A5032394387- Structural Analysis and Optimization
- Advanced Materials and Mechanics
- Mechanical Behavior of Composites
- Composite Structure Analysis and Optimization
- Composite Material Mechanics
- Cardiac Health and Mental Health
- Advanced Sensor and Energy Harvesting Materials
- Dynamics and Control of Mechanical Systems
- Elasticity and Material Modeling
- Vibration and Dynamic Analysis
- Cardiac Imaging and Diagnostics
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Fiber-reinforced polymer composites
- Adhesion, Friction, and Surface Interactions
- Liquid Crystal Research Advancements
- Topology Optimization in Engineering
- Cellular Mechanics and Interactions
- Stroke Rehabilitation and Recovery
- Mechanical Engineering and Vibrations Research
- Insect and Arachnid Ecology and Behavior
- Plant and animal studies
- Modular Robots and Swarm Intelligence
- Heart Rate Variability and Autonomic Control
- Industrial Automation and Control Systems
- Robotic Mechanisms and Dynamics
University of Colorado Boulder
2017-2025
University of Colorado System
2018-2025
Mayo Clinic in Arizona
2018-2024
University of Minnesota Rochester
2024
Hospital Universitario Ramón y Cajal
2023
Mayo Clinic
2018-2020
Mayo Clinic in Florida
2019
Hospital General Universitario Gregorio Marañón
2018
Massachusetts Institute of Technology
2015-2017
École Polytechnique
2012-2013
We study the effect of a dimplelike geometric imperfection on critical buckling load spherical elastic shells under pressure loading. This investigation combines precision experiments, finite element modeling, and numerical solutions reduced shell theory, all which are found to be in excellent quantitative agreement. In geometry magnitude defect can designed precisely fabricated through customizable rapid prototyping technique. Our primary focus is predictively describing sensitivity provide...
We study the buckling of hemispherical elastic shells subjected to combined effect pressure loading and a probing force. perform an experimental investigation using thin nearly uniform thickness that are fabricated with well-controlled geometric imperfection. By systematically varying indentation displacement geometry probe, we probe-induced deflections have on strength our spherical shells. The results then compared finite element simulations, as well recent theoretical predictions from...
Cardiac rehabilitation (CR) is recommended in clinical practice guidelines, but dose prescribed varies highly by country. This study characterized the offered supervised CR programs and alternative models worldwide their potential correlates.In this cross-sectional study, an online survey was administered to globally. associations local champions facilitated program identification. Countries were classified based on region income categories. Dose operationalized as duration×sessions per...
Alternative models of cardiac rehabilitation (CR) delivery, such as home or community-based programs, have been developed to overcome underutilization. However, their availability and characteristics never assessed globally. In this cross-sectional study, a piloted survey was administered online CR programs available in 111/203 (54.7%) countries globally; data were collected 93 (83.8% country response rate). 1082 surveys (32.1% program rate) initiated. Globally, 85 (76.6%) with offered...
We investigate the influence of curvature and topology on crystalline dimpled patterns surface generic elastic bilayers. Our numerical analysis predicts that total number defects created by adiabatic compression exhibits universal quadratic scaling for spherical, ellipsoidal, toroidal surfaces over a wide range system sizes. However, both localization individual orientation defect chains depend strongly local Gaussian its gradients across surface. results imply can be utilized to pattern in...
We explore the effect of precisely defined geometric imperfections on buckling load spherical shells under external pressure loading, using finite-element analysis that was previously validated through precision experiments. Our numerical simulations focus limit large amplitude defects and reveal a lower bound depends solely shell radius to thickness ratio angular width defect. It is shown that, in limit, an single parameter, even for moderate ratio. Moreover, results knockdown factor are...
A class of soft color composites whose light transmittance can be actively tuned and controlled through mechanical actuation is studied. The design comprises thin sheets polydimethylsiloxane, an optically clear silicone‐based rubber, that mixed with a colloidal suspension black micrometer‐sized dye particles to provide tunable opacity the specimens. thickness samples reduced by loading (e.g., pneumatically), which modulates and, in turn, as much 40%. mechanism independent specific method...
We present a new design for Solar Sail Tubular Mast (SSTM), lightweight version of the Trussed Collapsible (TCTM) previously designed by Opterus. The mast is as tape-spring based truss, made High Strain Composites, that flattenable and rollable. Curvature in longerons increase buckling load, battens provide partially closed cross-section thatincreases torsional stiffness with respect to open designs. performed finite element simulations explore effect geometry (width battens, number battens)...
Elastically deformable hinges or deployable booms commonly follow architectures with face-skin layers only, cutting out the core to facilitate folding. This significantly reduces shear stiffness of hinge, which might reduce first resonance frequency structure. We rationalize free vibration system and interplay between shearing bending deformation by deriving an analytical formulation using Timoshenko’s beam theory. The framework is derived for a general applied case two flexures arbitrary...
Abstract We present a combined experimental and analytical approach to study the formation of creases in tightly folded Kapton polyimide films. In experiments, we have developed robust procedure create with repeatable residual fold angle by compressing initially bent coupons. then use it explore influence different control parameters, such as force applied, time film is being pressed. The results are compared simplified one-dimensional elastica model, well high fidelity finite element model;...
<strong>Background:</strong> Cardiac rehabilitation (CR) is recommended in clinical practice guidelines for comprehensive secondary prevention. While India has a high burden of cardiovascular diseases (CVD), availability and nature services delivered there unknown. In this study, we undertook analysis the Indian data from global CR audit survey, conducted by International Council Cardiovascular Prevention Rehabilitation (ICCPR). <strong>Methods:</strong> cross-sectional an online survey was...
We introduce a new experimental system to study the effects of pre-stretch on buckling patterns that emerge from biaxial compression elastomeric bilayer shells. Upon fabrication samples, releasing in substrate through deflation places outer film state and yields variety patterns. systematically explore parameter space by varying ratio between stiffness film. The phase diagram exhibits patterns: classic periodic wrinkle creases, folds, high aspect ridges. Our is capable readily transitioning...
Recent advances in active soft structures envision the large deformations resulting from mechanical instabilities as routes for functional shape morphing. Numerous such examples exist filamentary and plate systems. However, with double-curved shells are rarer, progress hampered by challenges fabrication complexities involved analyzing their underlying geometrical nonlinearities. We show that on-demand patterning of hemispherical can be achieved through constrained buckling. Their...