China Plastics ›› 2025, Vol. 39 ›› Issue (7): 49-55.DOI: 10.19491/j.issn.1001-9278.2025.07.009

• Processing and Application • Previous Articles     Next Articles

Study on fatigue failure resistance of polyethylene pipe materials evaluated by cyclic loading method

HU Yanlei(), SUN Jin, HU Fa, WU Zhijun, LI Yue, WU Xiaohan   

  1. Sinopec (Beijing) Chemical Research Institute Co,Ltd,Beijing 100013,China
  • Received:2024-12-23 Online:2025-07-26 Published:2025-07-22

Abstract:

This study evaluated the fatigue resistance of polyethylene (PE) pipe materials using cracked round bar cyclic loading tests. A systematic investigation was conducted to assess the effects of manufacturing method (compression molding vs. extrusion), specimen geometry, loading parameters (stress range, frequency, load ratio), and temperature on fatigue performance. Results indicated that compression⁃molded specimens exhibited superior fatigue resistance compared to extruded pipes. Fatigue life was significantly influenced by test conditions: (1) increasing specimen diameter reduced fracture cycles, (2) higher stress ranges reduced fatigue life, with a brittle⁃ductile transition occurring at 16 MPa, (3) elevated frequencies accelerated failure, (4) increased load ratios improved fatigue resistance, and (5) higher temperatures reduced cycle counts. These findings provide critical insights for optimizing PE pipe design and performance under cyclic loading conditions.

Key words: polyethylene pipe materials, fatigue, slow crack growth, cyclic loading cracked round bar

CLC Number: