Diekweg 15, D-26188 Edewecht
Germany
Research Article
Dilemma between Physics and ISO Elastic Indentation Modulus
Author(s): Gerd KauppGerd Kaupp
This paper challenges the ISO standard 14577 that determines the elastic indentation modulus by violating the first energy law, violating the physically deduced dimensional law, and omitting easily detected phase change onsets as well as initial surface effects under load. The double iteration for incorrect fitting indentation modulus to Hook's law Young's modulus of a standard with up to 11 free parameters must be cancelled and discontinued. The iterative evaluation of the elastic modulus Er-ISO can by far not be reproduced by iteration-free direct calculation of Er, when using the underlying formulas for S, hc, Ahc, and ε. For cubic aluminium the divergence amounts to a factor of 3.5 or 3.1, respectively (both smaller for the non-iterated calculations). Every interpretation of indentation moduli as single unid.. Read More»
DOI:
10.4172/2169-0022.1000402
Journal of Material Sciences & Engineering received 3677 citations as per Google Scholar report