Um novo método para avaliar os coeficientes de rugosidade e áreas de vale de superfícies adquiridas por scanner a laser

Abstract

Quality evaluation of a material’s surface is performed through roughness analysis of surface samples. Several techniques have been presented to achieve this goal, including geometrical analysis and surface roughness analysis. Geometric analysis allows a visual and subjective assessment of roughness (a qualitative assessment), whereas computation of the roughness parameters is a quantitative assessment and allows a standardized analysis of the surfaces. This work proposes a new method to evaluate surface roughness, starting from the generation of a visual surface roughness signature, which is calculated through the roughness parameters computed in hierarchically organized regions. New parameters for analysis of favoring adherence by contact are also proposed, the valley area rate and average valley area. The proposed method is compared with the conventional (2D) roughness determination method to demonstrate the advantage of this new method, which presents results with higher resolution and accuracy. The evaluation tools presented in this new method provide a local and more accurate evaluation of the computed coefficients, which benefit the evaluation and comparison of the sampled surfaces when compared to other roughness determination methods. The results presented using the new parameters demonstrate that the method is effective for analyzing the extent of adhesion by contact area.