Statistical methods for the analysis of the characteristic curve of brass by vickers indentation
Keywords:nanoindentation, characteristic curve, contact stiffness, contact depth, modeling, statistical tools.
Tocharacterize the mechanical properties of brass, tests by nanoindentation were conducted. The elastic modulus, E, and the hardness, H, are two most important parameters for the evaluation of mechanical properties of materials. Both the modulus and indentation hardness are highly dependent on the stiffness of contact, the contact area and the precision with which they are attached. From experimentalresults, we notice that the slope expressing the rigidity of contact on the contact depth is constant for a row of loading from 58.35mN until 3009.85mN, with the exception of some irregularities. Thereafter, we modeled the mechanical behavior of this slope by the use of linear regression by least squares method. In the final part of this article, a review of confrontation between the estimated slope and the two key parameters; the indentation modulus and hardness of conventional, was held to identify the factors explaining the trend characteristic points by Vickers nanoindentation test, using statistical tools.