to simulate the behaviour of the material due to the texture of the grains. The mechanical model is combined with a heat transfer model to investigate the behaviour of a thermally activated actuator. A parametric study was carried out to examine the sensitivity of the output force and displacement parameters to the input material property and power parameters. It was found that fast acting actuators need low thermal resistance and low ambient temperatures. The hybrid model was validated by experimentation with a test bench that was equipped with a 0.5 mm dia. nitinol wire, load cel

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Report Number
DRDC-VALCARTIER-TR-2006-036 — Technical Report
Date of publication
01 Dec 2006
Number of Pages
152
DSTKIM No
CA028714
CANDIS No
526787
Format(s):
CD ROM

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