| Title |
Analysis of Non-equi-biaxial Surface Residual Stress through the Modeling of Shape Shifting in Instrumented Indentation Curve |
| Authors |
이윤희(Lee Yun Hui); 정증현(Jeong Jeung Hyeon); 박주승(Park Ju Seung); 권동일(Kwon Dong Il) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Residual stress; Instrumented indentation; Curve shifting; Stress-proportional factor; Stress-directionality coefficient |
| 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. |