Abstract
Transient load/time behaviour of GRP filament wound pipes under single-bounce, low-velocity (up to 10 m/s) impact testing in two support conditions has been modelled using two simple single-degree-of-freedom mass-spring models. Model A regards the pipe as a mass impacting a massless, simply-supported spring and gives a good first approximation to general behaviour. This is improved, particularly for the end-cradled support condition, by the use of a non-linear force constant. Model B regards the system as a massive, simply-supported beam (or ring) subjected to a ramp load and is used primarily to predict the period of pipe oscillation, T n . Two versions of model B were employed, considering the pipe as a beam and a ring. The ring model was found to be the closest approximation to actual behaviour. This indicates that the behaviour of the pipe under impact is dominated by the ring mode of vibration.
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