The driven notch at the corrosion boundary in renovated pipe lining system was considered to constitute a more sever condition than any accidentally induced flaws, and the embrittle effect of 3-dimensional (3-D) stressing due to notched behaviour have therefore been studied by focusing on this situation. Experimental work was first undertaken to obtain the performance of Medium Density of Polyethylene (MDPE) under driven notch condition. Then finite element (FE) models using elasto-plastic and elasto-viscoplasticity were developed to simulate the behaviour. The localised strain hardening underneath the driven knife was also considered. Simulations of the penetration through MDPE show reasonably good correlation to that experienced in the test.

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