Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)
- Volume 22 Issue 1
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- Pages.238-246
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- 1998
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- 1226-4873(pISSN)
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- 2288-5226(eISSN)
DOI QR Code
Geometric variations and surface residual stresses in U-bending processes of an UNS N06690 row-1 heat exchanger tubes
UNS N06690 제1열 시제전열관의 U-굽힘성형에서 형상변화와 표면잔류응력
- Kim, Woo-Gon (Korea Atomic Energy Research Institute) ;
- Jang, Jin-Sung (Korea Atomic Energy Research Institute) ;
- Kuk, Il-Hiun (Korea Atomic Energy Research Institute) ;
- Joo, Jin-Won (Dept. of Mechanical Engineering, Chungbuk National University) ;
- Kim, Sung-Chung (Dept. of Mechanical Engineering, Chungbuk National University)
- 김우곤 (한국원자력 연구소 원자력신소재개발) ;
- 장진성 (한국원자력 연구소 원자력신소재개발) ;
- 국일현 (한국원자력 연구소 원자력신소재개발) ;
- 주진원 (충북대학교 기계공학과) ;
- 김성청 (충북대학교 기계공학과)
- Published : 1998.01.01
Abstract
Surface residual stresses as well as wall thickness and ovality changes after U-bending process on UNS N06690 row-1 heat exchanger tubes, were estimated. Surface residual stresses were measured by Hole Drilling Method(HDM), calculating the stresses from relieved strains of 3 rosette strain gages. After bending of the tubes, dimensional tolerances for wall thickness and ovality were satisfied with ASTM requirements. Residual stresses at the extrados were introduced with compressive stress(-) by bending operations, and its maximum value reached-319 MPa in axial direction at
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