Article
Materials Science, Multidisciplinary
Hiroaki Miyoshi, Seishiro Matsubara, Dai Okumura
Summary: The study investigates the bifurcation and deformation of periodic patterns on a gel film bonded to a soft substrate using 3D finite element analysis. The research discovers that the occurrence of rectangular checkerboard modes at the second bifurcation is the missing link in the pattern evolution from hexagonal dimples to herringbone and labyrinth patterns. The resulting deformation patterns are in good agreement with experiments and show similarities to in-plane buckling behavior of hexagonal honeycombs.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Shotaro Kikuchi, Seishiro Matsubara, So Nagashima, Dai Okumura
Summary: In this study, the diversity of bifurcations and deformations in periodic patterns on compressed films bonded to compliant substrates is investigated. It is found that different bifurcation modes lead to a family of herringbone deformation patterns with different dimensions, indicating a multiple and robust evolutionary process.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Engineering, Civil
Christoph Adam, Ivan Paulmichl, Thomas Furtmueller
Summary: In this paper, stability-prone circular shallow arches composed of three symmetrically arranged flexibly bonded layers with fixed and hinged supports at both ends are examined. Analytical expressions for the limit points and bifurcation points are derived based on the differential equations of equilibrium and a series expansion of the governing kinematic variables. The accuracy of these analytical expressions is shown to be high compared to the results of complex numerical analyses.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Mechanics
Weicheng Huang, Chao Ma, Longhui Qin
Summary: Based on the geometrically nonlinear Kirchhoff rod theory, snap-through behaviors of an asymmetrically clamped ribbon under midpoint loadings are explored through a numerical approach. Multiple different snap-through processes are observed for the elastic ribbons in a 3D scenario, which provides a fundamental understanding of structural mechanics and motivates the designs and applications of engineered systems.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Mechanics
A. Derya Bakiler, Berkin Dortdivanlioglu, Ali Javili
Summary: Instabilities in compressible elastic domains under plane deformations have not been studied as extensively as incompressible cases. This research offers a unified approach for analyzing instabilities in compressible elastic domains, specifically in beams, half-spaces, and bilayers. The analytical framework provides a basis for further research on instabilities in other modes and complex geometries.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Masato Tanaka, Fumio Fujii
Summary: The paper presents a practical diagnosis for visualizing all secondary paths branching from the compound stability point in nonlinear structures with multiple bifurcation issues. The proposed asymptotic theory can reliably diagnose complex stability problems.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Amit Nagarkar, Won-Kyu Lee, Daniel J. Preston, Markus P. Nemitz, Nan-Nan Deng, George M. Whitesides, L. Mahadevan
Summary: The experiment demonstrates how symmetry-breaking action in space-time can lead to locomotion of a thin circular sheet, allowing it to walk on land and swim in water. The shape asymmetry of the sheet in different modes of locomotion leads to asymmetric interactions with the environment, resulting in different modes of movement.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Mechanics
Morten Brons
Summary: Sierra et al. conducted a complete bifurcation analysis of the flow around a rotating circular cylinder, revealing a complex pattern of periodic solutions and multiple steady states within a parameter regime. Surprisingly, the dynamics of the singular system itself cannot be realized as a specific flow, but acts mathematically as an organizer of the physical bifurcation diagram.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Mechanical
Xianheng Guan, Likhitha Reddipalli, Dylan T. Butler, Qihan Liu, Sachin S. Velankar
Summary: This study experimentally demonstrates that a viscoelastic liquid exhibits a creasing instability similar to that of elastic materials, but with strain dependence on the rate of compression. The researchers developed a model to describe the creasing behavior of viscoelastic liquids and validated it through experiments.
EXTREME MECHANICS LETTERS
(2022)
Article
Engineering, Mechanical
Filipe Fontanela, Alessandra Vizzaccaro, Jeanne Auvray, Bjoern Niedergesaess, Aurelien Grolet, Loic Salles, Norbert Hoffmann
Summary: The study demonstrates nonlinear vibration localization in a system of two symmetric weakly coupled nonlinear oscillators, with bifurcations to localized solutions in a two degree-of-freedom model with piecewise linear stiffness. Experimental investigation using two weakly coupled beams against stoppers for large vibration amplitudes confirms the nonlinear localization.
