Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Analysis of Residual Stress through a Recovery Factor of Remnant Indents Formed on Artificially Stressed Metallic Glass Surfaces

응력상태의 비정질 표면에 형성된 압입흔적 회복인자를 이용한 잔류응력 분석

  • Lee, Yun-Hee (Division of Industrial Metrology, Korea Research Institute of Standards and Science) ;
  • Yu, Ha-Young (Division of Industrial Metrology, Korea Research Institute of Standards and Science) ;
  • Baek, Un-Bong (Division of Industrial Metrology, Korea Research Institute of Standards and Science) ;
  • Nahm, Seung-Hoon (Division of Industrial Metrology, Korea Research Institute of Standards and Science)
  • 이윤희 (한국표준과학연구원 산업측정표준본부 재료측정표준센터) ;
  • 유하영 (한국표준과학연구원 산업측정표준본부 재료측정표준센터) ;
  • 백운봉 (한국표준과학연구원 산업측정표준본부 재료측정표준센터) ;
  • 남승훈 (한국표준과학연구원 산업측정표준본부 재료측정표준센터)
  • Received : 2009.10.29
  • Published : 2010.03.20
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Abstract

An application of the instrumented indentation technique has been expanded from the measurements of hardness and elastic modulus to the analysis of residual stress. A slope of the indentation loading curve increases (or decreases) according to compressive (or tensile) residual stress. A theoretical equation has been established for quantifying residual stress from the slope change. However, a precise observation of the remnant indents is indispensible because the theoretical approach needs actual contact information. In addition, the conventional hardness test is still used for predicting the residual stress distribution of welded joints. Thus, we observed the three-dimensional morphologies of the remnant indents formed on artificial stress states and analyzed stress effects on morphological recovery of the indents. First, a depth recovery ratio, which has been regarded as a sensitive stress indicator, did not show a clear dependency with the residual stress. Thus an analysis on volumetric recovery was tried in this study and yielded a inverse proportional behavior with the residual stress. In addition, an elastic to plastic volume recovery ratio showed more significant correlation with the residual stress.

Keywords

Acknowledgement

Supported by : 과학기술부

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