Nathan C. Keim
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View article: Ordered Buckling Structures in a Twisted Crimped Tube dataset
Ordered Buckling Structures in a Twisted Crimped Tube dataset Open
This spreadsheet file contains the data that support the findings of a paper titled, 'Ordered Buckling Structures in a Twisted Crimped Tube'
View article: Symmetry and Memory in Driven Disordered Systems
Symmetry and Memory in Driven Disordered Systems Open
Steadily shearing a non-Brownian suspension forms a memory of direction in its structure, while periodically shearing it forms a memory of amplitude. Our experiments show that these memories coexist and compete within a limited memory capa…
View article: Generalizing multiple memories from a single drive: The hysteron latch
Generalizing multiple memories from a single drive: The hysteron latch Open
Far-from-equilibrium systems can form memories of previous deformations or driving. In systems from sheared glassy materials to buckling beams to crumpled sheets, this behavior is dominated by return-point memory, in which revisiting a pas…
View article: Mechanical Memories in Solids, from Disorder to Design
Mechanical Memories in Solids, from Disorder to Design Open
Solids are rigid, which means that when left undisturbed, their structures are nearly static. It follows that these structures depend on history—but it is surprising that they hold readable memories of past events. Here, we review the rese…
View article: Mechanical memories in solids, from disorder to design
Mechanical memories in solids, from disorder to design Open
Solids are rigid, which means that when left undisturbed, their structures are nearly static. It follows that these structures depend on history -- but it is surprising that they hold readable memories of past events. Here we review the re…
View article: Twisting a Cylindrical Sheet Makes It a Tunable Locking Material
Twisting a Cylindrical Sheet Makes It a Tunable Locking Material Open
A buckled sheet offers a reservoir of material that can be unfurled at a later time. For sufficiently thin yet stiff materials, this geometric process has a striking mechanical feature: when the slack runs out, the material locks to furthe…
View article: Generalizing multiple memories from a single drive: The hysteron latch
Generalizing multiple memories from a single drive: The hysteron latch Open
Far-from-equilibrium systems can form memories of previous deformations or driving. In systems from sheared glassy materials to buckling beams to crumpled sheets, this behavior is dominated by return-point memory, in which revisiting a pas…
View article: A wrinkled cylindrical shell as a tunable locking material
A wrinkled cylindrical shell as a tunable locking material Open
A buckled sheet offers a reservoir of material that can be unfurled at a later time. For sufficiently thin yet stiff materials, this geometric process has a striking mechanical feature: when the slack runs out, the material locks to furthe…
View article: Mechanical annealing and memories in a disordered solid
Mechanical annealing and memories in a disordered solid Open
Shearing a disordered or amorphous solid for many cycles with a constant strain amplitude can anneal it, relaxing a sample to a steady state that encodes a memory of that amplitude. This steady state also features a remarkable stability to…
View article: Supplemental image data for "Mechanical annealing and memories in a disordered solid"
Supplemental image data for "Mechanical annealing and memories in a disordered solid" Open
This archive contains raw and subtracted experimental images of a 2D colloidal disordered solid, sufficient to verify the major qualitative results of the paper "Mechanical annealing and memories in a disordered solid" by Nathan C. Keim an…
View article: Supplemental image data for "Mechanical annealing and memories in a disordered solid"
Supplemental image data for "Mechanical annealing and memories in a disordered solid" Open
This archive contains raw and subtracted experimental images of a 2D colloidal disordered solid, sufficient to verify the major qualitative results of the paper "Mechanical annealing and memories in a disordered solid" by Nathan C. Keim an…
View article: Relationships among structure, memory, and flow in sheared disordered materials
Relationships among structure, memory, and flow in sheared disordered materials Open
A fundamental challenge for disordered solids is predicting macroscopic yield from the microscopic arrangements of constituent particles. Yield is accompanied by a sudden and large increase in energy dissipation due to the onset of plastic…
View article: soft-matter/trackpy: Trackpy v0.5.0
soft-matter/trackpy: Trackpy v0.5.0 Open
This is a major release focused on enhancements. Most notably, parallel processing is now turned on by default for "trackpy.batch" and "trackpy.locate_brightfield_ring", resulting in a large performance increase for many users. Another min…
