S. Haanappel, R.H.W. ten Thije, U. Sachs, A. Rietman, R. Akkerman, G. Menary
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In-Plane Shear Characterisation of Uni-Directionally Reinforced Thermoplastic Melts
Intra-ply shear is an important mechanism in hot stamp forming processes of UD fibre reinforced thermoplastic laminates. Various methods have been developed to characterise this shear mechanism, but measured properties may differ for several orders of magnitude. Therefore, an alternative method to characterise the longitudinal shearing viscosity is presented. Straight fibre reinforced thermoplastic bars with a rectangular cross section are subjected to torsional loadings. The specimens' response can be used to characterise the shear properties of the fibre reinforced polymer melt. Different geometries and clamping conditions were modelled to show the sensitivity of the measured viscosity. Based on this, experiments were performed with thick bars with a PEI-AS4 and PEEK-AS4 composition. Frequency sweeps were applied at different temperatures. All measurements showed a clear shear thinning behaviour, which can conveniently be described with a power law model.
期刊介绍：
The Economic and Political Weekly, published from Mumbai, is an Indian institution which enjoys a global reputation for excellence in independent scholarship and critical inquiry. First published in 1949 as the Economic Weekly and since 1966 as the Economic and Political Weekly, EPW, as the journal is popularly known, occupies a special place in the intellectual history of independent India. For more than five decades EPW has remained a unique forum that week after week has brought together academics, researchers, policy makers, independent thinkers, members of non-governmental organisations and political activists for debates straddling economics, politics, sociology, culture, the environment and numerous other disciplines.
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