Browse > Article

Effect of tack of Fusion Defects on Short-Term Performance of Polyethylene Electrofusion Joints  

Kil, Seong-Hee (Dept. of Gas Safety R D Center, Korea Gas Safety Corporation)
Kwon, Jeong-Rock (Dept. of Gas Safety R D Center, Korea Gas Safety Corporation)
Jo, Ji-Hwan (Dept. of Gas Safety R D Center, Korea Gas Safety Corporation)
Publication Information
Journal of Energy Engineering / v.14, no.2, 2005 , pp. 153-158 More about this Journal
Abstract
In order to investigate the short-term performance of polyethylene electrofusion joints, the mechanical tests and stress analysis have been conducted to the artificially defected weld joints. The defects of lack of fusion with a square-type were fabricated with 10, 20, 30, 40, 50, 60$\%$ size of the width of heat-ing wire zone, respectively. In this defect sires range, both tensile and bending test results showed the dependence of defect size to the electrofusion joints performance, but both sustained pressure and crush test results didn't. The numerical stress analysis results including the soil and internal pressures, tensile and bend-ing stresses clearly showed the dependence of fusion defect size. Based on both mechanical test and stress analysis results, the maximum acceptable defect size in polyethylene electrofusion joints is discussed.
Keywords
Polyethylene (PE); Electrofusion (EF); Lack of fusion; Flaw criteria;
Citations & Related Records
연도 인용수 순위
  • Reference
1 KS M 3514 95. 'Standard for Polyethylene Pipes for the Supply of Gaseous Fuels', Korean Standard, 1995
2 ASTM F1055 95a. 'Standard Specification for Electrofusion Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene Pipe and Tubing', ASTM International, 1995
3 ASTM D2513 95. 'Specification for Thermoplastic Gas Pressure Pipe, Tubing and Fittings', ASTM International, 1995
4 Wise, R.; Brown, C.; Chipperfield, F. 'Resistive Implant Welding', Chapter 7 Plastics and Composites Welding Handbook, D.A. Grewell, A. Benatar and J.B. Park, Editors, Hanser, 2003
5 Lustiger, A.; Cassady, M.J.; Uralil, F.S.; Hulbert, L.E. 'Field Failure Reference Catalog for Polyethylene Gas Piping', First Edition, Battelle Research Report, 1986
6 ASTM D638 95. 'Standard Test Method for Tensile Properties of Plastics', ASTM International. 1995
7 Kanninen, M.F.; Popelar, C.H. Advanced Fracture Mechanics, Chapter 7, Oxford University Press, 1985
8 ASTM D1599 88. 'Standard Test Method for Short-Time Hydraulic Failure Pressure of Plastic Pipe, Tubing and Fittings', ASTM International, 1988
9 Korean Civil Gas Safety Management Regulations for Pipe Thickness, 2000, Chapter 2-11