Thermo-mechanical analysis of periodic multiphase materials by a multiscale asymptotic homogenization approach

2006 ◽  
Vol 69 (1) ◽  
pp. 87-113 ◽  
Author(s):  
H. W. Zhang ◽  
S. Zhang ◽  
J. Y. Bi ◽  
B. A. Schrefler
Keyword(s):  
Mechanical Analysis ◽  
Asymptotic Homogenization ◽  
Multiphase Materials ◽  
Homogenization Approach

scholarly journals A hierarchical asymptotic homogenization approach for viscoelastic composites

2020 ◽  
pp. 1-12 ◽  
Author(s):  
Oscar Luis Cruz-González ◽  
Ariel Ramírez-Torres ◽  
Reinaldo Rodríguez-Ramos ◽  
Raimondo Penta ◽  
Julián Bravo-Castillero ◽  
...  
Keyword(s):  
Asymptotic Homogenization ◽  
Homogenization Approach ◽  
Viscoelastic Composites

scholarly journals Effective properties of hierarchical fiber-reinforced composites via a three-scale asymptotic homogenization approach

2019 ◽  
Vol 24 (11) ◽  
pp. 3554-3574 ◽  
Author(s):  
Ariel Ramírez-Torres ◽  
Raimondo Penta ◽  
Reinaldo Rodríguez-Ramos ◽  
Alfio Grillo
Keyword(s):  
Composite Structures ◽  
Effective Properties ◽  
Elastic Solid ◽  
Asymptotic Homogenization ◽  
Linear Elastic ◽  
Homogenization Technique ◽  
Effective Coefficients ◽  
Out Of Plane ◽  
Mineralized Tissues ◽  
Homogenization Approach

The study of the properties of multiscale composites is of great interest in engineering and biology. Particularly, hierarchical composite structures can be found in nature and in engineering. During the past decades, the multiscale asymptotic homogenization technique has shown its potential in the description of such composites by taking advantage of their characteristics at the smaller scales, ciphered in the so-called effective coefficients. Here, we extend previous works by studying the in-plane and out-of-plane effective properties of hierarchical linear elastic solid composites via a three-scale asymptotic homogenization technique. In particular, the approach is adjusted for a multiscale composite with a square-symmetric arrangement of uniaxially aligned cylindrical fibers, and the formulae for computing its effective properties are provided. Finally, we show the potential of the proposed asymptotic homogenization procedure by modeling the effective properties of musculoskeletal mineralized tissues, and we compare the results with theoretical and experimental data for bone and tendon tissues.

scholarly journals An asymptotic homogenization approach to the microstructural evolution of heterogeneous media

2018 ◽  
Vol 106 ◽  
pp. 245-257 ◽  
Author(s):  
Ariel Ramírez-Torres ◽  
Salvatore Di Stefano ◽  
Alfio Grillo ◽  
Reinaldo Rodríguez-Ramos ◽  
José Merodio ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Heterogeneous Media ◽  
Asymptotic Homogenization ◽  
Homogenization Approach

Transmission electron microscopy of composite materials

1988 ◽  
Vol 46 ◽  
pp. 1012-1015
Author(s):  
K.P.D. Lagerlof
Keyword(s):  
Composite Materials ◽  
Physical Properties ◽  
Structural Defects ◽  
Structural Composites ◽  
Multiphase Materials ◽  
Structural Reinforcement ◽  
Transmission Electron ◽  
Reinforced Fiber ◽  
Particulate Reinforced Composites ◽  
Definition Of

Although most materials contain more than one phase, and thus are multiphase materials, the definition of composite materials is commonly used to describe those materials containing more than one phase deliberately added to obtain certain desired physical properties. Composite materials are often classified according to their application, i.e. structural composites and electronic composites, but may also be classified according to the type of compounds making up the composite, i.e. metal/ceramic, ceramic/ceramie and metal/semiconductor composites. For structural composites it is also common to refer to the type of structural reinforcement; whisker-reinforced, fiber-reinforced, or particulate reinforced composites [1-4].For all types of composite materials, it is of fundamental importance to understand the relationship between the microstructure and the observed physical properties, and it is therefore vital to properly characterize the microstructure. The interfaces separating the different phases comprising the composite are of particular interest to understand. In structural composites the interface is often the weakest part, where fracture will nucleate, and in electronic composites structural defects at or near the interface will affect the critical electronic properties.

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

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