Comportements Dynamiques des Micro-Actionneurs d'Alliage à Mémoire de Forme Sous une Force Constante

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Authors
  1. Boissonneault, O.
  2. Wong, F.C.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);Numerica Technologies Inc, Quebec City (QUE)
Abstract
Superior performance is a key goal in weapons design. Smart bombs and missiles and future guided weapons need to offer longer stand-off capability, higher velocity and accuracy and smaller occupied volume to ensure overwhelming dominance in any military conflict. To achieve long-term performance objectives, the research community has undertaken development of smart structures and active flow technologies to miniaturize the flight control devices now used in their weapons. The concept is based on the idea of controlling the flow structure around the body with small control actuation systems that are placed at critical locations in the flow. Shape memory alloys (SMA) offer the opportunity to create compact, solid-state actuation systems because of their ability to convert electrical energy into mechanical energy through Joule heating. The critical stress-temperature state diagram for a 100 micron SMA wire was measured with a Rheometrics RSA II over the martensite start to austenite finish temperature range. An experimental parametric study examined the trade-off between actuation rate and amplitude and power consumption. Higher rates were obtained using short, intense tension pulses. The SMA wire was also tested to understand its behaviour under fatigue and quasi-static conditions. Comparison between the hybrid SMA model predictions and the experimental tension pulse data shows that the model is able to reproduce the experimental results.

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Report Number
DRDC-VALCARTIER-TM-2006-402 — Technical Report
Date of publication
01 Dec 2006
Number of Pages
60
DSTKIM No
CA028715
CANDIS No
526791
Format(s):
CD ROM

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