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Experimental and Analytical Study on the Burst Pressure of Steam Generator Tubes with T-type Combination Cracks  

Shin, Kyu-In (Frontier Technology Innovation Center, Chung Ang University)
Park, Jai-Hak (Department of Safety Engineering, Chungbuk National University)
Yoon, Kee-Bong (Department of Mechanical Engineering, Chung Ang University)
Publication Information
Journal of the Korean Society of Safety / v.20, no.2, 2005 , pp. 38-43 More about this Journal
Abstract
Several nuclear power plants reported that they often found the combination cracks, which consist of longitudinal and circumferential cracks in the tubes. For the burst pressure of a tube with a single longitudinal or circumferential crack several experimental equations have been proposed in published literatures. But for the combination crack appropriate fracture criterion has not been proposed yet. In this study the burst pressures of a tube with a longitudinal crack or a T-type combination crack consisting of longitudinal and circumferential cracks were obtained experimentally and analytically. Fracture parameters such as crack opening angle (COA) were investigated by using elastic plastic analysis. Also the burst pressure far a T-type combination crack located near a tubesheet was considered to develop a length-based criterion. Because most of the axial, circumferential or combination cracks initiate in roll transition zone near the tubesheet.
Keywords
combination crack; longitudinal crack; circumferential crack; burst pressure; crack opening angle(COA); elastic plastic analysis;
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