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Research Papers

Design of Adaptive Cores of Sandwich Structures Using a Compliant Unit Cell Approach and Topology Optimization

[+] Author and Article Information
Jiangzi Lin

School of Aeronautical, Mechanical, and Mechatronic Engineering, University of Sydney, NSW, 2006, Australiajohn.lin@aeromech.usyd.edu.au

Zhen Luo

School of Aeronautical, Mechanical, and Mechatronic Engineering, University of Sydney, NSW, 2006, Australiazluo@aeromech.usyd.edu.au

Liyong Tong1

School of Aeronautical, Mechanical, and Mechatronic Engineering, University of Sydney, NSW, 2006, Australialtong@aeromech.usyd.edu.au

1

Corresponding author.

J. Mech. Des 132(8), 081012 (Aug 18, 2010) (8 pages) doi:10.1115/1.4002201 History: Received March 04, 2009; Revised July 14, 2010; Published August 18, 2010; Online August 18, 2010

This paper presents a new method in designing the core layer of adaptive sandwich structures. The proposed design formulation treats the core layer as a compliant unit cell network while the unit cell network is synthesized by repeatedly linked identical compliant unit cells. Each unit cell is designed to possess shape adaptive functions independently and through the accumulation of the number of cells within the network, the global adaptive functions are accumulated also. Therefore, the network is capable of achieving large scale shape adaptations of complex profile with high fidelity. Topology optimization is used to design the compliant unit cell. Depending on the problem formulation, topology optimization can perform the simultaneous design of both the host material and the actuation material in the defined environment. This research includes a numerical case study to illustrate the technical aspects of this design philosophy. This is followed by the rapid prototyping of two scaled models and experimental validation.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

A simple unit cell network, (left) undeformed and (right) deformed

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Figure 6

Strain contour of actuation without S-shape actuator; left: type A and right: type B

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Figure 7

Final prototype product of three-cell compliant network: (a) type A and (b) type B

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Figure 8

Three-cell compliant network in single cell actuation

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Figure 9

Position probe setup for compliant structure testing

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Figure 10

Deformation of compliant network using FEA: (a) type A and (b) type B

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Figure 11

Temperature variation of Nitinol spring due to Joule’s heating

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Figure 12

Tip deflection angle versus temperature variation

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Figure 5

Post-processing of topology optimization; left: type A and right: type B

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Figure 4

Three-cell network layout before (top) and after (bottom) deformation

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Figure 3

Topologies for unit cell under various flexibility/stiffness priorities

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Figure 2

Design domain loading condition (left) and desired output (right)

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