Research progress on reliability assessment methods of polyethylene pipes fusion joint

doi:10.19491/j.issn.1001-9278.2022.01.022

Abstract

Abstract:

This manuscript first introduces the main methods for reliability evaluation of polyethylene pipe butt?fused joints in terms of short?term mechanical performance and long?term slow crack growth resistance capability. In recent years， phased?array ultrasonic have been widely used in non?destructive testing of the reliability of welded joints. Its testing automation and intelligent qualification technologies have become a mainstream research direction. At present， there are few tests on the reliability of welded joints in Chinese standards. In order to make polyethylene pressure?bearing pipelines developed in the direction of thick?walled， large?diameter， high?pressure resistance， extreme temperature application， long service life， and more safe， the reliability assessment of welded joints is required. The complete testing methods and package including accelerated testing， use of smaller samples instead of pipeline samples are hoped to be established. Finally， expect to see the new technologies used to transfer the characters of material to fused joints to facilitate the development of pipes application together with materials innovation.

Key words: polyethylene, pipe, fusion joint, reliability assessment method, accelerated testing, non?destructive inspection, characters transferring

CLC Number:

TQ325.1⁺2

WANG Zhenchao, ZHANG Ying, PENG Yijuan, YU Xi, ZHANG Qiuju. Research progress on reliability assessment methods of polyethylene pipes fusion joint[J]. China Plastics, 2022, 36(1): 148-159.

Figures/Tables 16

Fig.1. Hot plate fusion joint process

Fig.2. X size created by different fusion force

Fig.3. Molecular chain at fusion joint point

Fig.4. Fusion joint photo and its SEM picture

Fig.5. Stress?strain chart of tensile test

Fig.6. Fracture types and photos

Fig.7. Impact test chart and fracture types

Fig.8. Bend test sampling and loading

Fig.9. Sample shape of tensile tests

Fig.10. Stress model inside pipe wall

Fig.11. CRB sample shape

Fig.12. CRB ductile and brittle fracture photos

Fig.13. CRB testing data double logarithmic diagram of ?σ versus Nf

Fig.14. Phased ultrasonic changed angle

Fig.15. Phased ultrasonic changed focal point

Fig.16. Different scan picture from testing

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