Axial and Torsional Free Vibrations of Elastic Nano-Beams by Stress-Driven Two-Phase Elasticity

Apuzzo, Andrea; Barretta, Raffaele; Fabbrocino, Francesco; Faghidian, S. Ali; Luciano, Raimondo; Marotti de Sciarra, Francesco

doi:10.22055/jacm.2018.26552.1338

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	Axial and Torsional Free Vibrations of Elastic Nano-Beams by Stress-Driven Two-Phase Elasticity
Article 19, Volume 5, Issue 2, Spring 2019, Page 402-413 PDF (1788 K)
Document Type: Research Paper
DOI: 10.22055/jacm.2018.26552.1338
Authors
Andrea Apuzzo¹; Raffaele Barretta ²; Francesco Fabbrocino³; S. Ali Faghidian ⁴; Raimondo Luciano¹; Francesco Marotti de Sciarra²
¹Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via G. Di Biasio 43, 03043 Cassino (FR), Italy
²Department of Structures for Engineering and Architecture, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy
³Department of Engineering, Telematic University Pegaso, Piazza Trieste e Trento 48, 80132, Naples, Italy
⁴Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Abstract
Size-dependent longitudinal and torsional vibrations of nano-beams are examined by two-phase mixture integral elasticity. A new and efficient elastodynamic model is conceived by convexly combining the local phase with strain- and stress-driven purely nonlocal phases. The proposed stress-driven nonlocal integral mixture leads to well-posed structural problems for any value of the scale parameter. Effectiveness of stress-driven mixture is illustrated by analyzing axial and torsional free vibrations of cantilever and doubly clamped nano-beams. The local/nonlocal integral mixture is conveniently replaced with an equivalent differential law equipped with higher-order constitutive boundary conditions. Exact solutions of fundamental natural frequencies associated with strain- and stress-driven mixtures are evaluated and compared with counterpart results obtained by strain gradient elasticity theory. The provided new numerical benchmarks can be effectively employed for modelling and design of Nano-Electro-Mechanical-Systems (NEMS).
Keywords
Free vibrations; Nonlocal integral elasticity; Mixtures; Size effects; Hellinger-Reissner variational principle; Analytical modelling
Main Subjects
Applied Mathematics


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