Finite volume method and multigrid acceleration in modelling of rapid crack propagation in full-scale pipe test |
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Authors: | A Ivankovic S Muzaferija I Demirdzic |
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Affiliation: | Mechanical Engineering Department, Imperial College, Exhibition Road, London SW7 2BX, UK, GB Institut für Schiffbau, Universit?t Hamburg, Lammersieth 90, D-22305 Hamburg, Germany, DE
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Abstract: | Rapid Crack Propagation (RCP) along pressurised plastic pipes is by far the most dangerous pipe failure mode. Despite the
economic benefits offered by increasing pipe size and operating pressure, both strategies increase the risk and the potential
consequences of RCP. It is therefore extremely important to account for RCP in establishing the safe operational conditions.
Combined experimental-numerical study is the only reliable approach of addressing the problem, and extensive research is undertaken
by various fracture groups (e.g. Southwest Research Institute – USA, Imperial College – UK).
This paper presents numerical results from finite volume modelling of full-scale test on medium density polyethylene gas pressurised
pipes. The crack speed and pressure profile are prescribed in the analysis. Both steady-state and transient RCPs are considered,
and the comparison between the two shown. The steady-state results are efficiently achieved employing a full multigrid acceleration
technique, where sets of progressively finer grids are used in V-cycles. Also, the effect of inelastic behaviour of polyethylene
on RCP results is demonstrated. |
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