Abstract
Indentation morphologies depend on the mechanical properties of materials, especially the strain-hardening exponent and yield strength-to-elastic modulus ratio. Hernot et al.¹ described a model that can be used to obtain the indentation morphology index from properties determined in tensile tests. The model is used here with two aluminum alloys and 1020 steel tested under spherical indentation with different loads and ball diameters. There was good agreement between the values predicted by the model and the experimental findings for all the materials tested except partially recovered AA1350 aluminum alloy (H24 condition). This exception is discussed and a possible explanation for it is sought in other experimental deviations and in microstructural inhomogeneities.
Highlights
Indentation morphologies depend on the mechanical properties of materials, especially the strain-hardening exponent (n) and yield strength-to-elastic modulus ratio (Y/E)
After exhaustive use over many years of the results reported by Norbury and Samuel[8], new experimental results relating strain-hardening exponent and indentation morphologies in spherical indentation were published[7]
In the case of AA1350 aluminum alloy, it is worthwhile to note that its Y/E is close to this limit
Summary
Indentation morphologies (pile-up/sink-in) depend on the mechanical properties of materials, especially the strain-hardening exponent (n) and yield strength-to-elastic modulus ratio (Y/E). Pintaude et al.[7] observed that the behavior of two metals (316 L stainless steel and AA1350-H24 aluminum alloy) in deep spherical indentation tests was not described by any model[9,10,11,12] and discussed this finding in the light of the metallurgical properties of these materials In this context, this manuscript aims to compare the indentation morphologies for different metals calculated using models described by Hernot et al.[1] and Cheng and Cheng[13] and to show how they explain the findings in the study by Pintaude et al.[7]. In the case of the paper by Hernot et al.[1], a series of equations were derived, as the amount of pile-up or sink-in depends on the ratio of the maximum indentation depth to ball radius (h/R) and on the mechanical properties (n and Y/E) extracted from tensile
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