Karin A. Dahmen

University of Illinois Urbana-Champaign

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Yehuda Ben‐Zion

Southern California University for Professional Studies

Jonathan T. Uhl

University of Illinois Urbana-Champaign

Wendelin J. Wright

Bucknell University

Peter K. Liaw

University of Tennessee at Knoxville

Michael LeBlanc

University of Illinois Urbana-Champaign

Yong Zhang

Chinese Academy of Sciences

E. W. Carlson

Purdue University West Lafayette

Braden A. W. Brinkman

Stony Brook University

James Antonaglia

University of Michigan–Ann Arbor

Deniz Ertaş

ExxonMobil (United States)

Cooperative Institutions

University of Illinois Urbana-Champaign

Oak Ridge National Laboratory

University of Tennessee at Knoxville

Harvard University

Los Alamos National Laboratory

Chinese Academy of Sciences

College of Wooster

Cornell University

Universitat de Barcelona

University of Cambridge

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Universal avalanche dynamics: From nano-crystals, to bulk metallic glasses, to earthquakes and stars?

Bulletin of the American Physical Society (2018)

Karin A. Dahmen

Dynamics

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Erratum to: Temperature Effects on Deformation and Serration Behavior of High-Entropy Alloys (HEAs)

JOM (2014)

James Antonaglia Xufei Xie Zijian Tang Che‐Wei Tsai Junwei Qiao

Science park

National laboratory

Science and engineering

10.1007/s11837-014-1190-x

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Citations (5)

Why the Crackling Deformations of Single Crystals, Metallic Glasses, Rock, Granular Materials, and the Earth's Crust Are So Surprisingly Similar

Frontiers in Physics (2019)

Karin A. Dahmen Jonathan T. Uhl Wendelin J. Wright

Recent experiments show that the deformation properties of a wide range of solid materials are surprisingly similar. When slowly pushed, they deform via intermittent slips, similar to earthquakes. The statistics of these slips agree across vastly different structures and scales. A simple analytical model explains why this is the case. The model also predicts which statistical quantities are independent of the microscopic details (i.e., they are "universal"), and which ones are not. The model provides physical intuition for the deformation mechanism and new ways to organize experimental data. It also shows how to transfer results from one scale to another. The model predictions agree with experiments. The results are expected to be relevant for failure prediction, hazard prevention, and the design of next-generation materials.

Intuition

Deformation mechanism

10.3389/fphy.2019.00176

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Controlling avalanche criticality in 2D nano arrays

Scientific Reports (2013)

Yaara Zohar Shira Yochelis Karin A. Dahmen G. Jung Yossi Paltiel

Many physical systems respond to slowly changing external force through avalanches spanning broad range of sizes. Some systems crackle even without apparent external force, such as bursts of neuronal activity or charge transfer avalanches in 2D molecular layers. Advanced development of theoretical models describing disorder-induced critical phenomena calls for experiments probing the dynamics upon tuneable disorder. Here we show that isomeric structural transitions in 2D organic self-assembled monolayer (SAM) exhibit critical dynamics with experimentally tuneable disorder. The system consists of field effect transistor coupled through SAM to illuminated semiconducting nanocrystals (NCs). Charges photoinduced in NCs are transferred through SAM to the transistor surface and modulate its conductivity. Avalanches of isomeric structural transitions are revealed by measuring the current noise I(t) of the transistor. Accumulated surface traps charges reduce dipole moments of the molecules, decrease their coupling and thus decrease the critical disorder of the SAM enabling its tuning during experiments.

10.1038/srep01845

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Universality of slip avalanches in flowing granular matter

Nature Communications (2016)

Д. В. Денисов Kinga A. Lőrincz Jonathan T. Uhl Karin A. Dahmen Peter Schall

Abstract The search for scale-bridging relations in the deformation of amorphous materials presents a current challenge with tremendous applications in material science, engineering and geology. While generic features in the flow and microscopic dynamics support the idea of a universal scaling theory of deformation, direct microscopic evidence remains poor. Here, we provide the first measurement of internal scaling relations in the deformation of granular matter. By combining macroscopic force fluctuation measurements with internal strain imaging, we demonstrate the existence of robust scaling relations from particle-scale to macroscopic flow. We identify consistent power-law relations truncated by systematic pressure-dependent cutoff, in agreement with recent mean-field theory of slip avalanches in elasto-plastic materials, revealing the existence of a mechanical critical point. These results experimentally establish scale-bridging relations in the flow of matter, paving the way to a new universal theory of deformation.

Granular matter

10.1038/ncomms10641

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Citations (114)

Publisher Correction: Scaling of domain cascades in stripe and skyrmion phases

Nature Communications (2019)

Arnab Singh J. C. T. Lee Karina E. Avila Y. Chen Sergio Montoya

The original version of this Article contained an error in Fig. 4d, in which the label of the region to the left of the white dashed lines incorrectly read ‘Order stripes’. The correct version states ‘Disorder stripes’. This has been corrected in both the PDF and HTML versions of the Article.

Skyrmion

10.1038/s41467-019-10314-w

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Changes in the Distribution of Avalanches on a Conical Bead Pile with Cohesion

Bulletin of the American Physical Society (2016)

Justine Walker Susan Lehman Karin A. Dahmen Michael LeBlanc Jonathan T. Uhl

Bead

Cohesion (chemistry)

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