A fractographic study exploring the fracture surface topography of S355J2 steel after pseudo-random bending-torsion fatigue tests

This paper presents the influence of multiaxial loading and fatigue behavior on a fracture surface in the context of its topography. For analysis were taken fracture surfaces obtained in experimental tests of S355J2 steel subjected to non-proportional bending with torsion. A high-resolution optical 3D profilometer was used in the examination and surface measurements. For a quantitative description of fracture mean surface roughness parameter Sa and a fractal dimension Df were employed. Surface topography studies were carried out on the entire fracture surface. Shear stress contribution expressed through ratio of maximum stresses lambda, loading conditions represented by variance of normal and shear stress mu, and fatigue life influence on the fracture surface parameters were found. Such a method of applying advanced way of topography application is useful not only as a measurement methodology but also, as innovation method of surface evaluation.

Automated summary

This paper investigates the influence of multiaxial loading and fatigue behavior on a fracture surface, using a high-resolution 3D profilometer for surface measurement and analysis. The quantitative description of surface roughness of the fracture surface was done through Sa and Df parameters. Shear stress contribution, loading conditions, and fatigue life were found to have an impact on fracture surface parameters. Advanced topography application method was found to be useful as both a measurement methodology and an innovative method for surface evaluation.