2003 Volume 53 Issue 4 Pages 163-168
In this paper, the effects of topography with different rough surfaces on glossiness are investigated experimentally in order to characterize a surface texture of an aluminum alloy A5052–H34. The surface texture of aluminum alloy is determined by the glossiness and the three factors of surface roughness: arithmetical mean Ra, period of roughness profile and slopes of the roughness. The surface of sample used in the experiment has different rough surfaces due to different cutting process. The topography of sample was measured by using a mechanical stylus profilometry. The periodic of roughness was evaluated by mean width of the profile elements RSm. The experimental results showed that the glossiness slightly increased as Ra decreased. As glossiness increased, RSm decreased. These means that the surface with low amplitudes and short wavelengths of the roughness results in high glossiness values. Moreover, histogram of the reflection angle calculated roughness profile showed that the specular reflection values of glossiness decreased as the diffuse reflection values increased. Thus the local slopes of the roughness correlate strongly with the glossiness. These results clearly verified that the proposed method for evaluating the surface texture of aluminum alloy was effective.
