Stiffness of Non-Aligned Fiber Reinforced Composites

Lavengood, R. E.; Goettler, Lloyd A.

doi:10.21236/ad0886372

Cited by 21 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To analyze the effect of CNT waviness on the moduli of the nanocomposite, six different cases with volume fraction varying from 0.1 to 1% are chosen. Since the CNTs are oriented in random fashion within the matrix, the elastic modulus in x, y, and z-direction are expected to be nearly equal, i.e., the composite will be quasi-isotropic [57]. Figure 7 shows the stress-strain response for the model with v f = 1% and θ max = 20° for uniaxial loading in x, y, and z-direction.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Three-Dimensional Stochastic Modelling of Wavy Carbon Nanotube Reinforced Epoxy Nanocomposites

Chahal

Adnan

2020

Multiscale Sci. Eng.

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

“…Halpin-Tsai used semianalytical method to reduce the equations for aligned short fiber composites. Lavengood and Goettler [57] later used stress transformation equations and integrated the equations over a random distribution of fiber orientations and obtained the Eqs. (2) and (3).…”

Section: Resultsmentioning

confidence: 99%

Three-Dimensional Stochastic Modelling of Wavy Carbon Nanotube Reinforced Epoxy Nanocomposites

Chahal

Adnan

2020

Multiscale Sci. Eng.

View full text Add to dashboard Cite

“…Thus the Halpin-Tsai equations [27], which can fit the experimental results well for the short fiber reinforced composites with low fiber volume fractions, are employed to establish the relation between the flexural strength of NFREPC and the tensile strength of natural fibers. Assuming that the natural fibers are uniformly dispersed in the NFREPC with random orientation and a good bonding between the fibers and matrix is achieved, the Halpin-Tsai equations can be used to predict the modulus of composite [28]: where E c represents the modulus of composite. E m and E f are the modulus of polymer matrix and fiber, respectively.…”

Section: Reinforcing Mechanismsmentioning

confidence: 99%

Enhanced flexural performance of epoxy polymer concrete with short natural fibers

Zhang

Liao

et al. 2018

Sci. China Technol. Sci.

View full text Add to dashboard Cite

Epoxy polymer concrete (EPC) has found various applications in civil engineering. To enhance the flexural performance of EPC, two kinds of short natural fibers with high specific strength (sisal fibers and ramie fibers) have been incorporated into EPC. The results of mechanical tests show that a small loading of natural fibers (0.36 vol%) can significantly increase the flexural strength of EPC by 25.3% (ramie fibers) or 10.4% (sisal fibers). This enhancement is achieved without any sacrifice of compressive strength of EPC. The reinforcing effects of short natural fibers on the flexural properties and compressive properties of EPC decrease with further increase in fiber content, due to the insufficient wetting of fibers by epoxy resin which results in poor interfacial bonding. The reinforcing mechanisms of short natural fibers are explored according to the observation of fracture surfaces and micromechanical modelling. It is found that the parallel model based on the rule of mixture can be a good approximation to describe the improvement in flexural strength of the short natural fiber reinforced EPC at low fiber volume fractions. epoxy polymer concrete (EPC), natural fibers, flexural strength, micromechanics models

show abstract

“…Finally, following the work of Lavengood and Goettler (1971); López et al (2012); Serrano et al (2014); Mortazavian and Fatemi (2015), the isotropic behavior, resulting from the random distribution of the orthotropic layered material, can be approximated by Eq. (3).…”

Section: The Aggregate Modelmentioning

confidence: 99%

Experimental and computational micro-mechanical investigations of compressive properties of polypropylene/multi-walled carbon nanotubes nanocomposite foams

Wan¹,

Tran

Leblanc

et al. 2015

Mechanics of Materials

View full text Add to dashboard Cite

The compressive behavior of nanocomposite foams is studied by both experimental and computational micro-mechanics approaches with the aim of providing an efficient computational model for this kind of material.The nanocomposites based on polypropylene (PP) and different contents of multi-walled carbon nanotubes (CNTs) method. The nanocomposite samples are foamed using super-critical carbon dioxide (ScCO 2 ) as blowing agent at different soaking temperatures. The influence of this foaming parameter on the morphological characteristics of the foam micro-structure is discussed. Differential Scanning Calorimetry (DSC) measurements are used to quantify the crystallinity degree of both nanocomposites and foams showing that the crystallinity degree is reduced after the foaming process. This modification leads to mechanical properties of the foam cell walls that are different from the raw nanocomposite PP/CNTs material. Three-point bending tests are performed on the latter to measure the flexural modulus in terms of the crystallinity degree. Uniaxial compression tests are then performed on the foamed samples under quasi-static conditions in order to extract the macro-scale compressive response. Next, a two-level multi-scale approach is developed to model the behavior of the foamed nanocomposite material. On the one hand, the micromechanical properties of nanocomposite PP/CNTs cell walls are evaluated from a theoretical homogenization model accounting for the micro-structure of the semi-crystalline PP, for the degree of crystallinity, and for the CNT volume fraction. The applicability of this theoretical model is demonstrated via the comparison with experimental data from the described experimental measurements and from literature. On the other hand, the macroscopic behavior of the foamed material is evaluated using a computational micromechanics model using tetrakaidecahedron unit cells and periodic boundary conditions to estimate the homogenized properties. The unit cell is combined with several geometrical imperfections in order to capture the elastic collapse of the foamed material. The numerical results are compared to the experimental measurements and it is shown that the proposed unit cell computational micro-mechanics model can be used to estimate the homogenized behavior, including the linear and plateau regimes, of nanocomposite foams.

show abstract

Stiffness of Non-Aligned Fiber Reinforced Composites

Cited by 21 publications

References 0 publications

Three-Dimensional Stochastic Modelling of Wavy Carbon Nanotube Reinforced Epoxy Nanocomposites

Three-Dimensional Stochastic Modelling of Wavy Carbon Nanotube Reinforced Epoxy Nanocomposites

Enhanced flexural performance of epoxy polymer concrete with short natural fibers

Experimental and computational micro-mechanical investigations of compressive properties of polypropylene/multi-walled carbon nanotubes nanocomposite foams

Contact Info

Product

Resources

About