NONLINEAR DYNAMICS
(2021)
Article
Mechanics
Masato Nagata, Baofang Song, Darren P. Wall
Summary: The study reveals the presence of tilted-vortex flow and periodic-vortex flow at the onset of instability in rotating plane Couette flow, challenging the previously established understanding of bifurcations at the transition from laminar to turbulent flow.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Gergely Buza, Miguel Beneitez, Jacob Page, Rich R. Kerswell
Summary: Using branch continuation in the FENE-P model, this study shows that finite-amplitude travelling waves arising from the linear instability of viscoelastic channel flow are substantially subcritical, indicating susceptibility to nonlinear instability triggered by small finite-amplitude disturbances. The results indicate that these travelling waves exist more generally in parameter space than their spawning neutral curve and can influence dynamics far from where the flow is linearly unstable, either directly or indirectly through their instabilities.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Multidisciplinary Sciences
M. Curatolo, G. Napoli, P. Nardinocchi, S. Turzi
Summary: The study describes and investigates an active elastic instability occurring in a swollen spherical closed shell during a dehydration process. Numerical experiments based on a stress-diffusion model and a semi-analytical model are established to understand the phenomenon. The semi-analytic model matches the outcomes of the numerical experiments and discusses the ranges of validity of the approximated analytical model.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Chemistry, Physical
Sangmin Lim, Achyuta Yadunandan, M. Khalid Jawed
Summary: We present a bacteria-inspired centimeter-scale soft robotic hardware platform and a computational framework to simulate the multi-flagellated robot's motion under low Reynolds number. Comparison between experimental and simulation results confirms that the simulation tool accurately captures the essential physics of the problem.
Article
Mechanics
Yufei Wang, Zhiying Wang, Yan Du, Jingzhu Wang, Yiwei Wang, Chenguang Huang
Summary: This study investigates the dynamics of the surface-seal splash and develops an analytical model to understand its mechanics. The results indicate that the aerodynamic pressure plays a dominant role in the formation of the surface-seal splash.
Article
Sport Sciences
Matthew S. J. Tredrea, Kane J. Middleton, Matthew N. Bourne, David L. Carey, Aaron T. Scanlan, Ben J. Dascombe
Summary: This study compared the kinetics, kinematics, and performance of countermovement jumps (CMJs) under two different loading conditions (centralized or peripheral). The results showed that the loading condition did not significantly affect the kinetic and kinematic variables. However, increasing load significantly affected jump height, force, velocity, and acceleration variables.
JOURNAL OF STRENGTH AND CONDITIONING RESEARCH
(2022)
Article
Orthopedics
Andrea B. Mosler, David L. Carey, Kristian Thorborg, Adam Weir, Cristiano Eirale, Nicol van Dyk, Per Holmich, Rod J. Whiteley, Tim J. Gabbett, Kay M. Crossley
Summary: This study aims to investigate the relationship between training/match-play duration and time-loss groin injury in professional male soccer players, and determine whether previously identified intrinsic risk factors influenced this relationship.
JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY
(2022)
Article
Sport Sciences
Tim Massard, David L. Carey, Matt Whalan, John A. Sampson, Billy T. Hulin, Ric Lovell
Summary: The study found that individual speed zones based on fitness characteristics had minimal impact on the association between non-contact injury and acute and chronic HSR loads in semi-professional soccer players. However, uncertainty in the effects of extreme values of HSR loads hindered conclusive findings.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Sport Sciences
Rebecca J. Peek, David L. Carey, Kane J. Middleton, Paul B. Gastin, Anthea C. Clarke
Summary: The aim of this study was to understand the association between impact and movement characteristics during whole game and peak 1- to 10-minute rolling windows in professional rugby union. The study found a positive association between whole-game running and impacts, where greater impact characteristics corresponded with greater running characteristics. It also highlighted the need to train for both running and impact characteristics in rugby union.
