Particularly, 1 the mechanisms of amplification of an input via the architecture of the materials and 2 the programmability of a complex response using a simple mode of actuation. Organizers: PT Brun pbrun princeton. PT Brun pbrun princeton.
These problems have in common the slow flow of a viscous fluid interacting with a compliant object or boundary. The justification of the proposed focus session is that the variety and complexity of such problems at the interface of fluid mechanics and soft matter physics requires an interdisciplinary approach harnessing the skills of solid mechanicians, fluid mechanicians and soft matter physicists including nonlinear and condensed matter physicists to make progress on predictive models anchored on fundamental physics.
Organizers: Ivan C. Christov christov purdue. Machine learning has generated much recent excitement within the physics community, and provides a powerful new tool to analyze and understand many physical systems. Usage of machine learning is still in its infancy, and many interesting challenges remain unexplored.
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What machine learning methods are most appropriate? How do we use these tools most effectively? Should experimental procedures be redesigned to take advantage of machine learning? Organizers: Shmuel Rubinstein shmuel seas. Rycroft chr seas. Rycroft, chr seas. Mechanical, biological and chemical systems have recently demonstrated the ability to realize, process and relay information in ways and at scales superior to that of traditional electronic computing. This focus session on programmable matter will address how logical operations, pattern recognition, optimization and other computing tasks may be realized in diverse material systems.
Recent sessions on metamaterials, actuated structures, structures designed by artificial intelligence and robotic systems have dealt with programming matter. This session will address similar work from a different perspective. Organizers: Zeb Rocklin zebrocklin gatech. The physical properties of nonequilibrium matter can differ fundamentally from those of equilibrium systems, and mechanics is no exception.
Recently, several groups have demonstrated that assemblies of active, dynamic, or driven elements can harbor unique large-scale mechanical and acoustic properties such as one-way transport, nonreciprocity, self-locomotion, and controlled amplification. While the specific realizations range from metamaterials to robotic assemblies to biological networks, they share the unifying theme that the novel mechanical behavior emerges from interactions among active building blocks. Progress in this area will involve both theoretical and computational advances to describe the elastic properties of dynamic assemblies, as well as experimental developments to fabricate and characterize candidate materials with nonequilibrium elements.
This focus session aims to showcase new and future developments in this burgeoning field, and to bring together researchers from diverse disciplines to work towards a common physical framework and inspire new collaborations.
Relating Dynamic Properties to Atomic Structure in Metallic Glasses | SpringerLink
Organizers: Corentin Coulais coulais uva. Active matter is a prominent area of research in soft matter, given the opportunity to learn new physics active materials are out of equilibrium , engineer new materials e. This is highlighted in a recent review article in Reviews of Modern Physics on "Active particles in complex and crowded environments" by Bechinger et al.
This session will focus on this new direction in active matter research. A broad variety of soft structures of current and perennial interest derive their mechanical response from properties that are less material than geometric.
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Symmetries, structural thinness, metric constraints such as curvature or twist, fractal dimension, complex patterning and structural correlations statistics are all geometrical quantities that can determine patterns of stress, strain and nonlinear deformations across a system. Such considerations are widespread in the soft, nonlinear, polymer and bio communities at APS.
This session focuses on a variety of problems in soft mechanics where geometry plays a critical role, and showcase common themes in the emergent properties of these systems. What is the nature of the yielding transition in solids? Is this transition different in crystals and glasses? In spite of many years of work, and the obvious technological and scientific importance of this subject, there is no clear consensus. The purpose of this focus session will be to bring researchers from different groups to explore how these various threads of reasoning inter-connect, and to see whether a consensus, leading to greater understanding of this phenomena, is possible.
This FOCUS session addresses fundamental theoretical questions that are at the heart of rigidity and flow in soft matter defined broadly, specifically from groups working on phenomena such as yielding and shear banding in systems ranging from crystals to gels to glasses. Organizers: Bulbul Chakraborty bulbul brandeis. This focus session deals with the flow, deformation, and physics of liquid interfaces with adsorbed surface active species. Such complex interfaces have unique and rich interfacial physics that govern their behavior.
Importantly, these interfacial properties affect the bulk behavior of soft matter. Organizers: Gordon Christopher gordon. Kinetic theory is a powerful technique in theoretical physics that allows to derive an effective macroscopic description of a physical system by integrating out formally its underlying microscopic degrees of freedom.
