Autori: Raffaele Barretta, Andrea Caporale, S. Ali Faghidian, Raimondo Luciano, Francesco Marotti de Sciarra, Carlo Maria Medaglia
Editore: Elsevier
Tipologia Prodotto: Contributo in rivista – Articolo scientifico (Article)
DOI: https://doi.org/10.1016/j.compositesb.2019.01.012
Titolo della Rivista: Composites Part B: Engineering
Numero; Volume: 164
Numero prima e ultima pagina: 590 – 598
Codice ISSN: 1359-8368
Anno di Pubblicazione: 2019
Link: https://www.sciencedirect.com/science/article/abs/pii/S1359836818321930
Abstract:
A well-posed stress-driven mixture is proposed for Timoshenko nano-beams. The model is a convex combination of local and nonlocal phases and circumvents some problems of ill-posedness emerged in strain-driven Eringen-like formulations for structures of nanotechnological interest. The nonlocal part of the mixture is the integral convolution between stress field and a bi-exponential averaging kernel function characterized by a scale parameter. The stress-driven mixture is equivalent to a differential problem equipped with constitutive boundary conditions involving bending and shear fields. Closed-form solutions of Timoshenko nano-beams for selected boundary and loading conditions are established by an effective analytical strategy. The numerical results exhibit a stiffening behavior in terms of scale parameter.
Keywords: Integral elasticity; Local/Nonlocal stress-driven mixture; Stubby nano-beams; Nanomaterials; NEMS