Development of a Magneto-Mechanical Actuator for the Measurement of Strain in Magnetic Shape Memory Alloys

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Authors
  1. MacKay, K.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
The Emerging Materials Section at DRDC Atlantic is involved in the development of magnetic shape memory alloys. As part of this research effort on the design, fabrication and characterization of magnetic shape memory alloys, the development of a device to measure the magneto-mechanical behaviour of these materials is required. This requires the re-design of the magneto-mechanical actuator device previously developed at DRDC Atlantic. This report describes the work by Martec Limited to redesign the magneto-mechanical actuator, during September to November 2003. The device measures strain in small (5-30 mm in length) specimens as a function of applied magnetic field, compressive stress and temperature. The design allows for load up to 500 lb to be applied while displacement is monitored using a LVDT. Magnetic fields of up to 1 Tesla can be applied to the specimen. Load is applied using a manual machine screw. The magneto-mechanical actuator was redesigned to correct problems with the existing device and facilitate the addition of new components. This included rearrangement of the load train to eliminate movement of the specimen, other than from specimen deformation, during loading; reducing friction due to misalignment and simplifying the mounting location of sensors, cooling devices, etc. Compressive loads are applied using a series of springs and measured with a load cell, with provisions for future introduction of a mechanical actuator. Strain is measured using the existing

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Keywords
Magnetic shape memory alloys;actuator;magneto-mechanical
Report Number
DRDC-ATLANTIC-CR-2005-120 — Contractor Report
Date of publication
01 May 2005
Number of Pages
30
DSTKIM No
CA026393
CANDIS No
524253
Format(s):
Electronic Document(PDF)

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