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Journal of Materials Engineering and Performance

Published in:

01-07-2011

Model and Simulation of an SMA Enhanced Lip Seal

Authors: Rui Qiao, Xiujie Gao, L. Catherine Brinson

Published in: Journal of Materials Engineering and Performance | Issue 4-5/2011

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Abstract

The feasibility of using SMA wires to improve the seal effectiveness has been studied experimentally and numerically. In this article, we present only the numerical study of simulating the thermo-mechanical behavior for an SMA enhanced lip seal, leaving the test setup and results in the experimental counterpart. A pseudo 3D SMA model, considering 1D SMA behavior in the major loading direction and elastic response in other directions, was used to capture the thermo-mechanical behavior of SMA wires. The model was then implemented into ABAQUS using the user-defined material subroutine to inherit most features of the commercial finite element package. Two-way shape memory effect was also considered since the SMA material exhibits strong two-way effects. An axisymmetric finite element model was constructed to simulate a seal mounting on a shaft and the sealing pressure was calculated for both the regular seal and the SMA enhanced seal. Finally, the result was qualitatively compared with the experimental observation.

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Note that the thermal expansion coefficient α, instead of Θ is used to calculate the thermal stress in remainder of this article.

Note that in single crystals the austenite phase is isotropic and the martensite phase is not. In polycrystals, the austenite phase may be textured or random and the martensite phase is even more complex. Since the focus is on the phase transformation which is nearly a volume free change process (Ref 13) we assume both phases are isotropic so that the elastic responses can be described using two constants. Furthermore, we assume they have the same and constant Poisson’s ratio that is independent of the martensite fraction in this article. The derivation is remarkably simplified using this approximation and the difference has little impact on the behavior in the loading direction.

It can be seen that the Jacobian matrix is not symmetric. Thus, the unsymmetric option must be used in ABAQUS.

X. Gao, R. Qiao et al., Experimental Setup and Results of an SMA Enhanced Lip Seal, J. Intell. Mater. Syst. Struct., 2011 (to be submitted)

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Title: Model and Simulation of an SMA Enhanced Lip Seal
Authors: Rui Qiao
Xiujie Gao
L. Catherine Brinson
Publication date: 01-07-2011
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 4-5/2011
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-011-9893-4

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