Evaluation of effective transverse mechanical properties of transversely isotropic viscoelastic composite materials

2011 ◽  
Vol 45 (25) ◽  
pp. 2641-2658 ◽  
Author(s):  
Andrey V. Pyatigorets ◽  
Sofia G. Mogilevskaya
Keyword(s):  
Mechanical Properties ◽  
Effective Properties ◽  
Transversely Isotropic ◽  
Elastic Fibers ◽  
Reinforced Composites ◽  
Viscoelastic Composite ◽  
Viscoelastic Matrix ◽  
Linear Viscoelastic ◽  
Comparison Of The Results ◽  
Benchmark Solutions

A new computational approach for calculation of the effective transverse mechanical properties of unidirectional fiber-reinforced composites with linear viscoelastic matrix and elastic fibers is presented. The approach requires the knowledge of stresses outside a cluster representing the structure of composite in question. The effective properties are found from the assumption that the viscoelastic stresses at the distances far away from the cluster are the same as those from a single equivalent inhomogeneity. The approach directly takes into account the interactions between the inhomogeneities. The comparison of the results with several benchmark solutions reveals the advantages of the developed approach.

Micromechanical Analysis of Nonlinear Viscoelastic Unidirectional Fiber-Reinforced Composites

2011 ◽  
Vol 110-116 ◽  
pp. 1166-1170 ◽  
Author(s):  
Hasan Behzadpoor ◽  
Saeed Masoumi ◽  
Manouchehr Salehi
Keyword(s):  
Three Dimensional ◽  
Fiber Reinforced Composites ◽  
Elastic Fibers ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Creep Tests ◽  
Unidirectional Fiber ◽  
Viscoelastic Matrix ◽  
Nonlinear Viscoelastic ◽  
Micromechanical Approach

The micromechanical approach of Simplified Unit Cell Method (SUCM) in closed-form three dimensional solutions is used for predicting creep response of unidirectional fiber reinforced composites. The composite consist of elastic fibers reinforcing nonlinear viscoelastic resin. The nonlinear viscoelastic matrix behavior is modeled by using Schapery single integral viscoelastic constitutive equation. Off-axis specimens of graphite/epoxy with 45 and 90 fiber orientations were subjected to 480 minutes creep tests and the results is compared with experimental data and MOC results available in the literature. There is good agreement with experimental results due to using SUCM.

A Multicontinuum Approach to Structural Analysis of Linear Viscoelastic Composite Materials

1997 ◽  
Vol 64 (4) ◽  
pp. 795-803 ◽  
Author(s):  
M. R. Garnich ◽  
A. C. Hansen
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Viscoelastic Composite ◽  
Linear Elastic ◽  
Viscoelastic Matrix ◽  
Constituent Material ◽  
Linear Viscoelastic ◽  
Reinforcing Material ◽  
Structural Solutions ◽  
Continuum Field

A “multicontinuum” approach to structural analyses of composites is described. A continuum field is defined to represent each constituent material along with the traditional continuum field associated with the composite. Finite element micromechanics is used to establish relationships between composite and constituent field variables. These relationships uncouple the micromechanics from structural solutions and render an efficient means of extracting constituent information during the course of a finite element structural analysis. Equations are developed for the case of a linear elastic reinforcing material embedded in a linear viscoelastic matrix and verified by comparison with results of finite element micromechanics.

scholarly journals Micromechanical modelling of porous viscoelastic composite materials

2018 ◽  
Vol 191 ◽  
pp. 00007
Author(s):  
Mohamed El Kouri ◽  
Abderrahmane Bakkali ◽  
Lahcen Azrar
Keyword(s):  
Effective Properties ◽  
Methodological Approach ◽  
Micromechanical Model ◽  
Mean Field ◽  
Viscoelastic Composite ◽  
Field Techniques ◽  
Viscoelastic Matrix ◽  
Convolution Products ◽  
Viscoelastic Composites ◽  
Effective Behavior

