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Research Papers

Optimum Discrete Location of Shape Memory Alloy Wire for Enhanced Actuation of a Compliant Link

[+] Author and Article Information
A. Banerjee, B. Bhattacharya, A. K. Mallik

Department of Mechanical Engineering, IIT Kanpur, Uttar Pradesh 208016, India

J. Mech. Des 132(2), 021001 (Jan 14, 2010) (7 pages) doi:10.1115/1.4000643 History: Received January 27, 2009; Revised September 24, 2009; Published January 14, 2010; Online January 14, 2010

For discrete actuation with shape memory alloy (SMA) wires, the actuation moment can be controlled by changing the amount of wire offset. Increasing offset not only enhances the actuating moment, but also demands larger displacement capability of the actuator. In this paper, large deflection of a cantilever beam actuated by a SMA wire has been investigated. Both the theoretical and experimental results reveal the existence of an optimum offset maximizing the end deflection. The optimum offset depends on the flexural stiffness of the beam, SMA wire properties, and the input actuation level.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Deformed beam element under discrete actuation

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Figure 2

A deformed cantilever beam due to discrete actuation using a SMA wire

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Figure 3

End forces and moments applied on the beam by the SMA wire

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Figure 4

Stress strain relation of the SMA obtained using the two analyses

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Figure 5

Typical phase diagram of the shape memory alloy

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Figure 6

Transformation temperatures of the SMA wire obtained from the DSC experiment

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Figure 7

Detailed experimental setup

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Figure 8

SMA attached cantilever beam (experimental setup)

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Figure 9

Experimentally observed end deflection of Beam-3 for multiple cycles

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Figure 10

Maximum end deflections of Beam-1 (in Table 2) for various offset values

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Figure 11

Maximum end deflections of Beam-2 (in Table 2) for various offset values

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Figure 12

Maximum end deflections of Beam-3 (in Table 2) for various offset values

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Figure 13

Effect of external load on the optimum offset of Beam-2 in Table 2

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Figure 14

Maximum end deflections (of Beam-1 in Table 2) for various offset values with different Ca(MPa/°C)

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Figure 15

Maximum end deflections (of Beam-2 in Table 2) for various prestrain values of the SMA

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Figure 16

Optimum offset for different flexural rigidities and actuation temperatures

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Figure 17

Deformed beam configurations for different values of offset

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Figure 18

SMA actuated beam in the presence of external load

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