A novel characterization method of fiber reinforced polymers with clustered microstructures for time dependent mass transfer

2018 ◽  
Vol 25 (5) ◽  
pp. 1003-1014
Author(s):  
Deepak Jain ◽  
Abhijit Mukherjee ◽  
Tarun Kumar Bera
Keyword(s):  
Volume Fraction ◽  
Moisture Diffusion ◽  
Time Dependent ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Reinforced Polymers ◽  
The Matrix ◽  
Quantitative Definition ◽  
Dependent Mass

AbstractSome variation in the topological distribution of fibers inside the matrix phase of fiber reinforced polymers (FRP) is inevitable. Such irregularities can accelerate moisture diffusion and adversely affect the life of FRP. This paper presents a hierarchical technique for characterization of clustered microstructures and their transient moisture diffusion response. The clustering descriptors are derived for different fiber volume fractions (dilute to dense) for the quantitative definition of a given fiber matrix architecture. The metrics are normalized to remove dependence on volume fraction. The microstructures are analyzed for Fickian moisture diffusion. Suggested descriptors show a good correlation with transient diffusion response in relation to saturation time. The results can be used to predict the time-dependent moisture diffusion response of FRPs for any given fiber volume fraction.

Material Characterization for Constituents of Fiber Reinforced Polymers by Experiments and Prediction of Effective Composite Properties

2017 ◽  
Vol 742 ◽  
pp. 714-722
Author(s):  
Joseph Goldmann ◽  
Markus Kaestner ◽  
Volker Ulbricht
Keyword(s):  
Single Fiber ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Present Contribution ◽  
Reinforced Polymers ◽  
Glass Fiber Reinforced ◽  
The Matrix ◽  
Fiber Fragmentation ◽  
The One ◽  
Composite Properties

The present contribution aims to investigate the ability of drawing predictive conclusions from homogenization in case of damage. Therefor, two topics will be addressed. On the one hand, material properties for the constituents on the microscale have to be derived, to render a predictive homogenization possible. The investigation at hand is concerned with glass fiber reinforced epoxy resin. In this example the properties of the fiber and the matrix have to be studied individually by experiments. Furthermore, the interface between both materials needs to be examined. To this end experiments on several models of single fiber composites have been developed in the literature. For the present material combination single fiber fragmentation tests and pullout tests have been conducted and evaluated. On the other hand, boundary conditions are necessary, that allow for the strain localization in a volume element without leading to spurious localization zones.

scholarly journals Prediction of Orthotropic Hygroscopic Swelling of Fiber-Reinforced Composites from Isotropic Swelling of Matrix Polymer

2019 ◽  
Vol 3 (1) ◽  
pp. 10 ◽  
Author(s):  
Andrey Krauklis ◽  
Abedin Gagani ◽  
Andreas Echtermeyer
Keyword(s):  
Volume Fraction ◽  
Fiber Reinforced Composites ◽  
Fiber Direction ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Element Analysis ◽  
Matrix Polymer ◽  
Hygroscopic Swelling ◽  
The Matrix

Swelling in fiber-reinforced composites is anisotropic. In this work, dealing with glass fiber epoxy composite immersed in distilled water, swelling coefficients are obtained in each direction experimentally. Swelling behaviour in the fiber direction was constrained by the non-swelling fibers and was close to null, while swelling in the transverse directions was found to occur freely—similar to the unconstrained polymer. An analytical method for predicting anisotropic swelling in composites from the swelling of the matrix polymer is reported in this work. The method has an advantage that it is simple to use in practice and requires only a swelling coefficient of the matrix polymer, elastic constants of the matrix and fibers, and a known fiber volume fraction of the composite. The method was validated using finite element analysis. Good agreement was obtained and is reported between experimental hygroscopic swelling data, analytical and numerical results for composite laminates, indicating the validity of this predictive approach.

Modeling the Anisotropic Finite-Deformation Viscoelastic Behavior of Soft Fiber-Reinforced Tissues

2007 ◽  
Author(s):  
Thao D. Nguyen ◽  
Reese E. Jones ◽  
Brad L. Boyce
Keyword(s):  
Viscous Flow ◽  
Finite Deformation ◽  
Composite Structures ◽  
Volume Fraction ◽  
Viscoelastic Behavior ◽  
Time Dependent ◽  
Flow Rule ◽  
Fiber Reinforced ◽  
Dependent Behavior ◽  
The Matrix

This paper presents a constitutive model for the anisotropic, finite-deformation viscoelastic behavior of soft fiber-reinforced tissues. Soft fiber-reinforced tissues, such as the cornea, tendons, and blood vessels, have a unique combination of mechanical properties that enables them to perform important structural, protective, and energy-absorbing functions. Because of their fiber-reinforced microstructure, these tissues are extraordinarily stiff and strong for their weight. Many are also flexible and tough. The toughness of these tissues arises from the ability of both the soft fiber and matrix phases to dissipate energy through large viscoelastic deformations. The viscoelastic behavior of the matrix of soft tissues can arise from fluid flow through a swollen polymer network and/or the diffusive motion of polymer segments within the network. The time-dependent behavior of the fiber reinforcements, which themselves can be composite structures, stems from the viscoelastic nature of the fiber material and/or the dissipative mechanisms of the fiber/matrix interface. To model the distinct time-dependent behavior of both fiber and matrix constituents, the tissue is represented as a continuum mixture consisting of a variety of fiber families embedded in an isotropic matrix. Both phases are required to deform with the continuum deformation gradient. However, the model attributes a different viscous stretch measure and free energy density to the matrix and fiber phases. Separate viscous flow rules are specified for the matrix phase and the individual fiber families. The flow rules for the fiber families are combined to give an anisotropic effective viscous flow rule for the fiber phase. An attractive feature of model is that key parameters can be related to the material properties (i.e., moduli, viscosities, volume fraction) of the fiber and matrix phases. Also, the anisotropy exhibited by both the elastic and viscous response of the composite arises directly from the fiber arrangement.

scholarly journals Transverse Thermal Conductivity of Epoxy Carbon Fiber Prepreg Laminates with a Graphite Filled Matrix

2019 ◽  
Vol 3 (2) ◽  
pp. 44 ◽  
Author(s):  
Simon Bard ◽  
Martin Demleitner ◽  
Marius Radtke ◽  
Volker Altstädt
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
New Technologies ◽  
Fiber Reinforced Polymers ◽  
Fiber Volume ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
The Matrix ◽  
Thermally Conductive ◽  
Transverse Thermal Conductivity

The thermal conductivity of carbon fiber reinforced polymers is crucial for new technologies and is used in cutting-edge technologies such as sensors, heated rollers and anti-icing of airplane wings. Researchers so far focused on coating conventional prepregs with thermally conductive materials to enhance the transversal conductivity. Another strategy is followed in this study: Thermally conductive matrices filled with graphite platelets were processed by a laboratory prepreg line. Laminates produced from this type of prepregs show an enhancement in thermal conductivity by 3.3 times with a 20 vol% filler content relative to the matrix, and a 55 vol% fiber volume content in the laminate. The research shows that the incorporation of conductive particles in the matrix is more effective for increasing the conductivity than previous methods.

scholarly journals A multi‐scale fatigue‐damage model for fiber‐reinforced polymers

PAMM ◽  
2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Nicola Magino ◽  
Jonathan Köbler ◽  
Heiko Andrä ◽  
Matti Schneider ◽  
Fabian Welschinger
Keyword(s):  
Fatigue Damage ◽  
Damage Model ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Multi Scale
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