Microscopic defect dynamics during a brittle-to-ductile transition.

ABSTRACT: Deformation of all materials necessitates the collective propagation of various microscopic defects. On Earth, fracturing gives way to crystal-plastic deformation with increasing depth resulting in a "brittle-to-ductile" transition (BDT) region that is key for estimating the integrated strength of tectonic plates, constraining the earthquake cycle, and utilizing deep geothermal resources. Here, we show that the crossing of a BDT in marble during deformation experiments in the laboratory is accompanied by systematic increase in the frequency of acoustic emissions suggesting a profound change in the mean size and propagation velocity of the active defects. We further identify dominant classes of emitted waveforms using unsupervised learning methods and show that their relative activity syste

SUBMITTER: O'Ghaffari H 

PROVIDER: S-EPMC10589702 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature