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미소 시험편 기술의 응용을 통한 소재의 기계적 물성 평가
이윤희(Y.-H. Lee),안정훈(J.-H. Ahn),최열(Y. Choi),주장복(J.-B. Ju),권동일(D. Kwon) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
The evaluation of mechanical properties is necessary for maintaining the reliability of structural components. However, the applications of conventional mechanical tests have some problems such as complex preparation of macro-sized standard specimen and time consuming test procedures. Therefore, a simple, nearly nondestructive mechanical test using small specimen is needed. Local indentation and small punch, which use small specimen, satisfied these needs. Recently, nanoindentation test, which obtains indentation load-depth curve from the load and indenter displacement during indentation, is developed. The mechanical properties including yield strength, work-hardening index of soft film are predicted by the analysis of indentation load-depth curve and stress field under the indenter. And, the mechanical strength and microphase identification are characterized using the nanoindentation technique combined with atomic force microscope. The effect of residual stress to mechanical indentation is also verified using a novel stress-generating gadget. The fracture toughness of structural steel was evaluated using a revised small punch test. The revised technique is based on the fracture mechanics by adopting a sharp notch in the center of plate specimen. The fracture toughness in lower shelf brittle region is consistent with the conventional results.