Showing papers in "International Journal of Engineering Science in 2017"

TL;DR: In this article, the bending field is placed in the proper position of input variable, giving to the elastic curvature field the role of output of the constitutive law, evaluated by convolution between the bending fields and an averaging kernel.

TL;DR: In this paper, the free vibration of nanobeams based on the non-local strain gradient theory was investigated and the results were compared with other beam models and other classical and non-classical theories.

TL;DR: In this paper, the bending of nano/micro beams under the concentrated and distributed loads has been investigated by using Euler Bernoulli beam theory via the enhanced Eringen differential model.

TL;DR: In this article, a size-dependent integral elasticity model is developed for a small-scaled rod in tension based on the nonlocal strain gradient theory, which contains a nonlocal parameter and a material length scale parameter to incorporate the scaling effects of nonlocal stress and microstructure-dependent strain gradient.

TL;DR: In this paper, the in-plane free vibrations (axial and bending) of a Bernoulli-Euler nanobeam using the mixed local/non-local Eringen elasticity theory is studied.

TL;DR: In this paper, a unified size-dependent high-order beam model which contains various higher-order shear deformation beam models as well as Euler-Bernoulli and Timoshenko beam models is developed to study the simultaneous effects of nonlocal stress and strain gradient on the bending and buckling behaviors of nanobeams by using the nonlocal strain gradient theory.

TL;DR: In this paper, a general nonlocal strain-gradient (NSG) elasticity model is developed for vibration analysis of porous nano-scale plates on an elastic substrate, incorporating two scale coefficients to examine the vibration characteristics much accurately.

TL;DR: In this paper, the size-dependent oscillations of a third-order shear-deformable functionally graded microbeam are investigated taking into account all the longitudinal and transverse displacements and inertia as well as the rotation and rotary inertia.

TL;DR: In this paper, the peridynamic model is enriched with bond rotation effect and reformulated in the thermodynamic framework with emphasis on mathematical derivation of the micro elastic moduli.

TL;DR: In this paper, the buckling problem of Euler-Bernoulli beams has been investigated using Eringen's nonlocal integral model and a reduction method rigorously proved in the previous work is used to reduce the resulting integro-differential equation to a fourth order differential equation with mixed boundary conditions.

TL;DR: In this article, the authors formulated the longitudinal dynamic problem of a size-dependent elasticity rod by utilizing an integral form of nonlocal strain gradient theory and derived the governing equations and boundary conditions for the longitudinal dynamics of the rod by employing the Hamilton principle.

TL;DR: In this paper, the size-dependent thermal buckling and post-buckling behavior of nanotubes made of functionally graded materials (FGMs) with porosities is investigated by using a refined beam theory.

TL;DR: In this paper, a nonlocal-couple stress-surface elasticity (NLCSSE) model is proposed to account for the simultaneous effects of the microstructure local rotation and the surface energy in the framework of the nonlocal elasticity.

TL;DR: In this paper, the nonlinear motion characteristics of a bilayered Timoshenko microbeam are analyzed taking into account all the translational (i.e., longitudinal and transverse) and rotational motions; the effect of size is included through use of the modified couple stress theory.

TL;DR: In this article, a general bi-Helmholtz nonlocal strain-gradient elasticity model is developed for wave dispersion analysis of porous double-nanobeam systems in thermal environments.

TL;DR: In this paper, an analytical framework is developed for predicting the effective in-plane elastic moduli (longitudinal and transverse Young's modulus, Poisson's ratios and shear modulus) of irregular hexagonal lattices with generalized form of spatially random structural geometry.

TL;DR: In this article, the size effects on the dynamic behaviors of rods are investigated within the framework of the nonlocal strain gradient elastic theory, and the variationally consistent boundary conditions are derived by using the weighted residual method with respect to the known equation of motion of rods.

TL;DR: In this paper, the authors investigated the mechanical behavior of a unimorph piezoelectric cantilever beam with a tip magnet and nonlinear boundary conditions imposed by repelling permanent two external magnets, subjected to a harmonic base excitation.

TL;DR: In this article, a theoretical model incorporating flexoelectricity and piezoelectrics for energy harvesting is developed, which includes geometric nonlinearity deformation and damping effect so that it can more accurately predict the electromechanical behavior of energy harvesters.

TL;DR: In this paper, the size-dependent primary resonant characteristics of a simply supported micropipe conveying fluid in subcritical domain are examined via depicting frequency-response and force-response curves.

TL;DR: In this paper, the authors investigated the size-dependent and independent stability behavior of a geometrically perfect and imperfect extensible micropipe conveying fluid under different boundary conditions.

TL;DR: In this paper, the dynamic behavior of double layered nanoplate systems (DLNPS) with respect to a moving nanoparticle is investigated, where both layers of DLNPS are assumed to be orthotropic and each layer is bearing a biaxial load while internal damping effects are also taken into account.

TL;DR: In this paper, a thermomechanically coupled constitutive model for polycrystalline shape memory alloys (SMAs) undergoing finite deformation is presented, where three important characteristics of SMA behavior are considered in the development of the model, namely the effect of coexistence between austenite and two martensite variants, the variation of hysteresis size with temperature and the smooth material response at initiation and completion of phase transformation.

TL;DR: In this paper, the authors investigated the nonlinear size-dependent dynamics of a functionally graded micro-cantilever subject to a base excitation resulting in large-amplitude oscillations.

TL;DR: In this paper, the forced nonlinear size-dependent vibrations and bending of axially functionally graded (AFG) tapered microbeams are examined incorporating extensibility, employing the modified version of the couple stress-based theory, the nonlinear partial differential equations for the transverse and longitudinal motions for a clamped-clamped AFG tapeed microbeam are obtained via Hamilton's principle.

TL;DR: In this paper, a consistent nonlinear model for the doubly curved shallow microshell is developed on the basis of the modified couple stress theory (MCST) in an orthogonal curvilinear coordinate system.

TL;DR: In this paper, a comprehensive study on the mechanical behavior of non-uniform small-scale beams in the framework of nonlocal strain gradient theory is presented, where the governing equations and boundary conditions have been developed using Hamilton's principle and solved with the aid of finite element method for introducing bending, buckling and free vibration response of nano-beams.

TL;DR: In this article, the effects of cell size and cell wall thickness variations on the compressive and shear strengths of closed-cell foams were investigated using Laguerre tessellation models.

TL;DR: In this article, an axisymmetric contact problem on indentation of a rigid conical punch into an elastic transversely isotropic half-space with a functionally graded transversely-isotropic coating is considered.

TL;DR: In this paper, a broadband piezoelectric energy harvester with an applied restoring force is studied, where the restoring force was modeled as a spring in the boundary conditions of the system, and the system was composed of a clamped-free beam with a tip mass supported by a spring at the free end.