Tunable metamaterial beam with shape memory alloy resonators: Theory and experiment

Autor(es)

de Sousa, Vagner Candido ^[1] ; Tan, David ^[2] ; De Marqui Jr, Carlos ; Erturk, Alper ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Aeronaut Engn, BR-13566590 Sao Carlos, SP - Brazil

^[2] Georgia Inst Technol, GW Woodruff Sch Mech Engn, Atlanta, GA 30332 - USA

• Tipo de documento: Artigo Científico
• Fonte: Applied Physics Letters; v. 113, n. 14 OCT 1 2018.
• Citações Web of Science: 7

Resumo

We investigate and experimentally validate the concept of bandgap tuning in a locally resonant metamaterial beam exploiting shape memory alloy (SMA) resonators. The underlying mechanism is based on the difference between the martensitic phase (low temperature) and austenitic phase (high temperature) elastic moduli of the resonators, enabling a significant shift of the bandgap for a sufficient temperature change. Experimental validations are presented for a base-excited locally resonant metamaterial beam with SMA resonators following a brief theoretical background. It is shown that the lower bound of the bandgap as well as the bandwidth can be increased by 15% as the temperature is increased from 25 degrees C to 45 degrees C for the specific SMAs used in this work for concept demonstration. The change in the bandgap lower bound frequency and its bandwidth is governed by the square root of the fully austenitic to fully martensitic elastic moduli ratio, and it could be as high as 70% or more for other SMAs reported in the literature. Published by AIP Publishing. (AU)

• Processo FAPESP: 17/08467-6 - Efeitos de elementos com memória de forma sobre o comportamento de sistemas aeorelásticos e metamateriais adaptativos
• Beneficiário: Vagner Candido de Sousa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 15/26045-6 - Efeitos de elementos com memória de forma sobre o comportamento de sistemas aeroelásticos e metamateriais adaptativos.
• Beneficiário: Vagner Candido de Sousa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado