scholarly journals Prediction of effective elastic characteristics of a multiphase composite material with a spatially reinforced system of fibers

2020 ◽  
Author(s):  
E. M. Romanovskaia ◽  
E. A. Mityushov ◽  
S. A. Berestova
Keyword(s):  
Composite Material ◽  
Multiphase Composite ◽  
Elastic Characteristics

scholarly journals ЧИСЕЛЬНЕ ВИЗНАЧЕННЯ ЕФЕКТИВНИХ ПРУЖНИХ ХАРАКТЕРИСТИК ТРИВИМІРНОАРМОВАНОГО ВОЛОКНИСТОГО КОМПОЗИЦІЙНОГО МАТЕРІАЛУ

2020 ◽  
pp. 121-129
Author(s):  
Андрій Володимирович Морозов
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Periodic Structure ◽  
Representative Volume Element ◽  
Numerical Experiments ◽  
Three Dimensional ◽  
Volume Element ◽  
Representative Volume ◽  
Mechanics Of Composite Materials ◽  
Elastic Characteristics

The processes occurring in composite materials are determined by differential equations in partial derivatives with variable coefficients. Most composite materials have a periodic structure, so the coefficients in the equations are rapidly oscillatory periodic functions. The most effective method for studying the stress and deformation field in structures made of composite materials is the method of finite elements, where a nonhomogeneous composite material is replaced by an equivalent homogeneous anisotropic material. To determine averaged characteristics of a composite material with a periodic structure requires a verified methodology allowing to do this. Therefore, the fundamental goal of the mechanics of composite materials is to calculate the effective elastic characteristics of the material. The paper considers the urgent issue of determining effective elastic characteristics of three-dimensional reinforced composite materials based on known elastic properties of fibers and matrix and distribution of reinforcing fibers by volume of composite material.The paper presents the mathematical modeling of the minimum three-dimensional representative volume element based on the specified reinforcement scheme and geometrical dimensions of components. Numerical experiments are performed with the ANSYS software package. A series of numerical experiments simulate six deformation cases: uniaxial tension in the X, Y, Z directions, and shear in the XY, YZ, and XZ planes. Numerical studies of the stress and strain state of the representative volume element of composite material determine the effective elastic constants of equivalent homogeneous material. Two series of calculations are performed with specifying appropriate symmetry and periodicity conditions.The results of the experimental study allow for the verification of the proposed methodology for determining the effective elastic characteristics of three-dimensional reinforced fiber composite materials. The developed numerical methodology enables us to solve the issues of the mechanics of composite materials with the help of modern software packages in the mathematical framework of which the finite element method is used.

Estimation of stressed-deformed state of polymer composite material with hybrid matrix

2021 ◽  
Vol 0 (9) ◽  
pp. 2-7
Author(s):  
E. A. Kosenko ◽  
◽  
V. A. Nelyub ◽  
Keyword(s):  
Composite Material ◽  
Polymer Composite ◽  
Element Model ◽  
Polymer Composite Material ◽  
Silicon Matrix ◽  
Organic Silicon ◽  
The Matrix ◽  
Deformed State ◽  
Plastic Components ◽  
Elastic Characteristics

Properties of polymer composite material consisting of carbon fabric and two matrix types (epoxy and organic-silicon) have been studied. The main purpose of the organic-silicon matrix is to relax stresses arising in carbon-filled plastic components under loads and to decelerate (or stop) crack growth. The structure of the composite material was determined by using a tomography. On the basis of the structure, a finite-element model was developed and a calculation of the stressed-deformed state depending on elastic characteristics of the matrix was performed. A safety factor calculation was made. It was found out that the addition of organic-silicon material in the composite composition made possible to decrease stress values in the crack tip that considerably increased the service life of such materials.

A Different Approach for Obtaining the Shear Moduliof a Composite Material

2020 ◽  
Vol 70 (12) ◽  
pp. 4470-4476
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Elastic Modulus ◽  
Shear Modulus ◽  
Finite Element Model ◽  
Element Model ◽  
Layered Composite ◽  
Element Analysis ◽  
Shear Elastic Modulus ◽  
Elastic Characteristics

In recent years the composites materials gained a major importance in all fields of engineering, because they offer a successful replacement for classical materials conferring similar elastic-mechanical properties to metal or non-metal alloys presenting several advantages such as reduced mass, chemical resistance etc. Considering this, during the design, dull knowledge of the elastic-mechanical characteristics is of high importance. The present paper aims to create a finite element model able to predict the shear elastic modulus of a double-layered composite material based on the elastic characteristics of its constituents. For this, once the elastic characteristics of the constituents determined, they could be used in the finite element analysis obtaining consequently the shear modulus for the composite material. Also, the shear elastic modulus of the resultant composite was determined experimentally. The results of the finite element model were compared to the experimental values in order to validate the finite element analyses results. Keywords: composites, fiberglass, shear modulus, FEM

scholarly journals Investigation on the transport properties of chlorides in concrete (I) Identification of ITZ

