التفاصيل البيبلوغرافية
| العنوان: |
Elastic Wave Propagation in Open-Cell Foams. |
| المؤلفون: |
Bayat, Alireza1 abayat1@jhu.edu, Gaitanaros, Stavros2 stavrosg@jhu.edu |
| المصدر: |
Journal of Applied Mechanics. May2019, Vol. 86 Issue 5, p1-11. 11p. |
| مصطلحات موضوعية: |
*FOAM, *ELASTIC wave propagation, *BLOCH waves, *FINITE element method, *GROUP velocity, *PHASE velocity, *THEORY of wave motion |
| مستخلص: |
This work examines elastic wave propagation phenomena in open-cell foams with the use of the Bloch wave method and finite element analysis. Random foam topologies are generated with the Surface Evolver and subsequently meshed with Timoshenko beam elements, creating open-cell foam models. Convergence studies on band diagrams of different domain sizes indicate that a representative volume element (RVE) consists of at least 8³ cells. Wave directionality and energy flow features are investigated by extracting phase and group velocity plots. Explicit dynamic simulations are performed on finite size domains of the considered foam structure to validate the RVE results. The effect of topological disorder is studied in detail, and excellent agreement is found between the wave behavior of the random foam and that of both the regular and perturbed Kelvin foams in the low-frequency regime. In higher modes and frequencies, however, as the wavelengths become smaller, disorder has a significant effect and the deviation between regular and random foam increases significantly. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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