Experimental Investigation on Mechanical Properties of Plastic Pipes Reinforced by Cross Helically Steel Wires

A plastic pipe reinforced by cross helically wound steel wires (PSP) is a new plastic-matrix steel composite pipe with excellent performance. Its strains, critical buckling pressure, short-time burst pressure and failure modes at various temperatures were investigated. Results show that its ring stiffness is increased by 19%, critical buckling pressure by 57% and short-time burst pressure at room temperature by 129% in comparison with a comparable polyethylene pipe; it has two failure modes, ductile burst and excessive deformation, and their transition temperature is about 45°C; radial expansion rate of the PSP due to internal pressure only exerting in the radial direction is much larger than that of enclosed PSP.