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Author

Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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Using the instrumented indentation technique for stress characterization of friction stir-welded API X80 steel

Cited 11 times inthomson ciCited 14 times inthomson ci
Title
Using the instrumented indentation technique for stress characterization of friction stir-welded API X80 steel
Author
Lee, YKim, Ju-YoungKim, J. -Y.Lee, J. -S.Kims, K-HKwon, D.
Keywords
RESIDUAL-STRESS; SHARP INDENTATION; NANOINDENTATION
Issue Date
200611
Publisher
TAYLOR & FRANCIS LTD
Citation
PHILOSOPHICAL MAGAZINE, v.86, no.33-35, pp.5497 - 5504
Abstract
An instrumented indentation technique (IIT) appears to be a promising alternative to conventional stress measurement methods, particularly for welds with rapid microstructural gradients, because it has high spatial resolution and is non-destructive. The technique is used to characterize the residual stress of a friction stir-welded joint of API X80 steel. The indentation load - depth curve is significantly affected by the presence of residual stress and the stress-induced load change at a given penetration is converted to a quantitative stress value through an analytical model. All indentation test results show good agreement with those from an energy-dispersive X-ray diffraction performed to assess the validity of the IIT. In addition, the microstructures in various regions of the friction stir-welded joint and their effects on local microhardness are discussed.
URI
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DOI
http://dx.doi.org/10.1080/14786430600776330
ISSN
1478-6435
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