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

In this report we present the results from the third part of a study on the influence of fibre length (0.1–50 mm) and concentration (3–60% w/w) on the properties of glass fibre-reinforced polypropylene laminates. These laminates were prepared in the laboratory using a wet deposition method and compa...

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Bibliographic Details
Published in:	Composites. Part A, Applied science and manufacturing Vol. 27; no. 11; pp. 1075 - 1084
Main Authors:	Thomason, J.L., Vlug, M.A., Schipper, G., Krikor, H.G.L.T.
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 1996 Elsevier
Subjects:	Applied sciences Composites Exact sciences and technology fibre concentration fibre length Forms of application and semi-finished materials glass fibre Polymer industry, paints, wood polypropylene strain at failure strength Technology of polymers thermoplastic composite thermoplastic composite strength glass fibre polypropylene fibre concentration fibre length strain at failure Length Propylene polymer Concentration effect Fiber reinforced material Mechanical properties Glass fiber Composite material
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Summary:	In this report we present the results from the third part of a study on the influence of fibre length (0.1–50 mm) and concentration (3–60% w/w) on the properties of glass fibre-reinforced polypropylene laminates. These laminates were prepared in the laboratory using a wet deposition method and compared with samples prepared on a commercial melt impregnation GMT line. We found that laminate tensile strength increased linearly with fibre concentration up to 60% w/w. Laminate strength was also found to increase with increasing fibre length. At high values of fibre length (> 3–6 mm) the strength reached a plateau level which was directly dependent on fibre content. The matrix molecular weight appeared to have little direct influence on the level of laminate strength. However, the glass fibre sizing compatibility was found to have a strong effect on the tensile strength of both laboratory made wet deposited laminates and commercially prepared GMTs. The tensile strength of the GMT samples also showed a clear correlation with the measured fibre strength. A modified version of the Kelly-Tyson model gave calculated values of laminate strength which correlated well with the experimental data. We propose that the tensile strength of these laminates is governed by the properties of the fibres which have an orientation close to parallel with the loading direction.
ISSN:	1359-835X 1878-5840
DOI:	10.1016/1359-835X(96)00066-8