The Nanoindentation is a precise technique for the elucidation of mechanical properties. But such elucidation requires physically based interpretation of the loading curves that is widely still not practiced. The use ...The Nanoindentation is a precise technique for the elucidation of mechanical properties. But such elucidation requires physically based interpretation of the loading curves that is widely still not practiced. The use of indentation hardness <em>H</em> and indentation modulus <em>E<sub>r</sub></em> is unphysical and cannot detect the most important phase-transitions under load that very often occur. The claim that <em>H </em>versus<em> E </em>plots relate linearly for all different materials is neither empirically found nor correctly deduced. It is most dangerous by producing incorrect materials properties and misleading. The use of <em>H/E</em> (that is also called “elasticity index”) in complicated formulas for brittle parameter, yield strength, toughness, and so-called “true hardness” is also in error. The use of<em> H/E </em>cannot reveal the true qualities of materials without considering phase-transitions under load that require the correct exponent 3/2 on <em>h</em> for the loading curves (instead of disproved 2). This is exemplified with the physical data of different mollusk shells that experience phase-transitions, a new bionics model, and different contributions for their strengthening. The data are compared to the ones of aragonite and calcite and vaterite.展开更多
文摘The Nanoindentation is a precise technique for the elucidation of mechanical properties. But such elucidation requires physically based interpretation of the loading curves that is widely still not practiced. The use of indentation hardness <em>H</em> and indentation modulus <em>E<sub>r</sub></em> is unphysical and cannot detect the most important phase-transitions under load that very often occur. The claim that <em>H </em>versus<em> E </em>plots relate linearly for all different materials is neither empirically found nor correctly deduced. It is most dangerous by producing incorrect materials properties and misleading. The use of <em>H/E</em> (that is also called “elasticity index”) in complicated formulas for brittle parameter, yield strength, toughness, and so-called “true hardness” is also in error. The use of<em> H/E </em>cannot reveal the true qualities of materials without considering phase-transitions under load that require the correct exponent 3/2 on <em>h</em> for the loading curves (instead of disproved 2). This is exemplified with the physical data of different mollusk shells that experience phase-transitions, a new bionics model, and different contributions for their strengthening. The data are compared to the ones of aragonite and calcite and vaterite.
