Comparative assessment of entire bending-torsion fracture surface for 10HNAP steel using different optical measurement techniques

This research aimed to compare two microscopic measurement techniques -confocal and focus variation -for the assessment of the entire fracture surface method.The measurements were conducted using Sensofar S Neox 3D and Alicona InfiniteFocus G4 optical profilometers.Surface parameters were assessed for the entire fracture regions of the 10HNAP structural steel ring V-notched specimen.Fatigue test were performed under combination of bending and torsional moments.Stationary and ergodic random loadings had normal probability distribution and wide-band frequency spectra from 0 to 60 Hz.The obtained results for arithmetic mean height (Sa) and root mean square height (Sq) parameters did not show a comprehensible difference between the applied measurement techniques for the analysed specimen.Additionally, the process of filling in non-measured (NM) points does not significantly affect the results when compared to the raw data.Thus, both measurement devices and measurement techniques can be employed to the entire fracture method.