New method for assessing discontinuities of the surface layer based on the surface roughness measurements

Abstract

There are several methods for examining open porosity: Archimedes, image analysis, porosimetry and computed tomography. The research aimed to develop a new and quick method for determining discontinuities of the surface layer using surface texture measurements.Investigations were carried out in two stages. The first one, an areal roughness measurement standard, was used. The second one included testing metallic samples prepared by Selective Laser Sintering (SLS). The surface roughness of all samples was determined using the optical confocal profiling method. The Archimedes and image analysis (grid method) were used to analyse open porosity. Selected roughness parameters related to the volume and depth of the dales were calculated.A new method for testing discontinuities of the surface layer based on surface texture measurements was developed. The new method enables quick analysis of the surface layer of samples obtained by 3D sintering. It can be successfully used alone or as an additional source of information about the tested sample during roughness measurements. The obtained results regarding discontinuities of the surface layer are strongly related to the open porosity of the sample and consistent with those achieved using the Archimedes and image analysis selected as reference methods.The proposed method, presented in the article, concerns testing materials with relatively high porosity. Verifying the method using other materials or different manufacturing techniques will constitute a further research challenge.The main advantage of the proposed method is the shortening of the analysis time of samples. Results from a single device (profilometer) provide information on the surface roughness and discontinuities of the surface layer of the sample.The paper presents a new method for measuring discontinuities of the surface layer related to open porosity. The subject matter should interest researchers involved in the analysis of mechanical and functional properties and surface texture analysis.