| Improvements in the analysis of nonlocal elasticity for nanostructures Raffaele Barretta1; 1UNIVERSITY OF NAPLES FEDERICO II, Naples, Italy; PAPER: 490/Modelling/Keynote (Oral) SCHEDULED: 17:50/Mon. 28 Nov. 2022/Similan 1 ABSTRACT: Nanotechnology has emerged as one of the most promising tools for development of high performance Nano-Electro-Mechanical Systems (NEMS) with a variety of modern engineering applications. Ground breaking NEMS have been rapidly developed and extensively adopted as nano-sensors, nano-actuators, nano-transistors, nano-probes and nano-resonators with a wide domain of conceivable applications. Nanomaterials are designed for the development of modern nano-devices and are efficiently exploited as excellent components for reinforcement in composite nanostructures. Appropriate modelling and exact assessment of size effects in nanomaterials and nanostructures are then themes of current interest in the community of Engineering Science [1]. It is well established that the mechanical behaviour of NEMS significantly deviates from the macroscopic one, due to size effects. However, size dependent behaviours of continua can be conveniently described by Structural Mechanics by resorting to nonlocal constitutive models [2]. The nonlocal approach is still in the main focus of scientific research. The challenge regards consistency of theoretical formulations, validation by experimental results and predictive capability of characteristic phenomena in the nano-scale range [3]. This thematic lecture is aimed to describe available constitutive theories for size dependent problems and to illustrate new proposals which are contributing to an improvement of the state of the art on nonlocal modelling of nanostructures [4, 5]. References: [1] A. Farajpour, M.H. Ghayesh, H. Farokhi, A review on the mechanics of nanostructures. Int. J. Eng. Sci., 133 (2018) 231–263. [2] G. Romano, R. Luciano, R. Barretta, M. Diaco, Nonlocal integral elasticity in nanostructures, mixtures, boundary effects and limit behaviours. Continuum Mech. Thermodyn., 30 (2018) 641–655. [3] Z.P. Bažant, M. Jirásek, Nonlocal integral formulation of plasticity and damage: survey of progress. J. Eng. Mech. ASCE, 128 (2002) 1119–1149. [4] M.S. Vaccaro, F. Marotti de Sciarra, R. Barretta, On the regularity of curvature fields in stress-driven nonlocal elastic beams. Acta Mech., 232 (2021) 2595-–2603. [5] R. Barretta, M. Cˇ anad¯ija, R. Luciano, F. Marotti de Sciarra, On the mechanics of nanobeams on nano-foundations. Int. J. Eng. Sci., 180 (2022) 103747. |
