MEMS Based Acoustic Thremomechanical Characterization of Aluminum 6061-T651 Beams

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Authors
  1. Rinaldi, G.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
Temperature based testing is an important tool in determining the mechanical characteristics of structures. Metallic structures such as aluminum beams respond to high and low temperatures by expanding or contracting accordingly. Hence, the structure under goes changes in geometry that can influence its performance. Similarly, the elastic property of the material has a temperature dependence that contributes significantly to the overall mechanical qualities of the material. These thermally induced changes in geometrical and elastic parameters can be monitored through experimentation. In this work, a method based on flexural frequency response is described in which the variation in the experimental 5th natural frequency under thermal loading is employed to extract the coefficient of thermal dependence of Young’s modulus. This coefficient is then employed in the theoretical model to validate the experimental 2nd, 3rd, 4th and 5th natural frequencies of the aluminum beam. A micro-electro-mechanical-systems based microphone is used to monitor the frequency response of the vibrating beam. The theoretical model is based on a free-free boundary supported beam from which the natural frequencies are obtained. Constant geometry and constant elasticity models are also presented and compared. For demonstration purposes the proposed method is applied to an aluminum 6061-T651 beam. Experimental results are good agreement with the theoretical formulation.

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Report Number
DRDC-ATLANTIC-TM-2009-080 — Technical Memorandum
Date of publication
01 Sep 2009
Number of Pages
48
DSTKIM No
CA033100
CANDIS No
532383
Format(s):
Electronic Document(PDF)

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