Abstract
We present a new dynamic friction coefficient testing device modified from the conventional split Hopkinson pressure bar (SHPB). In the experiment, the normal pressure and friction force are applied to the tribo pair simultaneously via the wedge structure of the incident bar. The geometry of tribo pairs can be cylindrical or cuboid which can be as simple as the samples in SHPB experiments, and the time-resolved interfacial friction coefficient can be directly calculated without any assumptions or theoretical derivation. The interfacial friction between two plastics and aluminum was tested by the novel setup, the normal pressure and friction force histories were measured, and the time-resolved dynamic friction coefficient was obtained.
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