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

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Estimation of principal directions of Bi-axial residual stress using instrumented Knoop indentation testing

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Title
Estimation of principal directions of Bi-axial residual stress using instrumented Knoop indentation testing
Author
Kim, Young-CheonChoi, Min-JaeKwon, DongilKim, Ju-Young
Issue Date
2015-09
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v.21, no.5, pp.850 - 856
Abstract
We propose a novel method for estimating stress directionality p and principal direction theta(p) using four Knoop indentations. Indentation load-depth curves with a Knoop indenter are shifted with respect to indenter orientation to stress direction. Based on this phenomenon, we derived p and theta(p) theoretically in terms of the indentation load differences between a stressed and an unstressed sample. Plastic zone beneath the Knoop indenter was theoretically estimated based on expanding cavity model for confirming separate plastic zones of four Knoop indentations. The proposed models and algorithms were verified by indentation experiments under various applied stress states that are generated using a stress-generating jig with two independent orthogonal loading axes. Estimated principal directions showed good agreement with applied principal directions. For small target area when considering in-field application, we proposed an estimation method of one load difference with other three load differences, and it was verified as feasible method with experimental results.
URI
https://scholarworks.unist.ac.kr/handle/201301/16787
URL
http://link.springer.com/article/10.1007%2Fs12540-015-5176-1
DOI
10.1007/s12540-015-5176-1
ISSN
1598-9623
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