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FM: Exploring flash heating coupled with mm-scale contact evolution in granite

Monica Barbery, Brown University

Flash-weakening models show good agreement with the total magnitude of weakening observed in high-velocity rock friction experiments, however deviations from model predictions during the acceleration and deceleration phases remain unresolved. Here, I present recent work on Westerly granite using a high-speed biaxial apparatus outfitted with a high-speed infrared camera. We use unique sliding surface geometries to control mm-scale life-times and rest-times and to inform 1-D thermal models. We compare model predictions with measured surface temperatures to constrain the evolution of local normal stress at the mm-scale and incorporate this evolution into a flash heating model that considers weakening at both the µm- and mm-scale.

Mar 17, 2023 01:00 PM in Pacific Time (US and Canada)