 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 12854 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8044
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| In English (Mech. Solids): | | 4810 |
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| Liang Sun, Jianjun Li, and Yougang Xiao, "Broad and low frequency bandgap in truss core sandwich beam," Mech. Solids. 56 (3), 421-429 (2021) |
| Year |
2021 |
Volume |
56 |
Number |
3 |
Pages |
421-429 |
| DOI |
10.3103/S0025654421030122 |
| Title |
Broad and low frequency bandgap in truss core sandwich beam |
| Author(s) |
Liang Sun (College of Traffic and Transportation Engineering, Central South University, Changsha, 410075 China; Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha, 410075 China)
Jianjun Li (College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083 Hunan, China)
Yougang Xiao (College of Traffic and Transportation Engineering, Central South University, Changsha, 410075 China; Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha, 410075 China, csuxyg@csu.edu.cn) |
| Abstract |
The concept of phononic crystals is employed to improve vibroacoustic properties of truss core sandwich beams. A typical sandwich beam exhibits a flexural wave bandgap, as well as significant vibration attenuation, from 968 to 2132 Hz without adding any structure. Therefore it has big advantages of easy manufacturing and lightweight over sandwich beams with local resonators, which include complex structures and additional weight. In addition, through developing simplified model, the analytic expressions are obtained to determine bandgap edges. The results show bandgap structure can be engineered by adjusting the geometrical dimensions of the unit cell. The fundamental origin of the bandgap is Bragg scattering of the local flexural wave, which results from metastructure of the sandwich beam. Benefiting from the low stiffness face sheets and mechanism of Bragg scattering, the structure owns a bandgap with low frequency and broad width at the same time. Hence the truss core sandwich structure has great potential in engineering practice to reduce the sound and vibration transmission. |
| Keywords |
Truss core sandwich beams, Phononic crystals, Bandgap, Bragg scattering, Flexural wave |
| Received |
01 December 2020 | Revised |
01 January 2021 | Accepted |
04 January 2021 |
| Link to Fulltext |
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