Influence of fibre length and concentration on the properties of glass fibre-reinforced polypropylene: 1. Tensile and flexural modulus

Thomason, James; Vlug, M.A.

doi:10.1016/1359-835x(95)00065-a

Cited by 365 publications

(231 citation statements)

References 19 publications

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“…This analysis yields orientation factors of the order of the same order of magnitude as those obtained from the macro-method. We note that the < cos 4 (φ) > factor also appears to work well in the prediction of the stiffness of compression moulded Glass Mat Thermoplastic (GMT) (26). Figure 12 shows the values obtained by the macromechanical analysis for the fibre stress at composite failure.…”

Section: Macromechanical Analysis Methodsmentioning

confidence: 99%

“…It is likely that the values of < cos 2 (φ) > are significantly higher than the values from the macromechanical analysis, however there is no sound theoretical hypothesis that these values should be equivalent. In fact, only the orientation factor η o =< cos 4 (φ) > from the Cox-Krenchel analysis of composite modulus might be expected to match the macromechanical orientation parameter obtained from the modulus values (25,26,34). These values can also be calculated from the same data used to calculate < cos 2 (φ) > and are also shown in Table 1.…”

Section: Macromechanical Analysis Methodsmentioning

confidence: 99%

“…We can use the fibre length data reported later in Figure 6 to calculate the η l factor (average = 0.9) using the Cox shear lag method (25,26) which then gives a remaining value of η ο E f of 47.9 GPa, resulting in an η ο value of 0.67 when E f = 72 GPa. This is in the same range (0.65-0.72) recently reported for Polyamide 6,6 and PBT based injection moulded composites (27,28).…”

Section: Composite Propertiesmentioning

confidence: 99%

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Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Thomason¹

2002

Composites Science and Technology

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In recent years many elegant techniques have been developed for the quantification of composite micromechanical parameters. Unfortunately most of these techniques have found little enthusiastic support in the industrial product development environment. We have developed an improved method for obtaining the micromechanical parameters, interfacial shear strength, fibre orientation factor, and fibre stress at composite failure using input data from macromechanical tests. In this paper we explore this method through its application to injection moulded glass-fibre-reinforced thermoplastic composites. We have measured the mechanical properties and residual fibre length distributions of glass fibre reinforced polypropylene containing different levels of glass fibre. The level of fibre-matrix interaction in these composites was varied by the addition of maleic anhydride modified polypropylene "coupling agent". This data was used as input for the model. The trends observed for the resultant micromechanical parameters obtained by this method were in good agreement with values obtained by other methods. Given the wealth of microstructural information obtained from this macroscopic analysis and the low level of resources employed to obtain the data we believe that this method deserves further investigation as a screening tool in composite system development programmes.

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Section: Macromechanical Analysis Methodsmentioning

confidence: 99%

Section: Macromechanical Analysis Methodsmentioning

confidence: 99%

Section: Composite Propertiesmentioning

confidence: 99%

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Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Thomason¹

2002

Composites Science and Technology

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“…There are several mechanical models that describe the modulus of a composite as a function of filler content [27,28]. The Halpin-Tsai model calculates the elastic modulus of a fiber composite with randomly oriented fibers as a function of fiber content and aspect ratio [27][28][29][30]. The Halpin-Tsai model has been applied to semicrystalline polymers [31] as well as to segmented block copolymers [3,15], and was chosen for modeling the modulus in the present study.…”

Section: Dmtamentioning

confidence: 99%

Section: Dmtamentioning

confidence: 99%

Tensile properties of segmented block copolymers with monodisperse hard segments

2008

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The tensile properties of segmented block copolymers with mono-disperse hard segments were studied with respect to the hard segment content (16-44 wt.%) and the temperature (20-110°C). The copolymers were comprised of poly(tetramethylene oxide) segments with the molecular weights of 650-2,900 Da and of mono-disperse bisester-tetra-amide segments (T6A6T) based on adipic acid (A), terephthalic acid (T) and hexamethylene diamine (6). An increasing content of T6A6T gave rise to an increased modulus, yield stress and fracture stress. The modulus could be modeled by a composite model. Moreover, a strain-softening was observed well below the yield stress, due to the shearing of the T6A6T crystallites. At strains [200%, a strain-hardening of the PTMO segments took place and this even for PTMO segments that were amorphous in the isotropic state. The strain hardening increased the tensile properties. An increase in temperature had little effect on the modulus of the copolymers, but was found to lower the yield and fracture stresses. At temperatures above the melting temperature of the oriented PTMO, no strain-hardening took place. The yield stress as a function of temperature could be described by the Eyring relationship, but a modulus-yield stress relationship could not be established.

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Long Biofibers and Engineered Pulps for High Performance Bioplastics and Biocomposites

Fernyhough

Markotsis

2011

Handbook of Bioplastics and Biocomposites Engineering Applications

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Influence of fibre length and concentration on the properties of glass fibre-reinforced polypropylene: 1. Tensile and flexural modulus

Cited by 365 publications

References 19 publications

Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Tensile properties of segmented block copolymers with monodisperse hard segments

Long Biofibers and Engineered Pulps for High Performance Bioplastics and Biocomposites

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