Influence of fibre length and concentration on the properties of glass fibre-reinforced polypropylene: Part 3. Strength and strain at failure

Thomason, James; Vlug, M.A.; Schipper, G.; Krikor, H.

doi:10.1016/1359-835x(96)00066-8

Cited by 230 publications

(132 citation statements)

References 15 publications

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“…However, these values are of the same order of magnitude as those recently reported by Thomason and Kalinka for the tensile strength (1500-2000 MPa) at short gauge lengths of E-glass fibres removed from chopped glass bundles similar to the input materials in this study (13). Fibre strength may be reduced significantly after fibre formation by damage caused during both the fibre and composite production processes (13)(14)(15). Although there is little available published data on the direct measurement of the residual strength of fibres in a moulded composite part, there is a growing body of indirect evidence indicating that the strength of glass fibres has been significantly reduced by the time that they actually become the load bearing component of a composite (13)(14)(15)(16).…”

Section: Resultssupporting

confidence: 55%

“…Thomason et al have recently demonstrated the wide range of fibre strength to be found in fibres used in GMT. Differences in fibre strength were attributed to different levels of processing damage and fibre sizing protection efficiency (15). They reported values for average E-glass fibre strength as low as 1100 MPa in fibres extracted from commercial GMT's.…”

Section: Resultsmentioning

confidence: 99%

“…Fibre strength may be reduced significantly after fibre formation by damage caused during both the fibre and composite production processes (13)(14)(15). Although there is little available published data on the direct measurement of the residual strength of fibres in a moulded composite part, there is a growing body of indirect evidence indicating that the strength of glass fibres has been significantly reduced by the time that they actually become the load bearing component of a composite (13)(14)(15)(16). Thomason et al have recently demonstrated the wide range of fibre strength to be found in fibres used in GMT.…”

Section: Resultsmentioning

confidence: 99%

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Interfacial strength in thermoplastic composites - at last an industry friendly measurement method?

Thomason¹

2002

Composites Part A: Applied Science and Manufacturing

119

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Many elegant techniques have been developed for the quantification of composite micromechanical parameters in recent years. Unfortunately most of these techniques have found little enthusiastic support in the industrial product development environment, where they are viewed as time consuming, complex, inefficient, labour intensive, and in many cases unproven or inapplicable in 'real' systems. Despite this reaction, there is a real need for a 'user-friendly' micro-mechanics to aid the composites industry to move to the next level of development. A method for deriving values for τ (the interfacial shear strength) and η o (a fibre orientation factor) from a simple combination of the composite tensile stress-strain curve and the fibre length distribution has been available for some time. Despite the recent wealth of activity in the development of micro-mechanical test techniques there has been little follow-up on this older technique. In this paper we explore this analysis by its application to injection moulded glassfibre-reinforced thermoplastic composites produced using three matrices (polypropylene, polyamide 6,6 and polybutyleneterepthalate) and containing different levels of glass-fibre. We furthermore show how the analysis can be extended to obtain another important micromechanics parameter, σ uf -the fibre stress at composite failure. Values of τ and η o obtained using this improved version of the original model are presented and discussed.

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Interfacial strength in thermoplastic composites - at last an industry friendly measurement method?

Thomason¹

2002

Composites Part A: Applied Science and Manufacturing

119

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“…Thomason et al have also recently demonstrated the wide range of fibre strength to be found in fibres used in GMT. Differences in fibre strength were attributed to different levels of processing damage and fibre sizing protection efficiency (19). They reported values for average E-glass fibre strength as low as 1.1 GPa in fibres extracted from commercial GMT's.…”

Section: Macromechanical Analysis Methodsmentioning

confidence: 99%

“…Fibre strength may be reduced significantly after fibre formation by damage caused during both the fibre and composite production processes (16,17). Although there has not been any direct measurement of the residual strength of fibres in a moulded composite part, there is a growing body of indirect evidence that the strength of glass fibres may be significantly reduced by the time that they actually become the load bearing component of a composite (3,7,(16)(17)(18)(19). The ability to transfer stress across the fibre-matrix interface is often reduced to a discussion of 'adhesion' which is a simple term to describe a combination of complex phenomena on which there is still significant debate as to what it means and how to measure it.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Thomason¹

2002

Composites Science and Technology

Self Cite

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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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Fabrication and mechanical properties of glass fiber‐reinforced wood plastic hybrid composites

Cui

Tao

2009

J of Applied Polymer Sci

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To fully utilize the resource in the municipal solid waste (MSW) and improve the strength and toughness of wood plastic composites, glass fiber (GF)-reinforced wood plastic hybrid composites (GWPCs) were prepared through compounding of recycled high-density polyethylene (HDPE) from MSW, waste wood fibers, and chopped GF. Mechanical tests of GWPCs specimens with varying amounts of GF content were carried out and the impact fractured surface of GWPCs was observed through scanning electron microscope (SEM). The tensile strength of GWPCs and the efficiency coefficient values were predicted by Kelly-Tyson method. The results indicated that the tensile strength and impact strength of GWPCs could be improved simultaneously by adding type L chopped GF (L-GF), and would be dropped down when type S chopped GF (S-GF) was included. The tensile strength of GWPCs was well accordant with the experimental result. The efficiency coefficient values of S-GF and L-GF are À0.19 and 0.63, respectively. Inspection of SEM micrographs indicated that L-GF had achieved full adhesion with the plastic matrix through addition of maleic anhydride-g-polyethylene. The main fracture modes of GWPCs included pullout of GF, broken of matrix, and interfacial debonding. Because of the synergistic effects between hybrid components in GF/wood fiber/ HDPE hybrid system, a special 3D network microstructure was formed, which was the main contribution to the significant improvement in the tensile strength and impact strength of L-GF-reinforced hybrid composites.

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Influence of fibre length and concentration on the properties of glass fibre-reinforced polypropylene: Part 3. Strength and strain at failure

Cited by 230 publications

References 15 publications

Interfacial strength in thermoplastic composites - at last an industry friendly measurement method?

Interfacial strength in thermoplastic composites - at last an industry friendly measurement method?

Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Fabrication and mechanical properties of glass fiber‐reinforced wood plastic hybrid composites

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