Comparison of fatigue performance of polyethylene pipe grades in the form of extruded and compression molded specimens

Due to the very long operational lifetimes (up 100 years) of polyethylene pipes, there is a strong demand for accelerated testing pipe materials experimentally prove ability certain material achieve such lifetime. Among tests performance, cracked round bar (CRB) test most convenient. The CRB takes advantage cyclic loading that applied on cylindrical specimens with circumferential notch in middle. are usually manufactured from plates produced by compression molding investigated material. However, producers, possibility making extrusion would save time and lower costs. This study dealing comparison test, new carried out notched samples extrusion. goal investigate measuring performance directly extruded specimens. illustrated experimental results several grades PE80, PE100 PE100RC often used manufacture.