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http://dx.doi.org/10.7779/JKSNT.2013.33.2.165

A Study on Utilizing Instrumented Indentation Technique for Evaluating In-field Integrity of Nuclear Structures  

Song, Won-Seok (Department of Materials & Science and Engineering, Seoul National University)
Kim, Seung-Gyu (Department of Materials & Science and Engineering, Seoul National University)
Ahn, Hee-Jun (Department of Materials & Science and Engineering, Seoul National University)
Kim, Kwang-Ho (Frontics Inc.)
Kwon, Dongil (Department of Materials & Science and Engineering, Seoul National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.33, no.2, 2013 , pp. 165-172 More about this Journal
Abstract
Power generating unit structures are designed and built to meet standard to secure its safety for expected life time. As the structures have been exposed to combined environment, degradation of structure material is accelerated and it can cause unexpected damage; evaluating precise mechanical properties of weak site like welded area is an essential research area as it is directly connected to safety issues. Existing measuring technique like tensile test requires specific size in testing specimen yet it is destructive method which is hard to apply on running structures. To overcome above mentioned limitation, IIT is getting limelight as it is non-destructive and simple method. In this study, latest technique is introduced to evaluate tensile property and residual stress by analyzing stress field occurs under the indenter while IIT is performed. Test on welded area, the weak site of nuclear structures have been practiced and confirmed that IIT can be usefully applied to evaluate integrity in industry.
Keywords
Instrumented Indentation Technique; Tensile Property; Residual Stress; Integrity Assessment; Weldments;
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