In order to study the short- and long-term creep behaviours of injection moulded, unreinforced and glass fibre reinforced polypropylene composites, tensile and creep measurements were carried out and analysed. Based on the linear viscoelastic behaviour and variable transformations as well as Weibull-based distribution characterisation, estimations for the tensile strength parameters and creep failure strain were determined and fitted to the measurements. These mathematical estimations and the relationships between the material model czonstants and the fibre content, determined by fitting, give a possibility for designers’ calculations at arbitrary creep load levels and fibre contents.
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