Hardness Test

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Relationship between hardness and the flow curve • Tabor suggested a method by which the plastic region of the true stress-strain curve may be determined from indentation hardness measurement. • This is under a condition such that the true strain was proportional to the d/D ratio (εεεε = 0.2d/D). σ o VHN = 3 ( 0. 1) Where σσσσ o is the 0.2% offset yield strength, kgf.mm-2 (=9.81 MPa) VHN is the Vickers hardness number n is the work hardening exponent. n Eq.8 Comparison of flow curve determined from hardness measurements Suranaree University of Technology May-Aug 2007 Tapany Udomphol
Relationship between hardness and the flow curve • For Brinell hardness, a very useful correlation has been used for heat-treated plain-carbon and medium-alloy steels as follows: UTS ( MPa) = 3. 4( BHN) Eq.9 • Furthermore, Young’s modulus can also be given from the nano-hardness test. Load displacement curve obtained from hardness test Suranaree University of Technology May-Aug 2007 Tapany Udomphol
Page 1 and 2: Hardness Test Subjects of interest
Page 3 and 4: Introduction Definition Hardness is
Page 5 and 6: Introductions • Hardness tests ca
Page 7 and 8: Advantages and disadvantages of Bri
Page 9 and 10: Meyer hardness • Meyer suggested
Page 11 and 12: Vickers hardness • Vickers hardne
Page 13 and 14: Vickers hardness values of material
Page 15 and 16: Rockwell hardness test Principal of
Page 17 and 18: Rockwell hardness instruction • C
Page 19: Plastic zone underneath an indenter
Page 23 and 24: Hardness at elevated temperatures
Page 25: References • Dieter, G.E., Mechan

Hardness Test

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