Determining Representative Stress and Representative Strain in Deriving Indentation Flow Curves Based on Finite Element Analysis

Abstract:

A new method [1] to evaluate indentation flow curves using an instrumented indentation test has been applied to many materials for several years. Though the method produces relatively good results compared to uniaxial tensile tests, a few parameters had not been verified by theoretical or numerical methods. In this study, proportional constants of representative strain and representative stress were verified using finite element analysis and proven to be unaffected by the elastic property and strain level. The constants were generally dependent on the plastic property; however, one combination of the constants is independent of all properties. The values of this combination are consistent with early research and produced overlapping indentation flow curves with uniaxial curves.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 2152-2157
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.2152
• Online since: November 2005
• Authors: Eun Chae Jeon, Min Kyung Baik, Sung Hoon Kim, Baik Woo Lee, Dong Il Kwon
• Keywords: Finite Element Analysis (FEA), Indentation Flow Curve, Instrumented Indentation Test, Plastic Constraint Factor, Representative Strain, Representative Stress

References

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[2] ISO FDIS 14577: Metallic materials-Instrumented indentation test for hardness and materials parameters.

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[6] To be submitted to Mater. Sci. and Eng. A.

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