Modelling and predicting the effective behavior of non-ageing viscoelastic composites have attracted the attention of many researchers. Actually, predicting the effective behavior and the macroscopic overall response while taking into account the constituents properties and shape of inclusions as well as their volume fractions is a challenging topic. In this work, porous viscoelastic composites are considered. The porous effect is introduced as a solid voided inclusions embedded in a viscoelastic matrix. The effective behavior is modelled by delayed integropartial differential equations. The resolution of the resulting equations is done through a methodological approach based on the Volterra tensorial products and the dynamic Green‘s tensor. Thus, the localization equations relating the local and the global fields are derived. After that, the Mori-Tanaka mean field micromechanical model assumptions are applied to derive the Mori-Tanaka‘s localization tensor. Once this step is completed, the effective properties are obtained through mean field techniques. The effective properties are given through tensorial convolution products. A numerical algorithm is elaborated for the computation of direct and inverse tensorial convolution products. For the validation of the developed modelling a comparison with Laplace-Carson approach is done.

scholarly journals Particle Simulation for Predicting Effective Properties of Short Fiber Reinforced Composites

2016 ◽  
Vol 08 (02) ◽  
pp. 1650016 ◽  
Author(s):  
Kirill A. Skoptsov ◽  
Sergey V. Sheshenin ◽  
Vladimir V. Galatenko ◽  
Artem P. Malakho ◽  
Olga N. Shornikova ◽  
...  
Keyword(s):  
Composite Material ◽  
Effective Properties ◽  
Short Fiber ◽  
Particle Simulation ◽  
Elastic Fibers ◽  
Reinforced Composites ◽  
Molding Process ◽  
Mesh Free ◽  
Mesh Free Method ◽  
Product Quality Improvement

We present a method for evaluating elastic properties of a composite material produced by molding a resin filled with short elastic fibers. A flow of the filled resin is simulated numerically using a mesh-free method. After that, assuming that spatial distribution and orientation of fibers are not significantly changed during polymerization, effective elastic moduli of the composite material are evaluated. The developed micro-mechanical mathematical modelling of effective moduli is aimed to molding process optimization which results in product quality improvement.

Effect of Epoxy Resin Concentration on Some Mechanical Properties of Carbon Fabric/ Nitrile Rubber Reinforced Composites

2019 ◽  
Vol 9 (1) ◽  
pp. 1-15
Author(s):  
Sawsan Fakhry Halim ◽  
Said Sayed Gad El Kholy ◽  
HalaFikry Naguib ◽  
Riham Samir Hegazy ◽  
Nermen Mohamed Baheg
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Nitrile Rubber ◽  
Reinforced Composites ◽  
Carbon Fabric

scholarly journals Effective Complex Properties for Three-Phase Elastic Fiber-Reinforced Composites with Different Unit Cells

Technologies ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 12
Author(s):  
Federico J. Sabina ◽  
Yoanh Espinosa-Almeyda ◽  
Raúl Guinovart-Díaz ◽  
Reinaldo Rodríguez-Ramos ◽  
Héctor Camacho-Montes
Keyword(s):  
Effective Properties ◽  
Elastic Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Effective Coefficients ◽  
Three Phase ◽  
Out Of Plane ◽  
Local Problems ◽  
Unit Cells

The development of micromechanical models to predict the effective properties of multiphase composites is important for the design and optimization of new materials, as well as to improve our understanding about the structure–properties relationship. In this work, the two-scale asymptotic homogenization method (AHM) is implemented to calculate the out-of-plane effective complex-value properties of periodic three-phase elastic fiber-reinforced composites (FRCs) with parallelogram unit cells. Matrix and inclusions materials have complex-valued properties. Closed analytical expressions for the local problems and the out-of-plane shear effective coefficients are given. The solution of the homogenized local problems is found using potential theory. Numerical results are reported and comparisons with data reported in the literature are shown. Good agreements are obtained. In addition, the effects of fiber volume fractions and spatial fiber distribution on the complex effective elastic properties are analyzed. An analysis of the shear effective properties enhancement is also studied for three-phase FRCs.

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