Verifizierung numerischer Verfahren zur Modellierung abrasiver Verschleißprozesse durch Berechnung von Scratchtests

Abstract

Abrasion is a fundamental wear mechanism. It occurs whenever surfaces are loaded tribologically by hard particles or roughness peaks. The scratch test shows the behavior of a surface during abrasive stress. For that purpose a diamond tip (indenter) moves onto the material with either constant or progressive normal force. At first the material will be deformed elastically; with increasing force plastic deformation occurs till crack-and chip-forming, depending on the ductility of the material. Using elastic and plastic indentation depth, friction, acoustic emission through cracks and the three-dimensional analysis of the scratch, wear resistance to scratch-stress can be characterized.The simulation of scratch tests is useful to verify material models comparing the relative easily and quickly accomplishable tests with the simulation results. Based on this verification new or existing material approaches can be adapted even better to applications.The article describes problems and solutions during implementation of the simulation of the scratch test for the steel C45 (normalized). The comparison with experimental results shows that this approach is successful. In the future a closed material model for this type of stress will be developed.