A study on the optimization of residual stress distribution in the polyethylene and polyketone double layer pipes

Abstract

Pipes are generally used in the variety of industries such as water purification, automobiles and air ventilation and so on which is commonly made from various materials like stainless steel, plastic and iron. Recently, plastic and copper pipes were widely used in the water industries due to their higher corrosive resistivity and durability. However, the mechanical defects are the major problem in the usage of the plastic pipes. The plastic pipe wall thickness and stress distribution are key components for the plastic deformation in the pipe. Among them, the residual hoop stress is the mainly affects the life time of the pipe. The present study investigates the effect of the inner and outer wall thickness on the pipe defects is explored by finite element analysis. As a result of observation, a discontinuity of stress is observed at the PK/PE interface of the double-multiple pipe due to the void value, and it is judged that the PK pipe has superior tensile strength due to its high mechanical strength and excellent physical properties such as yield stress and stiffness compared to PE pipe. It is judged that the conditions in the real environment can be analyzed by verifying the peeling phenomenon due to thermal fatigue due to different coefficients of thermal expansion between the heterogeneous resins and observing the peeling phenomenon due to local stress concentration due to the thickness non-uniformity of the bonding interface of the heterogeneous resins. The simulation and experimental results confirmed PK pipe has superior tensile strength due to its high mechanical strength and excellent physical properties such as yield stress and stiffness compared to PE pipe.Capsule: This work investigates the residual stress distribution in the polyethylene and polyketone double layer pipe.

Keywords

• Finite element analysis
• Stress contour
• Wall thickness
• Deformation
• Displacement