Failure Analysis of Stress Reliever in Heat-Transport Pipe of District Heating SystemFailure Analysis of Stress Reliever in Heat-Transport Pipe of District Heating System
- Other Titles
- Failure Analysis of Stress Reliever in Heat-Transport Pipe of District Heating System
- Authors
- 이수열; 조정민; 채호병; 김희산; 김정구; 김우철
- Issue Date
- 2-Sep-2022
- Publisher
- 한국부식방식학회
- Keywords
- District heating; Heat-transport pipe; Stress reliever; Crack
- Citation
- CORROSION SCIENCE AND TECHNOLOGY, v.21, no.4, pp 243 - 249
- Pages
- 7
- Journal Title
- CORROSION SCIENCE AND TECHNOLOGY
- Volume
- 21
- Number
- 4
- Start Page
- 243
- End Page
- 249
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/30359
- DOI
- 10.14773/cst.2022.21.4.243
- ISSN
- 1598-6462
2288-6524
- Abstract
- The objective of the present study was to perform failure analysis of double-layered bellow (expansion joint), a core part of stress reliever, used to relieve axial stresses induced by thermal expansion of heattransport pipes in a district heating system. The bellow underwent tensile or compressive stresses due to its structure in terms of position. A leaked position sufferred a fatigue with a tensile component for decades. A cracked bellow contained a higher fraction of martensitic phase because of manufacturing and usage histories, which induced more brittleness on the component. Inclusions in the inner layer of the bellow acted as a site of stress concentration, from which cracks initiated and then propagated along the hoop direction from the inner surface of the inner layer under fatigue loading conditions. As the crack reached critical thickness, the crack propagatedto the outer surface at a higher rate, resulting in leakage of the stress reliever.
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