Article
Physics, Multidisciplinary
Kuang Liu, Jonathan E. Kollmer, Karen E. Daniels, J. M. Schwarz, Silke Henkes
Summary: In experiments on sheared two-dimensional frictional granular materials, rigidity emerges as a rigid backbone interspersed with floppy, particle-filled holes, creating a spongelike morphology. This rigid structure, identified at a critical contact number, exhibits higher pressure within than outside, suggesting the importance of focusing on mechanical stability arising through arch structures and hinges at the mesoscale.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Yuliang Jin, Hajime Yoshino
Summary: The concept of jamming has attracted great research interest due to its broad relevance in soft-matter and its connection to sphere packing and optimization problems. The study shows that amorphous jammed states of frictionless spheres can be extended from a fixed density jamming-point to a jamming-plane that spans density and shear strain axes. The jamming-plane can be divided into reversible-jamming and irreversible-jamming regimes, reflecting the escape from metastable glass basins.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Physical
Diego Berzi, Kevin E. Buettner, Jennifer S. Curtis
Summary: The study involved discrete numerical simulations of dense, steady, homogeneous flows of true cylinders interacting via Hertzian contacts, with and without friction. Critical values of solid volume fraction and average number of contacts per particle were determined, above which rate-independent components of stresses developed, and fluctuations of angular velocity increased sharply. The study showed that kinetic theory could quantitatively predict measured fluctuations of translational velocity for rigid cylinders, especially at solid volume fractions larger than 0.49.
Article
Chemistry, Physical
Chao-Chun Hsu, Feng-Chun Hsia, Bart Weber, Matthijn B. de Rooij, Daniel Bonn, Albert M. Brouwer
Summary: When two macroscopic objects touch, their real contact is often made up of multiple surface irregularities, which deform under pressure. Shear force causes the objects to slide and breaks the initial contact. This study uses a fluorescent mechanophore to visualize and quantify local interfacial shear force, and investigates the evolution of microscopic shear force from static to dynamic friction. The findings show that the macroscopic coefficient of friction accurately describes microscopic friction, and that sliding begins at the edge and propagates towards the center of the contact area.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Chao-Chun Hsu, Feng-Chun Hsia, Bart Weber, Matthijn B. de Rooij, Daniel Bonn, Albert M. Brouwer
Summary: When two macroscopic objects touch, the contact is composed of multiple surface asperities that deform under pressure. Applying a shear force breaks the initial contact and causes sliding. The use of a fluorogenic mechanophore allows for visualization and quantification of the local interfacial shear force. The macroscopic coefficient of friction accurately describes the microscopic friction.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Ryotaro Koshoji, Mitsuaki Kawamura, Masahiro Fukuda, Taisuke Ozaki
Summary: Through an unbiased random search approach, 12 putative densest binary sphere packings have been discovered, leading to an updated phase diagram. It was found that in the small radius range, multiple structures compete with each other for high packing fraction, achieved by introducing distortion or combining a few local dense structural units.
Article
Physics, Fluids & Plasmas
Jack R. Dale, James D. Sartor, R. Cameron Dennis, Eric I. Corwin
Summary: A spatial distribution is considered hyperuniform if local density fluctuations disappear at long length scales. Recent research has shown that jammed systems exhibit complex behaviors instead of disordered hyperuniformity at long lengths. By using Voronoi tessellation and rescaling transformations, hyperuniform, mechanically stable packings can be iteratively generated in simulations. These packings display atypical mechanical properties, particularly in low-frequency phononic excitations.
Article
Physics, Multidisciplinary
James D. Sartor, Eric I. Corwin
Summary: The study reveals that excess contacts in amorphous systems of soft particles can prevent mechanical equilibrium, and defect contacts can be uniquely identified by examining the boundaries of the force network ensemble. In simulations near the jamming limit, this identification is almost always correct, and defect contacts are broken when the system is decompressed.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Dong Wang, Nima Nejadsadeghi, Yan Li, Shashi Shekhar, Anil Misra, Joshua A. Dijksman
Summary: Experimental measurements on rotating round particles in amorphous disk packing near rigidification reveal diffusive microrotation induced by shear, which is enhanced or suppressed based on volume fraction and inter-particle friction, with persistent anticorrelated motion. Spatial correlations in microrotation are directly related to system pressure, indicating the broader mechanical relevance of collective dynamics in rotational degree of freedom of particles.
Article
Physics, Fluids & Plasmas
Joseph M. Monti, Ishan Srivastava, Leonardo E. Silbert, Jeremy B. Lechman, Gary S. Grest
Summary: This study calculates the static structure factors of large-scale, mechanically stable, jammed packings of frictionless spheres and disks with broad size dispersity. The analysis of the power-law behavior of the structure factors reveals that in three dimensions, the structural fractal dimension (df) is approximately 2.0 for -beta values between 2.5 and 3.8, allowing the collapse of structure factors onto a universal curve. In two dimensions, the fractal dimension (df) ranges from 1.0 to 1.34 for -beta values between 2.1 and 2.9. Additionally, the fractal behavior persists even after removing rattler particles, indicating that the long-wavelength structural properties of the packings are controlled by the large particle backbone conferring mechanical rigidity to the system.
Article
Geochemistry & Geophysics
Benjamin D. Belzer, Melodie E. French
Summary: Chlorite, a phyllosilicate mineral, was studied to understand its role in fault slip. The experiments revealed that its frictional strength increases with temperature and transitions from rate-strengthening to rate-weakening behavior. The results suggest that the rate-weakening behavior is controlled by time-dependent properties of water adsorbed to mineral surfaces.
