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
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Deformed beam element under discrete actuation

Grahic Jump Location
Figure 2

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

Grahic Jump Location
Figure 3

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

Grahic Jump Location
Figure 4

Stress strain relation of the SMA obtained using the two analyses

Grahic Jump Location
Figure 5

Typical phase diagram of the shape memory alloy

Grahic Jump Location
Figure 6

Transformation temperatures of the SMA wire obtained from the DSC experiment

Grahic Jump Location
Figure 7

Detailed experimental setup

Grahic Jump Location
Figure 8

SMA attached cantilever beam (experimental setup)

Grahic Jump Location
Figure 9

Experimentally observed end deflection of Beam-3 for multiple cycles

Grahic Jump Location
Figure 10

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

Grahic Jump Location
Figure 11

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

Grahic Jump Location
Figure 12

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

Grahic Jump Location
Figure 13

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

Grahic Jump Location
Figure 14

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

Grahic Jump Location
Figure 15

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

Grahic Jump Location
Figure 16

Optimum offset for different flexural rigidities and actuation temperatures

Grahic Jump Location
Figure 17

Deformed beam configurations for different values of offset

Grahic Jump Location
Figure 18

SMA actuated beam in the presence of external load



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In