Strength of short‐fiber reinforced composites

Lavengood, R. E.

doi:10.1002/pen.760120108

Cited by 30 publications

(5 citation statements)

References 4 publications

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“…While the experimental curve does not look like this, the ultimate stress and strain agree well with experiment. Figure 3 shows the predicted strength for a random-in-a-plane fiber orientation, along with experimental data from a brittle matrix, glassiepoxy system (32). The prediction provides a reasonably good (and conservative) engineering estimate of the strength.…”

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confidence: 95%

Short predicting the strength and toughness of fiber composites

Kardos

Halpin

1999

Macromolecular Symposia

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Predictions of strength and toughness for short-fiber-reinforced plastic systems are complex but industrially crucial problems. In this contribution, we utilize a new approach which accounts for the large stress concentration penalties in a perfectly aligned short-fiber composite. Although empirical, the approach permits calculation of a strength reduction factor which can then be utilized with an appropriate failure criterion to calculate the strength of a wide range of short-fiber composite systems. A similar approach is used for the toughness problem, with the fracture toughness of an isotropic, random-in-aplane, short-fiber composite being expressed in terms of the fracture toughness of single unidirectionally oriented plies with cracks oriented along the two orthotropic axes. For both strength and toughness, a laminate analogy approach is used. The short-fiber system is thought of as being composed of several plies or layers, each containing uniaxially aligned short fibers. The plies are oriented in the laminate to replicate the actual system fiber orientation distribution, and the linear stress-strain or fracture toughness properties are calculated by analyzing the individual ply responses to the overall applied stress. Comparison with experimental data for random-in-a-plane fiber orientation and for biased in-plane orientations at practical fiber volume loadings shows good agreement. In the case o f fracture toughness, there was qualitative agreement between theory and experiment, but the data scatter precluded a rigorous comparison. INTRODUCTION TO THE STRENGTH PROBLEMPrediction of strength for short-fiber-reinforced plastic systems is a complex but industrially crucial problem. Even in the case of unidirectionally aligned fibers with tensile stress applied in the fiber direction, failure may occur in the fibers, in the matrix phase, or at the interface. Furthermore, failure may take place in a tensile or shear mode and may be brittle or ductile in nature. The problem of strength prediction is best illustrated in Figure 1, wherein we see that unlike for stiffness, continuous-fiber composite strengths cannot be attained in discontinuousfiber systems, even at very high aspect ratios. A second massive drop in strength occurs due solely to fiber orientation. Thus in going from a continuous aligned fiber system to a

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confidence: 95%

Short predicting the strength and toughness of fiber composites

Kardos

Halpin

1999

Macromolecular Symposia

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“…This is due to the damage to the fibers which results from the close packing at high volume fractions ofthe fibers. There exists some analytical expressions for the prediction of tensile strength of randomly oriented fiber composites, but it has been shown that these expressions do not adequately fit the experimental results (5).…”

Section: Impact Propertiesmentioning

confidence: 99%

Effect of matrix ductility and interface treatment on mechanical properties of glass fiber mat composites

Gaggar

Broutman

1976

Polymer Engineering & Sci

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The influence of matrix properties on randomly oriented glass fiber epoxy composites has been studied. It is shown that an increased ductility (flexibility) of the matrix does not result in greater elongation to failure of the composite under tensile and flexural loads. The tensile (and flexural) strength and the rnodulus of elasticity are decreased as the ductility ofthe resin is increased. It is concluded that since the matrix material is subjected to i triaxial state of stress when the composite specimen is subjected to uniaxial loads, the effect of matrix motiulus, Poisson's ratio, and yield strength are more important than the matrix ductility measured under uniaxial stress. The effect on mechanical properties of various surface treatments applied to the fibers is also investigated. Finally, scanning electron micrographs are presented showing matrix cracks, fiber debonding, and fiber pull-out.

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“…Thus these properties typically depend on properties of constituent fibers and the matrix, the dispersion and contents of reinforcement fibers, and the interfaces between the reinforcement and the matrix. There are many publications [8][9][10][11][12] dedicated exclusively to short fiber reinforced thermoplastic polymer composites, however there are a little publications related to the paper made of short fibers reinforced composites.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Silk/Bamboo Hybrid Paper Reinforced PBS Green Composite

Song

Kimura

2011

J. Text. Eng.

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In order to recycle the waste silk resource effectively, the biodegradable composite consisting of PBS matrix and silk/bamboo hybrid paper was prepared by hot compression molding. Beating treatment is adopted to modify silk fibroin and enhance the bamboo paper and the green composite, and the corresponding mechanical properties and morphologies were studied detailedly. The results showed that beating treatment could realize the fibrillation of fibroin and improve the hybrid paper's tensile strength and elongation, and proper beating treatment to fibroin could also improve the mechanical properties of silk/bamboo hybrid paper reinforced PBS composite. The tensile, flexural and impact resistance properties of this green composite were improved remarkably compared with that of PBS control.

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Strength of short‐fiber reinforced composites

Cited by 30 publications

References 4 publications

Short predicting the strength and toughness of fiber composites

Short predicting the strength and toughness of fiber composites

Effect of matrix ductility and interface treatment on mechanical properties of glass fiber mat composites

Mechanical Properties of Silk/Bamboo Hybrid Paper Reinforced PBS Green Composite

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