Estimation of wall thinning defect size and location in pipes by Laser Speckle Interferometry
Piping in the Nuclear Power plants (NPP) are mostly consisted of carbon steel pipe. The wall thinning defect is mainly occurred by the affect of the flow accelerated corrosion (FAC) of fluid which flows in carbon steel pipes. This type of defect becomes the cause of damage or destruction of piping. Therefore, it is very important to measure defect which is existed not only on the welding part but also on the whole field of pipe. Over the years, Laser Speckle Interferometry (LSI) has been used as non destructive testing methods of the various kinds of materials. This technique has many merits and used for various industrial fields. In this paper, the quantitative analysis results of the location and the size of wall thinning defect that is artificially processed inside the carbon steel pipe by using LSI are obtained. The result obtained from no defect specimen and a series of the specimens with defect (according to the radial width and the axial length of defect) are compared with the strain distribution differences. This result can be used in defect size estimation of the carbon steel pipe. Experimental results for carbon steel pipes with artificial wall thinning defect show good agreement with actual values.
Wall thinning defect Quantitative analysis Strain distribution Shearography
Koung-suk KIM Su-ok JANG Jong-hyun PARK Sung-won NA Dong-su KIM Hyun-chul JUNG
Dept. of Mechanical Design Engineering, Chosun University Graduate School, Chosun University 375 Seosuk-dong, Dong-Gu, Gwangju, 501-759, Korea
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
3853-3859
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）