Abstract
This article presents an analysis of fracture surface for steel S355J2 and EN AW-2017A-T4 aluminium subjected to fatigue bending, torsion, and bending with torsion. Fracture surfaces were observed using the focus variation microscope, which allows for the acquisition of data sets with large depth of focus. The authors focus on presenting the features of profile roughness parameters on the example of differences between fracture propagation and rupture areas. The researchers are looking for a correlation or ratio between different profile roughness parameters, especially arithmetical mean deviations of the roughness profile Ra and maximum height of the roughness profile Rz, for this case.
Highlights
Fracture topography [1] is one of the basic investigations aimed at determining the cause of the damage
There are more than a hundred parameters describing the surface topography that we divide into three groups, which are defined as amplitude parameters, spacing parameters, and hybrid parameters [5]
In order to distinguish the type of loading stress ratio r = τmax / was employed, amounting from 0 to 1
Summary
Fracture topography [1] is one of the basic investigations aimed at determining the cause of the damage. It allows determining what kind of the loading the material was subjected. Nowadays surface roughness parameters [2] are defined in a handful of international standards [3, 4]. There are more than a hundred parameters describing the surface topography that we divide into three groups, which are defined as amplitude parameters, spacing parameters, and hybrid parameters [5]. The two most popular surface roughness parameters are arithmetical mean deviation of the roughness profile Ra (1) and maximum height of the roughness profile Rz (2).
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