First formulated in the context of dilute gases, it is still widely used throughout the sciences nowadays. The aim of this Focus Session is twofold: 1 to provide a pedagogical introduction to this important technique accessible also to non-experts and 2 to present an overview of the state-of-the-art research employing this methodology not only in physics, but also in biology, finance and the social sciences. Organizers: Andrea Cairoli andrea.
See a Problem?
Sano tomohiko. As soft condensed matter physics has matured and grown, it is responsible to discuss a roadmap of the fundamental questions and challenges that will, along with new discoveries, influence the future of the field and to address the resources that will be needed. This workshop will produce a similar roadmap, and will foster a lively exchange of new ideas as participants will want to see that the most exciting and current science is included. Organizers: Paul Chaikin chaikin nyu. One of the main aims of soft matter physics is to find the microscopic principles that underpin the mechanical behavior of soft materials such as gels, elastomers, composites and polymeric, structured and multiphase fluids.
A main challenge in these efforts is to be able to spatially resolve the response of soft materials under applied stress or flow at the relevant length and time scales. Similarly, measurement and visualization of mechanical properties of soft biological tissues has been an area of active research in medical physics, where such information is anticipated to lead to new diagnostic capabilities.
Both fields have independently seen tremendous developments in the last decades. Yet despite their overlapping aims, soft matter physics and medical physics rarely benefit from each other's progress. The aim of this focus session is to bring these two communities together and exchange expertise on measurement techniques and data analysis methods in the optical imaging domain, such as OCT, Brillouin spectroscopy, the many forms of laser speckle imaging and optical tweezing.
Most macroscopic systems in nature evolve in time in the presence of either extrinsic or intrinsic noise.
Understanding these noisy nonlinear dynamical systems has thus always been of central importance and interest in contemporary physics. Stochastic fluctuations, noise-induced correlations, spontaneous pattern formation, and even generically scale-invariant phases play an essential role in characterizing non-equilibrium systems and constitute a highly active eld of current research, both in experimental studies as well as in analytical theory and numerical investigations. Moreover, exploring potential external control of their characteristic features has become a fertile research area in recent years, addressing the design, optimization, and emergent behavior of stochastic non-linear systems.
Although granular materials have received considerable attention, we still do not have a complete description of their collective behavior under external driving. This focus session will highlight studies aimed at understanding crystallization in both wet and dry granular materials undergoing vibration, cyclic and continuous shear, or other driving mechanisms. Studies of the evolving structure and the dynamics such as nucleation and growth during crystallization will help establish a theoretical framework for ordering transitions in driven, dissipative systems.
We seek abstracts from interdisciplinary researchers in mechanics, physics, materials science and engineering performing experimental, theoretical, and computational studies of crystallization in granular materials. This focus session will catalyze new collaborations aimed at understanding how external driving controls the collective dynamics of granular media.
Fabric, knitted and knotted structures are ubiquitous in our every-day life.
Each morning, we get dressed in clothes that serve a multitude of functions, from keeping us warm and dry, to just style. Furthermore, our shoes often contain laces, which, after decades of trying, most of us still tie in the wrong i. Knots are also instrumental to many other activities including sailing, climbing, and surgery, where their mechanical failure can lead to drastic consequences. These technologies have been an integral part of society for millennia, even if their design, manufacturing, and usage tends to rely primarily on empirical principles.
The necessary ingredients for modeling include the geometry and topology of the filaments, self contact and friction, and the extent of intrinsic disorder. Part of the motivation to revisit these systems is a drive to more thoroughly rationalize their mechanical performance. Perhaps an even more significant motivation for the recent developments has been the recognition that revisiting the study of fabrics, knits, and knots can lead to novel ideas for the design of metamaterials with novel features, functions, and properties. With this focus session, we seek to bring together representatives from the various groups studying fabrics, knits, and knots to cross-pollinate research methodologies, identify previously unrecognized connections in modeling strategies, and explore new research directions.
The proposed venue will provide a modern unified perspective to these systems, under the umbrella of the mechanics, geometry, and topology of the underlying structures. In recent times, there have been significant advances in developing responsive soft materials, at the interfaces of physics, chemistry, materials science and engineering.
Glassy Metals II
Promising materials systems that can be made to respond, on-demand, to an external stimulus include hydrogels that can swell, magneto-rheological and dielectric elastomers that can be actuated using magnetic and electric fields and pneumatic actuators. The constitutive descriptions e.
The next frontier in this class of problems is to take the existing knowledge at the material level to devise active and extremely deformable structures to enable novel devices that benefit from the interplay between their shape and distributed actuation.