Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Property Evaluation Method Using Spherical Indentation for High-Yield Strength Materials

고강도 재료에 대한 구형압입 물성평가법

  • Received : 2014.10.22
  • Accepted : 2015.06.01
  • Published : 2015.11.01
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Abstract

In this paper, we propose a method to evaluate the material properties of high-yield strength materials exceeding 10GPa from spherical indentation. Using a regression equation considering four indentation variables, we map the load displacement relation into a stress-strain relation. To calculate the properties of high-strength materials, we then write a program that produces material properties using the loading / unloading data from the indentation test. The errors in material properties computed by the program are within 0.3, 0.8, and 6.4 for the elastic modulus, yield strength, and hardening coefficient, respectively.

본 연구에서는 항복강도 1GPa 이상의 고강도재료에 대해 구형압입자를 이용한 물성평가법을 제시한다. 압입전산모사를 통해 하중-변위 관계를 응력-변형률 관계로 변환하는 네 압입변수에 대한 회귀식을 바탕으로, 고강도 물성평가용 프로그램을 작성했다. 이를 압입시험에 적용하면 단 한번의 하중-해중에서 얻어지는 데이터로 유효 응력-변형률곡선을 얻을 수 있다. 광범위한 재료들에 대해 구해진 물성치의 평균오차는 영률 0.3%, 항복강도 0.8 %, 변형경화지수 6.4 % 이내이다.

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References

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