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Vol.41, No.11, 737 ~ 743, 2003
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| Title |
| Analysis of Non-equi-biaxial Surface Residual Stress through the Modeling of Shape Shifting in Instrumented Indentation Curve |
| 이윤희 Lee Yun Hui , 정증현 Jeong Jeung Hyeon , 박주승 Park Ju Seung , 권동일 Kwon Dong Il |
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| Abstract |
| Non-destructive instrumented indentation is proposed as a promising alternative of the conventional stress-measuring methods based on already-reported its sensitivity to applied stresses. In this study, we tried to expand the current indentation model on equi-biaxial stress to the characterization of general surface stress in nonequi-biaxial state. A contribution of the surface stress on indentation plasticity was theoretically extracted from the non-equi-biaxial stress matrix. And, a newly derived stress equation was expressed as a multiple of stress non-equibiaxiality and residual-stress-induced normal load. An experimental tests for confirming the model were also conducted on artificially strained API X65 steel plate, and produced the non-equi-biaxiality factor consistent with that from theoretical analysis. |
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| Key Words |
| Residual stress, Instrumented indentation, Curve shifting, Stress-proportional factor, Stress-directionality coefficient |
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