2018 ◽  
Vol 199 ◽  
pp. 02013
Author(s):  
Tian Ye ◽  
Jin Xianyu ◽  
Jin Nanguo
Keyword(s):  
Composite Material ◽  
Normal Distribution ◽  
Electron Microprobe ◽  
Concentration Distribution ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Chloride Ions ◽  
Interfacial Transition Zone ◽  
Ions Transport ◽  
Multiphase Composite

Concrete is a multiphase composite material, in which the mortar, aggregate and interfacial transition zone (ITZ) have important influence on the chloride ions transport. In this research, the thickness ITZ was measured and the concentration distribution of chloride ions in concrete was obtained through electron microprobe analysis. The experiment results that the thickness of ITZ follows a normal distribution and the size of aggregate shows no clear influence on the thickness of ITZ.

Theory of the Elastic Net Applied to Cord-Rubber Composites

1983 ◽  
Vol 56 (2) ◽  
pp. 372-389 ◽  
Author(s):  
Samuel K. Clark
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Sufficient Accuracy ◽  
Intensive Study ◽  
Rubber Composites ◽  
Structural Applications ◽  
Rubber Composite ◽  
The Subject ◽  
Composite Properties ◽  
Elastic Characteristics

Abstract There has been considerable interest over the last twenty years in the subject of the elastic properties of cord-rubber composites. This has been due to the rather intensive study of composite material characteristics, brought about by the increased use of rigid composites in many structural applications. In addition, work on the prediction of cord rubber composite properties has also continued because of the active development of finite element programs for analysis of pneumatic tire properties. These finite element programs require a thorough knowledge of cord-rubber composite elastic characteristics, which in turn are found to be considerably more difficult to calculate than had been originally thought. The present paper introduces a simplified theory for the prediction of such properties with sufficient accuracy for engineering uses.

New approach to predict the micromechanical behavior of a multiphase composite material

2014 ◽  
Vol 8 ◽  
pp. 869-873
Author(s):  
EL Guesse ◽  
M.O. Bensalah ◽  
A. Ettouhami ◽  
O. Fassi Fehri
Keyword(s):  
Composite Material ◽  
New Approach ◽  
Multiphase Composite

scholarly journals New Composite Materials With a “Liquid” Matrix

2021 ◽  
Vol 346 ◽  
pp. 02009
Author(s):  
Ekaterina Kosenko ◽  
Vladimir Nelyub
Keyword(s):  
Composite Material ◽  
Crack Growth ◽  
Strain State ◽  
Element Model ◽  
Polymer Composite Material ◽  
Dynamic Loads ◽  
Liquid Matrix ◽  
Elastomeric Matrix ◽  
Thermosetting Epoxy ◽  
Elastic Characteristics

A new polymer composite material composed of a fibre reinforced filler and two types of matrices: thermosetting (epoxy) and elastomeric (organosilicon) is introduced. The main purpose of the elastomeric matrix is stress relaxation and slowdown and prevention of crack growth in the composite material under dynamic loads, including bending and delamination. In this study, a finite element model of such composite is developed and its stress-strain state is calculated depending on the elastic characteristics of the elastomer. It was established that the addition of an elastomeric matrix in the composite allows to stop the crack growth, and significantly increase the durability of such materials.

Simulation of characteristics of composite material with «liquid» matrix

2021 ◽  
Vol 0 (11) ◽  
pp. 28-35
Author(s):  
E. A. Kosenko ◽  
◽  
V. A. Nelyub ◽  
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Theoretical Model ◽  
Crack Growth ◽  
Strain State ◽  
Load Factor ◽  
Liquid Matrix ◽  
Finite Element Software ◽  
Reinforcing Filler ◽  
Elastic Characteristics

A theoretical model of composite material consisting of a fibrous reinforcing filler, epoxy and elastomer matrices is proposed. The main purpose of the elastomer matrix is relaxation of all stresses occurring under loading and blocking the crack growth. Such elastomer matrices were named as «liquid». The calculation of the stress-strain state of the developed composite material with «liquid» matrix was carried out by using the finite-element software Ansys. It was found out that when elastic characteristics of used elestomers were less, the level of maximal stresses was less and the load factor values were higher. Decreasing stresses results in the blocking of crack growth that leads to increasing durability of such materials.

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