Temperature tuning of band-structure of 1D periodic elastic composites

H. Sadeghi; A. Srivastava; R. Griswold; S. Nemat-Nasser

doi:10.1117/12.914926

28 March 2012 Temperature tuning of band-structure of 1D periodic elastic composites

H. Sadeghi, A. Srivastava, R. Griswold, S. Nemat-Nasser

Proceedings Volume 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012; 834220 (2012) https://doi.org/10.1117/12.914926
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

Abstract

In this paper we show that the bandstructure of a periodic elastic composite, in addition to being dependent upon the micro-constituents and their microarchitecture, may also be controlled by changing the temperature. The essential idea is to fabricate a periodic composite with constituent materials which have temperature dependent elastic properties. As temperature is changed, such a composite is expected to exhibit a bandstructure which changes with the temperature dependent properties of its micro-constituents. For our purpose, we use polyurea and steel to make a 1-D periodic composite. Ultrasonic measurements are done on the sample from 0.5 kHz to 1.5 MHz under changing temperature and the change in the second passband is studied. It is observed that the change in the bandstructure is significant when the temperature is changed from -50°C to 50°C. Experimental results are compared with the theoretical calculations and it is shown that good agreement exists for the observed bandstructure.

Citation Download Citation

H. Sadeghi, A. Srivastava, R. Griswold, and S. Nemat-Nasser "Temperature tuning of band-structure of 1D periodic elastic composites", Proc. SPIE 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012, 834220 (28 March 2012); https://doi.org/10.1117/12.914926

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