THE USE OF AUTOMATED IMAGE-ANALYSIS FOR THE STUDY OF WEAR PARTICLES IN OIL-LUBRICATED TRIBOLOGICAL SYSTEMS

Automated image analysis is used to evaluate particle dimensions in ferrographic precipitated wear debris. The wear particles are made accessible to microscopic investigation by employing a particular sample preparation technique. Preliminary results from investigations of jet turbine and helicopter transmission lubricating oils show a significant change in particle size and shape as a function of advancing failure. The data are compared with results of laboratory wear test devices (Ryder test) as well as other condition monitoring methods (SOAP).