Abstract
Nanoindentation is a non-destructive technique used for evaluating mechanical properties from a very small volume of material by deforming it with a indenter. In the present investigation, FE modelling has been carried out to study the influence of friction on Ti-6Al-4V alloy widely used for aerospace applications. The emphasis is placed on providing a comprehensive evaluation of the influence of friction coefficient on load Vs displacement characteristics, calculated hardness and young's modulus in conical and spherical indentations. The development of pile-up/sink-in during indentation process and its dependence on contact friction was also analyzed. Results indicates that, during indentation process, the amount of pile-up cannot be related solely to the strain-hardening exponent, rather, the contact friction also affects the pile-up geometry, Therefore, the material parameters which are related to projected area will lead to large error due to friction contradicting with the statement of researchers i the published literature i.e, the instrumented indentation experiments are not significantly affected by friction. The error in hardness and Young's modulus were found to be as high as 14.59% and 6.78% respectively.
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