78 citations · 232 across the 20 of their papers we have counts for
22 papers
A Predictive Design Framework for a Soft Robotic Ventricle using Contractile Actuators
Jeongmin Kim, Qiong Wang, Liuyang Cheng +4
The natural cardiac cycle is divided into the systole and diastole phases which encompass four distinct stages: isovolumetric contraction and ejection during systole, followed by i…
Spatiotemporal Disk Packing for Directed Growth of Complex Geometries
Yigit Hergul, Yun Seong Kim, Rohan Shah +2
Growing complex shapes requires control over both where growth begins and how it evolves in time. Here, we introduce a geometric framework for growing prescribed 2D shapes using a…
Embedded Direct Ink Writing of Thermoset and Elastomeric Polymers via Frontal Polymerization
Mohammad Tanver Hossain, Yun Seong Kim, Pallab Layek +10
Direct ink writing (DIW) using frontal ring-opening metathesis polymerization (FROMP) offers a compelling route to the rapid and energy-efficient fabrication of thermoset and elast…
Principles of Use of Tensile J-Curve Materials in Antagonistic Arrangements
Liuyang Cheng, Wonsik Eom, Qiong Wang +8
Natural ligaments are soft connective tissues that must simultaneously provide high stretchability to enable dexterous flexibility and high stiffness to protect the musculoskeletal…
Physics of unraveling and micromechanics of hagfish threads
Mohammad Tanver Hossain, Dakota Piorkowski, Andrew Lowe +5
Hagfish slime is a unique biological material composed of mucus and protein threads that rapidly deploy into a cohesive network when deployed in seawater. The forces involved in th…
High-throughput viscometry via machine-learning from videos of inverted vials
Ignacio Arretche, Mohammad Tanver Hossain, Ramdas Tiwari +6
Although the inverted vial test has been widely used as a qualitative method for estimating fluid viscosity, quantitative rheological characterization has remained limited due to i…
Actuation mechanisms in twisted and coiled polymer actuators using finite element model
Gurmeet Singh, Qiong Wang, Samuel Tsai +3
Twisted and coiled polymer actuators (TCPAs) offer the advantages of large stroke and large specific work as compared to other actuators. There have been extensive experimental inv…
How do imperfections cause asymmetry in elastic snap-through?
Andrea Giudici, Weicheng Huang, Qiong Wang +4
A symmetrically-buckled arch whose boundaries are clamped at an angle has two stable equilibria: an inverted and a natural state. When the distance between the clamps is increased…
Pivot Bearings for Efficient Torsional Magneto-Mechanical Resonators
Chengzhang Li, Ali Kanj, Jiheng Jing +2
Rotating magnets have recently emerged as an efficient method for producing ultra-low frequency signals for through-earth and through-seawater communications. Magneto-mechanical re…
Automated Segmentation and Analysis of Microscopy Images of Laser Powder Bed Fusion Melt Tracks
Aagam Shah, Reimar Weissbach, David A. Griggs +3
With the increasing adoption of metal additive manufacturing (AM), researchers and practitioners are turning to data-driven approaches to optimise printing conditions. Cross-sectio…
The mechanics and physics of twisted and coiled polymer actuators
Qiong Wang, Anan Ghrayeb, SeongHyeon Kim +2
Twisted and coiled polymer actuators (TCPAs) generate large contractile mechanical work mimicking natural muscles, which makes them suitable for robotics and health-assistive devic…
Transient amplification of broken symmetry in elastic snap-through
Qiong Wang, Andrea Giudici, Weicheng Huang +4
A snap-through bifurcation occurs when a bistable structure loses one of its stable states and moves rapidly to the remaining state. For example, a buckled arch with symmetrically…
Buckling-induced transmission switching in phononic waveguides in the presence of disorder
Ali Kanj, Alexander F. Vakakis, Sameh Tawfick
On-chip phononic circuits tailor the transmission of elastic waves, which can couple to electronic and photonic systems, enabling new signal manipulation capabilities. Phononic cir…
Ultra-tuning of nonlinear drumhead MEMS resonators by electro-thermoelastic buckling
Ali Kanj, Paolo F. Ferrari, Arend M. van der Zande +2
Nonlinear micro-electro-mechanical systems (MEMS) resonators open new opportunities in sensing and signal manipulation compared to their linear counterparts by enabling frequency t…
Frequency Response and Eddy Current Power Loss in Magneto-Mechanical Transmitters
Jiheng Jing, Sameh Tawfick, Gaurav Bahl
Magneto-mechanical transmitters offer a compact and low-power solution for the generation of ultra-low frequency (ULF) magnetic signals for through-ground and through-seawater comm…
Swelling, Softening and Elastocapillary Adhesion of Cooked Pasta
Jonghyun Hwang, Jonghyun Ha, Ryan Siu +2
The diverse chemical and physical reactions encountered during cooking connect us to science every day. Here, we theoretically and experimentally investigate the swelling and softe…
Design, Dynamics, and Dissipation of a Torsional-Magnetic Spring Mechanism
Ali Kanj, Rhinithaa P. Thanalakshme, Chengzhang Li +3
We present an analytical and experimental study of torsional magnetic mechanism where the restoring torque is due to magnetic field interactions between rotating and fixed permanen…
Magneto-Mechanical Transmitters for Ultra-Low Frequency Near-field Communication
Rhinithaa P. Thanalakshme, Ali Kanj, JunHwan Kim +6
Electromagnetic signals in the ultra-low frequency (ULF) range below 3 kHz are well suited for underwater and underground wireless communication thanks to low signal attenuation an…
Twist Coupled Kirigami Cellular Metamaterials and Mechanisms
Nigamaa Nayakanti, Sameh H. Tawfick, A. John Hart
Manipulation of thin sheets by folding and cutting offers opportunity to engineer structures with novel mechanical properties, and to prescribe complex force-displacement relations…
Multi-shape memory by dynamic elastocapillary self-assembly
Dongwoo Shin, Sameh Tawfick
Inspired by the synchronized beating of cilia, we show that the collective dynamics of hair-like fibers in a meniscus during fast drainage enables their self-organization into mult…
Mechanisms for impulsive energy dissipation and small scale effects in micro-granular media
Jonathan Bunyan, Alexander F. Vakakis, Sameh Tawfick
We study impulse response in 1-D homogeneous micro-granular chains on a linear elastic substrate. Micro-granular interactions are analytically described by the Schwarz contact mode…
Fabrication and electrical integration of robust carbon nanotube micropillars by self-directed elastocapillary densification
Michael De Volder, Sei Jin Park, Sameh H. Tawfick +2
Vertically-aligned carbon nanotube (CNT) "forest" microstructures fabricated by chemical vapor deposition (CVD) using patterned catalyst films typically have a low CNT density per…