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나노압입시험에서 재료의 기계적 특성이 파일업/싱크인 형성에 미치는 영향
이정민(J. M. Lee),김병민(B. M. Kim),이정환(J. H. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
One of the primary features of nanoindentation is that many mechanical properties can be solely determined by just analyzing the indentation load - penetration depth data alone without the additional observations of the residual indentation impression. Thus, to extract the accurate mechanical properties from the indentation response, it is very important to measure exactly the true contact area between indenter and materials during indentation. This study is designed to investigate the effect of different E/σy and strain hardening exponents on the formation of pile-up/sink-in during indentation. Also, the relationship between the pile-up/sink-in and the mechanical properties of the indented materials were defined by dimensional analysis and numerically formulated using indentation FE simulations of 140 cases.