Article
Mathematics, Interdisciplinary Applications
Francois Bonneau, Luc Scholtes, Hugo Rambure
Summary: The discrete element method (DEM) is a powerful tool for simulating complex mechanical behaviors by discretizing the targeted medium with particles. The properties of particle assemblies used in DEM simulations directly impact the behavior of the simulated medium. Generating particle assemblies to avoid bias induced by their fabric and conforming with the structural discontinuities of the medium is critical for accurate simulations.
COMPUTATIONAL PARTICLE MECHANICS
(2021)
Article
Engineering, Chemical
R. Balevicius, Z. Mroz
Summary: This study investigates the frictional dissipation and energy stored in two spherical grains under sliding or combined slip-sliding conditions. Analytical formulae are proposed for predicting the work of driving force, kinetic, dissipated, and stored energies. Mathematical insight into the evolution and redistribution of these energies over contact interfaces is achieved by controlling energy balance.
Article
Computer Science, Information Systems
Nihar Gargava, Vlad Serban
Summary: This article obtains algorithmically effective versions of dense lattice sphere packings constructed from orders in Q-division rings. The lattices discussed are lifts of suitable codes from prime characteristic to orders O in Q-division rings, and a Minkowski-Hlawka type result for such lifts is proven. By exploiting the additional symmetries under finite subgroups of units in O, effective constructions of lattices approaching the best known lower bounds on the packing density ?(n) in various new dimensions n are achieved. This unifies and extends previous constructions.
IEEE TRANSACTIONS ON INFORMATION THEORY
(2023)
Article
Mathematics
Dimitrios Ntalampekos
Summary: A Sierpinski packing in the 2-sphere refers to a countable collection of disjoint, non-separating continua with diameters shrinking to zero. We prove that any Sierpinski packing by continua whose diameters are square-summable can be uniformized by a disk packing with a packing-conformal map, which generalizes conformality in open sets. Sierpinski carpets and some domains, as special cases of Sierpinski packings, can also be uniformized by disk packings. As a corollary, the conformal loop ensemble (CLE) carpets can be conformally uniformized by disk packings, answering a question of Rohde-Werness.
ADVANCES IN MATHEMATICS
(2023)
Article
Instruments & Instrumentation
Axelle Amon, Philip Born, Karen E. Daniels, Joshua A. Dijksman, Kai Huang, David Parker, Matthias Schroeter, Ralf Stannarius, Andreas Wierschem
REVIEW OF SCIENTIFIC INSTRUMENTS
(2017)
Correction
Instruments & Instrumentation
Axelle Amon, Philip Born, Karen E. Daniels, Joshua A. Dijksman, Kai Huang, David Parker, Matthias Schroeter, Ralf Stannarius, Andreas Wierschem
REVIEW OF SCIENTIFIC INSTRUMENTS
(2017)
Article
Physics, Multidisciplinary
Frank Rietz, Charles Radin, Harry L. Swinney, Matthias Schroeter
PHYSICAL REVIEW LETTERS
(2018)
Article
Chemistry, Physical
Anais Giustiniani, Simon Weis, Christophe Poulard, Paul H. Kamm, Francisco Garcia-Moreno, Matthias Schroeter, Wiebke Drenckhan
Article
Chemistry, Physical
Jan Haeberle, Andre Schella, Matthias Sperl, Matthias Schroeter, Philip Born
Article
Physics, Fluids & Plasmas
R. Moosavi, M. Schroeter, S. Herminghaus
PHYSICAL REVIEW FLUIDS
(2018)
Article
Engineering, Petroleum
Thomas Hiller, Julie Ardevol-Murison, Ann Muggeridge, Matthias Schroeter, Martin Brinkmann
Article
Instruments & Instrumentation
Manuel Baur, Norman Uhlmann, Thorsten Poeschel, Matthias Schroeter
REVIEW OF SCIENTIFIC INSTRUMENTS
(2019)
Article
Physics, Multidisciplinary
Peidong Yu, Matthias Schroeter, Matthias Sperl
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Jonathan E. Kollmer, Tara Shreve, Joelle Claussen, Stefan Gerth, Michael Salamon, Norman Uhlmann, Matthias Schroeter, Thorsten Poeschel
PHYSICAL REVIEW LETTERS
(2020)
Article
Astronomy & Astrophysics
Birko-Katarina Ruzicka, Matthias Schroeter, Andreas Pack, Hermann Boehnhardt
Summary: The method utilizes properties of the frequency domain in images found by using the Fourier transform and effectively detects and analyzes lineament structures on the Hathor cliff of comet 67P, revealing important insights into the comet's formation and evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Marius Pfeifer, Jessica Agarwal, Matthias Schroeter
Summary: This study used data from the European Space Agency's Rosetta mission to track the motion of particles in image sequences and derive their velocities and accelerations. An algorithm was developed to locate the particles and reconstruct their tracks using the image sequences' pair-nature. The study found significant information about potential genuine particle tracks and obtained preliminary results on velocity, acceleration, and radius distributions.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Instruments & Instrumentation
P. Born, M. Braibanti, L. Cristofolini, S. Cohen-Addad, D. J. Durian, S. U. Egelhaaf, M. A. Escobedo-Sanchez, R. Hoehler, T. D. Karapantsios, D. Langevin, L. Liggieri, M. Pasquet, E. Rio, A. Salonen, M. Schroeter, M. Sperl, R. Suetterlin, A. B. Zuccolotto-Bernez
Summary: An experiment container with light scattering and imaging diagnostics has been developed for studying soft matter aboard the ISS. It offers measurement capabilities to study different materials using exchangeable sample cell units. The experiment container has shown its capabilities in studying various materials based on initial results obtained on ground and during commissioning on the ISS.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Chemistry, Physical
R. Moosavi, A. Kumar, A. De Wit, M. Schroeter
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)
Article
Physics, Fluids & Plasmas
Andre Schella, Simon Weis, Matthias Schroeter