View article: Scaling of relaxation and excess entropy in plastically deformed amorphous solids
Scaling of relaxation and excess entropy in plastically deformed amorphous solids Open
Significance When stressed sufficiently, many solids plastically deform and flow. This plastic deformation induces irreversible structural changes, which are sometimes used in practice to manipulate microstructure of materials to achieve d…
View article: soft-matter/trackpy: Trackpy v0.4.2
soft-matter/trackpy: Trackpy v0.4.2 Open
This is a minor release with two major new features: parallel processing to speed up feature-finding, and a new method for locating features in bright-field microscopy. There is also an overhaul of the walkthrough and other tutorials, and …
View article: Memory formation in matter
Memory formation in matter Open
Memory formation in matter is a theme of broad intellectual relevance; it sits at the interdisciplinary crossroads of physics, biology, chemistry, and computer science. Memory connotes the ability to encode, access, and erase signatures of…
View article: Memory in a Contact Line
Memory in a Contact Line Open
We study the behavior of the liquid-solid-vapor contact line of water held in a narrow gap between two plates. A syringe pump injects and withdraws a constant, small volume of the water, driving the contact line back and forth repeatedly a…
View article: Reversible Motion of a Contact Line
Reversible Motion of a Contact Line Open
When a body of liquid sits on a surface, an irregular border between the wet and dry regions of the surface exists, called the contact line. Driving this contact line back and forth repeatedly can change its shape.We use a syringe pump to …
View article: Minimal descriptions of cyclic memory behaviors.
Minimal descriptions of cyclic memory behaviors. Open
Many materials that are out of equilibrium can learn one or more inputs that are repeatedly applied. Yet, a common framework for understanding such memory behaviors is lacking. Here we construct minimal representations of cyclic memory beh…
View article: trackpy: Trackpy v0.4.1
trackpy: Trackpy v0.4.1 Open
This is a minor release with some important fixes. Additionally, PIMS is nolonger a required dependency, which makes installation easier. See http://soft-matter.github.io/trackpy/v0.4/whatsnew.html for a full overview of the changes. Note:…
View article: Structure-property relationships from universal signatures of plasticity in disordered solids
Structure-property relationships from universal signatures of plasticity in disordered solids Open
Behavioral universality across size scales Glassy materials are characterized by a lack of long-range order, whether at the atomic level or at much larger length scales. But to what extent is their commonality in the behavior retained at t…
View article: Structure-property relationships from universal signatures of plasticity in disordered solids
Structure-property relationships from universal signatures of plasticity in disordered solids Open
When deformed beyond their elastic limits, crystalline solids flow plastically via particle rearrangements localized around structural defects. Disordered solids also flow, but without obvious structural defects. We link structure to plast…
View article: A Crumpled Sheet’s Remembrance of Things Past
A Crumpled Sheet’s Remembrance of Things Past Open
We observe nonmonotonic aging and memory effects, two hallmarks of glassy dynamics, in two disordered mechanical systems: crumpled thin sheets and elastic foams.Under fixed compression, both systems exhibit monotonic nonexponential relaxat…
View article: trackpy: Trackpy v0.3.2
trackpy: Trackpy v0.3.2 Open
This release makes trackpy robust against a recent bug in scipy's implementation of cKDTree introduced in v0.18.0 and then fixed. If scipy v0.18.0 is installed, trackpy shows a warning and falls back on KDTree instead of the bug-inflicted …
View article: trackpy: Trackpy v0.3.1
trackpy: Trackpy v0.3.1 Open
This release contains a number of bugfixes and enhancements: pair correlation functions, faster mean squared displacement calculations, and an increase of feature finding precision. See http://soft-matter.github.io/trackpy/v0.3.1/whatsnew.…
View article: trackpy: Trackpy v0.3.0
trackpy: Trackpy v0.3.0 Open
This release is strongly recommended for all users, as it brings major improvements in speed and 3D feature-finding, and many other functionality and accuracy improvements. Please be sure to read the "What's New" page in the documentation …
View article: Role of disorder in finite-amplitude shear of a 2D jammed material
Role of disorder in finite-amplitude shear of a 2D jammed material Open
Using experiments that feature a stable population of repeated structural relaxations, we study the way the response of jammed solids depends on disorder in the materials' structures.