title: Slip statistics of dislocation avalanches under different loading modes.
abstract: Slowly compressed microcrystals deform via intermittent slip events, observed as displacement jumps or stress drops. Experiments often use one of two loading modes: an increasing applied stress (stress driven, soft), or a constant strain rate (strain driven, hard). In this work we experimentally test the influence of the deformation loading conditions on the scaling behavior of slip events. It is found that these common deformation modes strongly affect time series properties, but not the scaling behavior of the slip statistics when analyzed with a mean-field model. With increasing plastic strain, the slip events are found to be smaller and more frequent when strain driven, and the slip-size distributions obtained for both drives collapse onto the same scaling function with the same exponents. The experimental results agree with the predictions of the used mean-field model, linking the slip behavior under different loading modes.
authors.affiliation: California Institute of Technology, Division of Engineering and Applied Sciences, 1200 East California Boulevard, Pasadena, California 91125, USA.
authors.forename: R
authors.initials: R
authors.lastname: Maass
authors.affiliation: University of Illinois at Urbana-Champaign, Department of Physics, 1110 West Green Street, Urbana, Illinois 61801, USA.
authors.forename: M
authors.initials: M
authors.lastname: Wraith
authors.affiliation: University of Illinois at Urbana-Champaign, Department of Physics, 1110 West Green Street, Urbana, Illinois 61801, USA.
authors.forename: J T
authors.initials: JT
authors.lastname: Uhl
authors.affiliation: California Institute of Technology, Division of Engineering and Applied Sciences, 1200 East California Boulevard, Pasadena, California 91125, USA.|Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Greer
authors.affiliation: University of Illinois at Urbana-Champaign, Department of Physics, 1110 West Green Street, Urbana, Illinois 61801, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Dahmen