Transactions of Nanjing University of Aeronautics & Astronautics
Thermo-mechanical Behaviors of Functionally Graded Shape Memory Alloy Timoshenko Composite Beams
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Abstract:
This paper focuses on the thermo-mechanical behaviors of functionally graded （FG） shape memory alloy （SMA） composite beams based on Timoshenko beam theory. The volume fraction of SMA fiber is graded in the thickness of beam according to a power-law function and the equivalent parameters are formulated. The governing differential equations， which can be solved by direct integration， are established by employing the composite laminated plate theory. The influences of FG parameter， ambient temperature and SMA fiber laying angle on the thermo-mechanical behaviors are numerically simulated and discussed under different boundary conditions. Results indicate that the neutral plane does not coincide with the middle plane of the composite beam and the distribution of martensite is asymmetric along the thickness. Both the increments of the functionally graded parameter and ambient temperature make the composite beam become stiffer. However， the influence of the SMA fiber laying angle can be negligent. This work can provide the theoretical basis for the design and application of FG SMA structures.
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Clc Number:
O343.5
CHINA AERO-SCIENCES
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