Showing papers in "Mechanics Research Communications in 2022"

TL;DR: In this article , the Piola transformations of the contact surface and line forces as well as double-forces are derived for external virtual work functionals compatible with second-gradient internal work functions.

TL;DR: In this article , the authors employ a methodology based on asymptotic homogenization in order to obtain metamaterials parameters and then present the influence of these additional parameters by using simulations.

TL;DR: In this paper , a simple approach to rectify unconstrained neural networks for hyperelastic constitutive models is proposed with the aim of ensuring both mathematical well-posedness (in terms of existence theorems) and physical consistency.

TL;DR: In this paper , strong ellipticity conditions for strain gradient and micromorphic continua considering them as an enhancement of a simple nonlinearly elastic material called in the following primary material are discussed.

TL;DR: In this article , a simplified version of the manifold asymptotic analyses available in the literature is discussed and a simplified Boussinesq approximated governing equation for buoyant flows is presented.

TL;DR: In this article , Positron emission particle tracking (PEPT) was employed to benchmark tuned Discrete Element Method (DEM) simulations, and the results suggest a strong statistical agreement between the tuned DEM and coarse-grained PEPT data.

TL;DR: In this article , a deformation energy for describing the mechanical behavior of so-called pantographic blocks is proposed, that is bodies constituted by stacking of N layers of pantographic sheets.

TL;DR: In this paper , three sophisticated methods are introduced to compute tangent stiffness matrices in Finite Element Analysis by Artificial Neural Networks (ANNs) and a modified training procedure is proposed by adding a loss term corresponding to the element stiffness matrix in the optimization criteria.

TL;DR: In this article , a novel relative rotation tensor is used as a measure of deformation in addition to the classical strain tensor and the wryness tensor, and an orthogonal microrotation matrix is considered with four degrees of freedom which admits four opportune constraints.

TL;DR: In this article , an orthotropic 2D chiral Cosserat continuum model is introduced to account for the coupling between stretching deformations and micro-rotation for hemitropic materials.

TL;DR: In this paper , a micromechanical theoretical model for liquid crystal elastomers (LCE) is proposed and several examples of morphing of architected LCE elements, whose mechanical response is obtained through finite element (FE) numerical analyses based on the proposed model, are illustrated and critically discussed.

TL;DR: In this paper , the strong ellipticity condition within the Toupin-Mindlin first strain gradient elasticity theory is discussed, which is closely related to certain material instabilities and describes mathematical properties of corresponding boundary value problems.

TL;DR: In this article , the authors employ the theory of peridynamics to study brittle fracture in ultra-high performance concrete and describe the capabilities of the peridynamic model for the numerical simulation of a dynamic Brazilian test.

TL;DR: In this paper , a model of the surface as a wide annular developable strip is found to capture the qualitative observations in experiments and simulations, which are consequential to the design of crumpled elastic sheets, developable surfaces, origami and kirigami, and other deployable and compliant structures.

TL;DR: In this article , a micromechanics method, dubbed unified unit-cell model, was proposed to predict the effective elastic constants of 0-3, 1-3 and 2-2 composites.

TL;DR: In this article , the authors numerically study adhesive contact between an elastic half-space and a rigid punch with elliptic shape and superimposed roughness using the Fast Fourier Transform-assisted Boundary Element Method for JKR-type adhesive contact.

TL;DR: In this article , the constitutive relation and the strain energy function for an initially stressed material that completely follows the characteristics of the Gent model in the virtual stress-free reference were exactly determined.

TL;DR: In this article , the authors compare and contrast the geometry and structural behavior of a Yoshimura origami structure made from thin and thick panels, and demonstrate the suitability of the thick panel structure over the thin panel version for resisting applied loads at configurations close to the fully-deployed state.

TL;DR: Inconel 617 superalloy is a main candidate to be used for mechanical and tribo-components in high temperature helium-cooled reactors as mentioned in this paper , and the effect of temperature on contact friction constituent contributors, adhesion and plowing at small scales.

TL;DR: In this article , the authors studied various erosion and entrainment behaviors in snow avalanches using the material point method (MPM), finite strain elastoplasticity and critical state soil mechanics.

TL;DR: In this article , a homogenization method of fibrous bio-inspired materials with a pre-defined structure was proposed to estimate their effective elastic properties, and the elastic moduli in the direction of stretching and a mutually orthogonal direction were estimated for both discrete and continuum models.

TL;DR: In this article , the authors employ the Chebyshev tau-qz algorithm to investigate the stability of the double-diffusive convection in a vertical annulus, in which the inner cylinder maintains cold and fresh and the outer cylinder warm and salty.

TL;DR: In this paper , the authors derived analytical solutions to peridynamic Kirchhoff type (shear rigid) plates equations for both static and dynamic cases by applying trigonometric series with respect to in-plane coordinates.

TL;DR: In this paper , a particle model devoted to the study of three-dimensional grain packages in a dynamic setting is presented and discussed, which considers each grain as a rigid sphere immersed in an elastically deformable medium.

TL;DR: In this paper , an energy-based methodology to compute internal stress states compatible with foundation settlements in masonry structures is presented, where the objective function minimizes the complementary energy, which directly considers prescribed foundation displacements.

TL;DR: In this paper , a combined weakly-nonlinear and numerical investigation of the effect of inclination on the manner of onset of convective instability in an inclined porous layer heated from below is presented.

TL;DR: A finite element procedure for the simulation of biologically inspired adhesives with a mushroom-shaped patterned surface by formulating a novel interface finite element was proposed in this article , which can capture the attachment and detachment mechanisms without modeling the microstructures on the surface in detail, which is the major issue of large-scale simulations involving complex surfaces.

TL;DR: Comparisons with Voronoi-cell lattice models provide discrete representations of material structure through comparisons with the VEM for simulating the deformation of multiphase composites demonstrate the accuracy and accuracy of the virtual element method.

TL;DR: In this paper , a cable truss structure is designed to support concentrated vertical loads within a given span, considering both loading and unloading states, and a constrained nonlinear optimization method in terms of structure parameters is proposed.