Effect of Fiber Orthotropy on Effective Composite Properties

Knott, Tamara; Herakovich, Carl T.

doi:10.1177/002199839102500607

Cited by 21 publications

(5 citation statements)

References 5 publications

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“…The second approach used to predict

G_{12}

was based on an elasticity model, known as composite cylinder assemblage (CCA) model. [ 27–29 ] Representative volume element for the CCA model is a single solid cylinder (i.e., filament) surrounded by cylindrical matrix, which is arranged in a hexagonal packing pattern that can cover

V_{f}

up to 91%. [ 30 ]…”

Section: Approaches Used In the Studymentioning

confidence: 99%

Prediction of quasi‐static elastic modulus for polyethylene‐terephthalate‐glycol prepared from fused deposition modeling

Cui

Jar

2023

SPE Polymers

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This article is concerned about change of elastic modulus as a function of raster angle used in the fused deposition modeling and applicability of laminate theory to prediction of the elastic modulus. Polyethylene terephthalate glycol (PETG) was used for the experimental testing. In view that PETG shows viscous deformation which was not considered in the laminate theory, quasistatic (QS) component of the elastic modulus was used to examine the applicability of laminate theory, which was achieved by extraction of the QS stress response to deformation through stress relaxation and then finite element modeling of the slope for the load-displacement curve before the relaxation. Two analytical approaches were used to examine the laminate theory. One was known as the mechanics of materials approach that considers matrix properties from the intralayer regions, and the other the elasticity model approach that also considers the interlayer regions. The study found that both approaches provided reasonable estimation of the QS elastic modulus but their values were slightly over the measured values. We provide evidence to suggest that the prediction accuracy could be improved by considering the change of interlayer filament contact with the change of raster angle.

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“…The second approach used to predict

G_{12}

V_{f}

up to 91%. [ 30 ]…”

Section: Approaches Used In the Studymentioning

confidence: 99%

Prediction of quasi‐static elastic modulus for polyethylene‐terephthalate‐glycol prepared from fused deposition modeling

Cui

Jar

2023

SPE Polymers

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“…Porosity and permeability are intricately related to the type of reinforcement, stacking sequence, and clamping pressure [13,14]. A quality index similar to that in Table 6 can be constructed for the reinforcements used in the RTM process.…”

Section: Stacking Sequence/porosity/permeabilitymentioning

confidence: 99%

Quality Evaluation of Resin Transfer Molded Products

Babu

Prabhakaran

Agrawal

2008

Journal of Reinforced Plastics and Composites

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The present study introduces a new procedure to evaluate the quality of composite products using the graph theoretic approach, and a composite screw rotors process is considered (manufactured by the Resin Transfer Molding (RTM)). The composite product coming from the manufacturing processes must have good surface finish and high quality without any defects. There are several factors which affect the quality during design and manufacture of the RTM products like screw rotors. These factors form a quality digraph based on the interactions existing between them. Hence, we considered the quality digraph by defining fuzzy crisp scores for the degree of interactions between the factors. A quality index derived from quality permanent function is helpful for quality inspectors on the shop floor to decide whether the product is within benchmark limits. The benchmark limits obtained for the composite product, manufactured by the RTM process by considering the strong and weak interactions existing between the factors defined for quality, are considered as upper and lower bounds in deriving the indices. Therefore the present work proposes a quality index, which is a useful numerical index for quality assurance groups to take proper decisions on the shop floor for the manufacturing process adapted to composites (composite molders).

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“…Polyacrylonitrile (PAN) based fibers generally exhibit circumferential alignment of the graphite basal planes, while pitch-based fibers typically have radial alignment. Random orientation of the graphite basal planes in the transverse plane of the fiber would result in a transversely isotropic fiber, or in a narrow zone of the fiber would result in a transversely isotropic core in the fiber [4,5]. The fibers with such microstructures can be idealized as cylindrically orthotropic fibers with a transversely isotropic core, if any.…”

Section: Introductionmentioning

confidence: 99%

“…Several researches about cylindrically orthotropic fibers or cylinders were carried out based on this model. Knott and Herakovich [5] considered the existence of the isotropic core in the effective elastic properties of fiber composites. Rodriguez and Cabeza [6] studied the combination of the effects of the core with the cylindrical orthotropy of the fiber on the effective thermal conductivity using a finite element method.…”

Section: Introductionmentioning

confidence: 99%

A complex variable solution of two-dimensional heat conduction of composites reinforced with periodic arrays of cylindrically orthotropic fibers

Peng

Jiang

Song

2010

Computational Materials Science

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a b s t r a c tProblems of two-dimensional steady-state heat conduction for composites with doubly periodic arrays of cylindrically orthotropic fibers are dealt with. A new complex variable method is presented by introducing an appropriate coordinate transformation to convert the governing differential equation into a harmonic one, and the eigenfunction expansions of the field variables in a unit cell are derived. Then by using a generalized variational functional which absorbs the periodicity condition, an eigenfunction expansion-variational method based on a unit cell is developed to solve such problems. A convergence analysis and a comparison with finite element calculations are conducted to demonstrate the correctness and efficiency of the present method. A discussion is made about the effects of the cylindrical orthotropy of the fiber and the existence of the isotropic core in the fiber on the effective conductivity of the composite. An engineering equivalent parameter, which reflects the overall influence of the thermal conductivities of the matrix and fibers as well as the interfacial characteristic on the effective thermal conductivity of the composite, is found. It is shown that the present first-order approximation of the effective thermal conductivity of the composite can be written in a unified formula for different microstructural characteristics and possesses a good engineering accuracy.

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Effect of Fiber Orthotropy on Effective Composite Properties

Cited by 21 publications

References 5 publications

Prediction of quasi‐static elastic modulus for polyethylene‐terephthalate‐glycol prepared from fused deposition modeling

Prediction of quasi‐static elastic modulus for polyethylene‐terephthalate‐glycol prepared from fused deposition modeling

Quality Evaluation of Resin Transfer Molded Products

A complex variable solution of two-dimensional heat conduction of composites reinforced with periodic arrays of cylindrically orthotropic fibers

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