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http://dx.doi.org/10.3795/KSME-A.2015.39.1.011

Study on Tensile Fatigue Behavior of Thermal Butt Fusion in Safety Class III High-Density Polyethylene Buried Piping in Nuclear Power Plants  

Kim, Jong Sung (Dept. of Mechanical & Aerospace Engineering, Sunchon Nat'l Univ.)
Lee, Young Ju (Dept. of Mechanical & Aerospace Engineering, Sunchon Nat'l Univ.)
Oh, Young Jin (Power Electric Research Institute, KEPCO E& C)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.39, no.1, 2015 , pp. 11-17 More about this Journal
Abstract
High-density polyethylene (HDPE) piping, which has recently been applied to safety class III piping in nuclear power plants, can be butt-joined through the thermal fusion process, which heats two fused surfaces and then subject to axial pressure. The thermal fusion process generates bead shapes on the butt fusion. The stress concentrations caused by the bead shapes may reduce the fatigue lifetime. Thus, investigating the effect of the thermal butt fusion beads on fatigue behavior is necessary. This study examined the fatigue behavior of thermal butt fusion via a tensile fatigue test under stress-controlled conditions using finite element elastic stress analysis. Based on the results, the presence of thermal butt fusion beads was confirmed to reduce the fatigue lifetime in the low-cycle fatigue region while having a negligible effect in the medium- and high-cycle fatigue regions.
Keywords
HDPE Piping; Tensile Fatigue Behavior; Stress-Controlled Condition; Thermal Butt Fusion; Safety Class III Buried Piping; Nuclear Power Plant;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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