Journal of Material Sciences & Engineering

Gerd Kaupp

Publications

• 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

  Abstract PDF