Roughness measurement problems in tribological testing

In tribological measurement of thermoplastics against steel the surface roughness has a potential effect in dictating the frictional behavior of the material. In most cases the roughness of the specimen is measured before and after the test, where it affects the friction force and influences the mechanism involved. The roughness of the material is not the exact value and it has a deviance which depends upon the machining process used in preparing the surface. Generally, the direction of machining has an influence on the topography of the surface in case of turning, milling and drilling but in case of pressed components the direction has no effects. In order to maintain ideal test condition the surface roughness of the test materials has to be consistent for the given number of samples. Even though the test specimens are machined in the same machine with same parameters there are number of parameters involved in deciding the consistency of the surface roughness. The roughness of the surface are defined by number of parameters such as Ra, Rz and few 3D parameters in such a case narrowing down to a specific constant is vital. The results from the roughness is not made from one measurement were an average and deviance from several measurement decides that if two ideal samples has same or different roughness.

ISBN:9789490726010

Jaar van publicatie:2011

Toegankelijkheid:Open