We have studied dynamic friction phenomena using a variety of experimental measurement approaches. We have combined thermoelastic stress analysis (TSA) and optical microscopy to measure both the stress field and the interface slip displacement in a model frictional contact. We use a plane stress, fiber pullout-type geometry to produce a line contact interface. The interface operated in the partial slip regime with no gross sliding. The stress field and slip displacement information allow us to construct a friction constitutive relationship directly from experimental data. We also use complementary interface modeling to physically interpret the experimental observations. The results suggest that the interface slip zone size is a nominally linear function of pullout force, while the interface slip displacement responds as a second-order function of distance along the interface. When combined, these observations suggest a scaling law for per-cycle energy dissipation of the form EFo3, where Fo is the forcing amplitude. Experimental and modeling results are presented to support this conclusion.

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