Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
615561 | Tribology International | 2012 | 8 Pages |
When nanoindentation is used for material characterization in small indentation depths, surface roughness and frictional effects can play an important role. In the present computational study the implications of a slip rate dependent frictional behavior in the tip-flat/rough sample contact are investigated. A potential contribution of stick–slip phenomenon generated/enhanced by the adopted velocity-weakening friction approximation to pop-in like displacement bursts is observed. Undoubtedly discrete plastic events are the dominant source of pop-ins in a general setting, however the investigated frictional effect is shown to give a potential contribution to experimentally observed nanoindentation displacement bursts in the studied setup.
► Computational study of slip rate dependent frictional behavior in nanoindentation. ► Velocity-weakening frictional behavior can induce pop-ins. ► Parametric study of friction parameters and surface roughness. ► Potential frictional contribution to pop-ins in similar indentation scenarios.