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TECHNICAL PAPERS

Fiber-Reinforced Membrane Models of McKibben Actuators

[+] Author and Article Information
W. Liu, C. R. Rahn

Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802

J. Appl. Mech 70(6), 853-859 (Jan 05, 2004) (7 pages) doi:10.1115/1.1630812 History: Received August 20, 2002; Revised April 28, 2003; Online January 05, 2004
Copyright © 2003 by ASME
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References

Figures

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McKibben actuator model
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Coordinate system definition
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Actuator shape (Γ=0.0,α=30 deg,l0=5.0): undeformed (thick solid), f=0.0 and p=3.2 (thin solid) and experimental (* ), f=5.0 and p=6.327054 (dash-dotted), and f=5.0 and p=0.9538596 (dotted)
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Strain versus pressure (α=30 deg,f=0.0,l0=5.0): solid (Γ=0.0), dashed (Γ=0.20), dash-dotted (Γ=0.35), and asterisk (Experiment). Circled point is shown in Fig. 4.
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Midpoint radius enlargement versus pressure (l0=5,Γ=0.0,α=30 deg):f=0.0 (solid), f=1.0 (dashed), f=2.0 (dotted), f=5.0 (dash-dotted), and experiment with f=0.54 (* ). Circled point is shown in Fig. 4.
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Fiber angle distribution (Γ=0.0,α=30 deg,f=0.0): solid (l0=5.0,p=3.2), dotted (l0=5.0,p=17.7), dash-dotted (l0=2.0,p=3.5), and dashed (l0=2.0,p=18.5)
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Fiber n1 (solid), membrane n1 (dashed), fiber n2 (dotted), and membrane n2 (dash-dotted) stress distributions (Γ=0.0,α=30 deg,f=0.0,l0=5.0,p=3.2)
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(a) Strain versus pressure, (b) midpoint radius enlargement versus pressure (l0=2.0,Γ=0.0,f=0.0):α=10.0° (dashed), α=20.0 deg (dotted), α=30.0 deg (dash-dotted), and α=40.0 deg (solid)
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Strain versus pressure (Γ=0.0,α=30 deg,f=0.0):l0=1.0 (dashed), l0=2.0 (dotted), l0=3.0 (dash-dotted), and l0=5.0 (solid)
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Strain versus pressure (l0=5,Γ=0.0,α=30 deg):f=0.0 (solid), f=1.0 (dashed), f=2.0 (dotted), and f=5.0 (dash-dotted)
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Strain versus pressure (l0=2.0,Γ=0.0): dashed (α=20.0 deg,f=1.0), dotted (α=20.0 deg,f=5.0), dash-dotted (α=40.0 deg,f=1.0), and solid (α=40.0 deg,f=5.0)
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Locked (β=54°44) strain ΔL* (solid) and midpoint radius enlargement ΔR* (dotted) versus initial fiber angle α. Numerical results for large p:ΔL (* ) and ΔR (○).
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(a) Strain versus pressure; (b) midpoint radius enlargement versus pressure (Γ=0.0,f=0.0):α=60 deg,l0=1.0 (solid), and α=75 deg,l0=0.5 (dash-dotted)

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