나노 인덴테이션 시험에서의 탄소성 재료의 파일업/싱크인 특성

The piling-up/sinking-in response of elasto-plastic materials in nano-indentation using sharp indenter

  • 김병민 (부산대학교 기계공학부) ;
  • 이찬주 (부산대학교 정밀기계공학과 대학원) ;
  • 이정민 (부산대학교 정밀기계공학과 대학원) ;
  • 이상진 (부산대학교 정밀기계공학과 대학원)
  • 발행 : 2007.05.30

초록

Over the past decade, many computational researches have been performed to investigate quantitative relationships between load-displacement and material properties. But piling-up which causes errors to estimate mechanical material properties remains the most significant unresolved issue in nano-indentation test. This study has estimated quantitative aspects of the effects of material properties, especially work hardening exponent, on piling up/sinking in response of various materials. Using FE Analysis, piling up/sinking in response when material is indented by sharp indenter is investigated to evaluate the effects of material properties. From the FE analysis result, quantitative relationships between piling up/sinking in height and material properties is assessed using dimensional analysis which is used to define scaling variables and universal functions. And nano-indentaion test is performed to verify this relation on various materials. From the result of comparison with prediction from dimensional function and experiment, the work hardening exponent was found to have greater influence on the piling up/sinking in height during the nano-indentation than other material properties, such as elastic modulus and yield stress.

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