A lower bound of longitudinal elastic modulus for three-phase fibrous composites

2017 ◽  
Vol 24 (1) ◽  
pp. 72-84
Author(s):  
J Venetis ◽  
E Sideridis
Keyword(s):  
Experimental Data ◽  
Elastic Modulus ◽  
Composite Materials ◽  
Lower Bound ◽  
Polymer Composite ◽  
Differential Calculus ◽  
Reasonable Agreement ◽  
Theoretical Models ◽  
Three Phase ◽  
Longitudinal Elastic Modulus

A lower bound of the longitudinal elastic modulus of polymer composite materials reinforced with unidirectional continuous fibres is obtained by means of a Differential Calculus approach. In the mathematical derivations, the concept of interphase between the fibre and matrix was also taken into consideration. The three phases are considered as isotropic. The results obtained from the proposed formula were compared with those arising from some reliable and accurate theoretical models as well as with experimental data found in the literature, and a reasonable agreement was observed.

scholarly journals An Upper Bound of Longitudinal Elastic Modulus for Unidirectional Fibrous Composites as Obtained from Strength of Materials Approach

2018 ◽  
Author(s):  
John Venetis ◽  
Emilio Sideridis
Keyword(s):  
Elastic Modulus ◽  
Upper Bound ◽  
Theoretical Models ◽  
The Novel ◽  
Fibrous Composites ◽  
Strength Of Materials ◽  
Fiber Concentration ◽  
Longitudinal Elastic Modulus ◽  
The Matrix ◽  
Specific Variation

In this paper, an upper bound of the longitudinal elastic modulus of  unidirectional   fibrous composites is proposed according to strength of materials approach, on the premise that the fiber is much stiffer than the matrix. In the mathematical derivations, the concept of boundary interphase between fiber and matrix was also taken into account and the main objective of this work is the attainment of an upper bound for the interphase stiffness with respect to fiber concentration by volume. The novel element here is that the authors have not taken into consideration any specific variation law to approximate the interphase modulus. The theoretical results arising from the proposed formula were compared with those obtained from some reliable theoretical models as well as with experimental data found in the literature, and a satisfactory agreement was observed.

On the sensitivity of large precision space structures of high-modulus fibrous polymer composite materials to microdynamical effects

2020 ◽  
Author(s):  
S.N. Sayapin
Keyword(s):  
Elastic Modulus ◽  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Space Structures ◽  
High Modulus ◽  
Abrupt Increase ◽  
Orbital Flight ◽  
Fibrous Polymer ◽  
Fibrous Polymer Composite

The paper considers the problem of sensitivity of large precision space structures made of high-modulus fibrous polymer composite materials to external and internal microdynamic effects. This problem is related to the extent of structure forming elements, as well as to an abrupt increase in the elastic modulus of the material when passing the threshold of low stresses. It is found that under low loading in the orbital flight conditions the calculated values of the elastic modulus of large precision space structures made of high-modulus fibrous polymer composite materials may be higher than the real ones by more than 20 times, which must be taken into account in the calculations. Possible ways to reduce the sensitivity of such space structures made of high-modulus fibrous polymer composite materials to external and internal microdynamic effects are shown.

scholarly journals Experimental study on mechanical properties for a three-phase polymer composite reinforced by glass fibers and titanium oxide particles

2011 ◽  
Vol 33 (2) ◽  
pp. 105-112 ◽  
Author(s):  
Nguyen Dinh Duc ◽  
Dinh Khac Minh
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Titanium Oxide ◽  
Polymer Composite ◽  
Glass Fibers ◽  
Three Phase ◽  
Oxide Particles ◽  
Elastic Modules ◽  
Theoretical Results ◽  
Good Agreement

Nowadays, composite materials are applied in many fields. The physico-mechanical properties of the material can be improved by adding reinforced fibers and particles. Many scientists pay attention to the calculation for elastic modules of three-phase composite materials. This report presents the experimental results for some elastic modules of three-phase polymer composite reinforced with glass fibers and titanium oxide particles of different volume ratios. A comparison between experimental and theoretical results shows good agreement.

scholarly journals Experimental study of the correlation between the elastic modulus of polymer composite materials and the velocity of ultrasonic waves

2020 ◽  
Vol 329 ◽  
pp. 02031
Author(s):  
Dmitrii Chulkov ◽  
Alexander Terekhin ◽  
Alexander Dumansky ◽  
Maxim Tipikin
Keyword(s):  
Experimental Study ◽  
Elastic Modulus ◽  
Composite Materials ◽  
Polymer Composite ◽  
Phenol Formaldehyde ◽  
Ultrasonic Waves ◽  
Polymer Composite Materials ◽  
Significant Regression ◽  
Relationship Of ◽  
The Relationship

This article presents the results of an experimental study of the relationship of acoustic parameters (propagation velocity) of ultrasonic waves with elastic characteristics (elastic modulus) of polymer composite materials. Significant regression dependences of the correlation between the velocity of ultrasonic won and the modulus of elasticity of a composite material based on fiberglass with an epoxy and phenol-formaldehyde binder have been constructed.

scholarly journals Prediction of elastic modulus and mid-span deflection of bamboo-wood composite laminates

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 7784-7798
Author(s):  
Aonan Chen ◽  
Yi Liang ◽  
Zhilin Jiang ◽  
Jianping Sun
Keyword(s):  
Elastic Modulus ◽  
Composite Materials ◽  
Composite Laminates ◽  
Adhesive Layer ◽  
Wood Composite ◽  
Height Ratio ◽  
Shear Theory ◽  
Longitudinal Elastic Modulus ◽  
Novel Method ◽  
Properties Of Materials

To better guide the manufacturing of bamboo-wood composite laminates, classical theory, first-order shear theory, and finite element method were used to predict the elastic modulus and deflection of bamboo-wood composite laminates. The influence of the adhesive layer on the elastic modulus and deflection of composite materials was considered. The effect of transverse shear on the mechanical properties of materials became smaller and smaller with an increasing span-to-height ratio. The effects of the adhesive layer on the elastic modulus and deflection were ± 0.5% and -0.1% to 0.3%, respectively. The transverse elastic modulus and mid-span deflection predicted by the three methods were quite different from the experimental results. When the span-to-height ratio was equal to 20, the prediction error of longitudinal elastic modulus by the three methods was less than 6%, which can be used to predict the elastic modulus of composite materials. The results provide a novel method to predict the properties of bamboo-wood composite laminates.

FSUE "VIAM" solvent-free binders for polymer composite materials

2016 ◽  
Vol 2 (2) ◽  
pp. 37-42 ◽  
Author(s):  
E. N. Kablov ◽  
L. V. Chursova ◽  
A. N. Babin ◽  
R. R. Mukhametov ◽  
N. N. Panina
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Solvent Free ◽  
Polymer Composite Materials
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