Depth sensing indentation (DSI) testing is generally considered as a simple method for the determination of the Young's modulus of materials [1-5]. Methods found in the literature for the calculation of Young's modulus from indentation tests are based in most cases on the theoretical solution of the Boussinesq problem given by Sneddon [6] who determined the load-indentation depth functions for various inden-ters in an elastic half space. The most frequently used method of Young's modulus determination was developed by Oliver and Pharr [3]. Using Sneddon's results, they elaborated an iterative procedure for the determination of the reduced Young's modulus, Er (E_r = (E/1 - v~2), where E is the Young's modulus and v is the Poisson's ratio). The uncertainty of both parameters is relatively high and the procedure is complicated.
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