대한기계학회:학술대회논문집 (Proceedings of the KSME Conference)
- 대한기계학회 2003년도 추계학술대회
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- Pages.616-621
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- 2003
A SIMPLIFIED METHOD TO PREDICT FRETTING-WEAR DAMAGE IN DOUBLE $90^{\circ}$ U-BEND TUBES
- Choi, Seog-Nam (Mechanical Engineering System Department, Korea Power Engineering Company, Inc.) ;
- Yoon, Ki-Seok (Mechanical Engineering System Department, Korea Power Engineering Company, Inc.) ;
- Choi, Taek-Sang (Mechanical Engineering System Department, Korea Power Engineering Company, Inc.)
- 발행 : 2003.11.05
초록
Fluid-elastic instability is believed to be a cause of the large-amplitude vibration and resulting rapid wear of heat exchanger tubes when the flow velocity exceeds a critical value. For sub-critical flow velocities, the random turbulence excitation is the main mechanism to be considered in predicting the long-term wear of steam generator tubes. Since flow-induced interactions of the tubes with tube supports in the sub-critical flow velocity can cause a localized tube wear, tube movement in the clearance between the tube and tube support as well as the normal contact force on the tubes by fluid should be maintained as low as possible. A simplified method is used for predicting fretting-wear damage of the double