Dynamic Characterization of Microstructured Materials Made of Hexagonal-Shape Particles with Elastic Interfaces

Abstract

This work aims to present the dynamic character of microstructured materials made of hexagonal-shape particles interacting with elastic interfaces. Several hexagonal shapes are analyzed to underline the different constitutive behavior of each texture. The mechanical behavior at the macro scale is analyzed by considering a discrete model assumed as a benchmark of the problem and it is compared to a homogenized micropolar model as well as a classical one. The advantages of the micropolar description with respect to the classical one are highlighted when internal lengths and anisotropies of microstuctured materials are taken into consideration. Comparisons are presented in terms of natural frequencies and modes of vibrations.

Mechanical characterization of composite materials with rectangular microstructure and voids

“…, not yet previously detailed for these kinds of materials, and how the introduction of a new internal characteristic of the material, the size of the voids, involves a deterioration of the results compared to nonporous materials for the classical model [65]. As widely shown in earlier works [59,62,81], for orthotropic media the inadequacy of the a classical continuum arises even when the actual value of the length parameter of the internal microstructure can be considered small compared to the macroscopic characteristics.…”

“…There are also many examples in which materials with voids [38][39][40] have been studied referring to Cosserat theory, such as foams [41][42][43][44], granular and geo-materials [45][46][47][48][49][50][51], cellular solids [52][53][54] and different kind of structures such as rods [55] and shells [56][57][58] or even multifield models with affine microstructure [5,7]. In order to extend the numerical investigations about the microstructured composite materials made of rigid particles and elastic thin interfaces [59][60][61], the goal is to test the efficiency of the homogenization technique adopted [62,63], to describe porous materials, not yet analyzed with this approach by the authors themselves [64][65][66]. The study is conducted both in static and dynamic conditions, varying the internal characteristics and then proposing a comparison between a discrete model and two continuous models, one micropolar and one classic.…”

Time-History Analysis of Composite Materials with Rectangular Microstructure under Shear Actions

“…The results reported below investigate the behavior of a wall, clamped at the base and subjected to a distributed dynamic shear load applied at the top (Figure 3), in order to extend the numerical results already obtained for the static case [48] and to enrich the aspects related to the dynamic conditions [47]. Furthermore, a numerical evaluation, for the case in which blocks of different sizes are present in the masonry texture, wants to be performed, because in previous works, this aspect has been evaluated only in qualitative terms [25].…”

“…In this work, two types of rectangular block textures at three different level scales are considered: the goal is to emphasize the advantages and the necessity of a description of these materials as micropolar continua compared to the classical continua even for dynamic conditions [47] not yet fully examined by the authors. For this purpose, a timehistory analysis is used to determine the response of a structure under dynamic load.…”

Special Issue of Nanomaterials: Mechanics of Nanostructures and Nanomaterials

“…In the presented Special Issue, six research papers [ 1 , 2 , 3 , 4 , 5 , 6 ] are published. Topics of published papers cover analyses of different engineering problems of nanostructures.…”