A Comparison between Forming Behaviours of Two Pre-Consolidated Woven Thermoplastic Composites
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Akhavan Zanjani, Nima
Kalyanasundaram, Shankar
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Scientific Research Publishing
Abstract
This paper presents the results of an investigation on stretch forming behaviour of two consolidated woven thermoplastic composites: a self-reinforced polypropylene (SRPP) and a glass-fibre reinforced polypropylene (GRPP) composite. A custom-built press with a hemispherical punch
was employed to deform composites’ specimens possessing different aspect ratios into an open
die. The induced strains on the outer surface of specimens were measured continuously through
two high speed, high resolution CCD cameras by employing a Digital Image Correlation (DIC) technique. The strain paths at three different locations on the surface of specimens were compared to elucidate the effect of fibre and matrix on the formability of a woven composite. The fractured surface of specimens was investigated to reveal the effect of fibre mechanical properties on failure morphologies in woven composites. It was found out that the main mode of failure in GRPP is fibre fracture while observed failure morphologies in SRPP were a complex combination of different
failure mechanisms. It was revealed that the combination of applied boundary conditions and
specimen’s width determines the effective forming mechanisms.
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Journal of Materials Science and Chemical Engineering