JOURNAL OF STRENGTH AND CONDITIONING RESEARCH
(2023)
Article
Chemistry, Physical
Wathsala M. A. Jayawardana, Yangchao Liao, Zhaofan Li, Wenjie Xia, Andrew B. B. Croll
Summary: When a thin sheet is crumpled into a smaller volume, it forms a complex state known as crumpled matter, which exhibits high resistance to compression despite its light weight. This study explores how cutting the sheet affects its behavior in the crumpled state. The findings show that cutting does not significantly change the overall compressive behavior, but it does alter the distribution of curvature in the crumpled sheets.
Article
Polymer Science
Mike E. Dwyer, Rae M. Robertson-Anderson, Bekele J. Gurmessa
Summary: Actin maintains the stability and motility of biological cells. This study investigates the impact of actin-binding proteins on the mechanical properties of actin networks. It is found that crosslinking and stabilization can synergistically or antagonistically affect the network's resistance to strain. The study also reveals that stabilization can switch the initial force response from stress stiffening to softening. These findings shed light on the diverse mechanical properties of the cytoskeleton and bio-inspired materials.
Article
Materials Science, Multidisciplinary
Daniel Angel Bellido-Aguilar, Maryam Safaripour, Kurt VanDonselaar, Leo-Stanley Chibuike Ndunagum, Dean C. Webster, Andrew B. Croll
Summary: Ice accretion poses a threat to outdoor infrastructure and vehicles at low temperatures and it is difficult to avoid. The use of anti-icing coatings, particularly silicone elastomers, has become popular due to their hydrophobicity, ease of preparation, and low cost. However, the characterization of these coatings is often done using unproven techniques that do not directly relate to their properties. This study investigates the adhesion between glass and ice as well as four PDMS-based elastomers using a combination of shear tests and microscale techniques, revealing differences in energy release rates and interfacial crack dynamics between different interfaces.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yangchao Liao, Zhaofan Li, Long Chen, Andrew B. Croll, Wenjie Xia
Summary: Research has shown that Stone-Wales defects have a strong influence on the crumpling behavior of graphene sheets, affecting their size scaling laws and weakening their self-adhesion. Additionally, these defects lead to enhanced mechanical heterogeneity and a glass-like amorphous state in crumpled graphene.
Article
Chemistry, Analytical
Daylon Seakins, Paul B. Gastin, Karl Jackson, Matthew Gloster, Aaron Brougham, David L. Carey
Summary: This study used player location data from the 2021 Australian Football League season to describe the spatial characteristics and roles of players in the forward line. Results showed that teams differed in the dispersion of their forward players, but were similar in terms of player locations' centroids. Cluster analysis and visual inspection revealed the presence of different repeated structures or formations used by teams. Teams also showed variation in their choice of player role combinations in forward lines. The study proposed new terminology to describe the characteristics of forward line formations in professional Australian Football.
Article
Medicine, General & Internal
Danilo De Oliveira Silva, Richard T. R. Johnston, Benjamin F. Mentiplay, Melissa J. Haberfield, Adam G. Culvenor, Andrea M. Bruder, Adam Semciw, Michael Girdwood, Paula J. Pappalardo, Connie Briggs, Thomas J. West, Joshua P. Hill, Brooke E. Patterson, Christian J. Barton, Prasanna Sritharan, James L. Alexander, David L. Carey, Anthony G. Schache, Richard B. Souza, Valentina Pedoia, Edwin H. Oei, Stuart J. Warden, Gustavo F. Telles, Matthew G. King, Michael P. Hedger, Mark Hulett, Kay M. Crossley
Summary: This study aims to compare knee joint health and symptoms between runners with and without a history of knee surgery through MRI examination. It also aims to explore the relationships between training load and running biomechanics with changes in knee joint structure and symptoms.
Article
Sport Sciences
Rebecca J. Peek, David L. Carey, Kane J. Middleton, Paul B. Gastin, Anthea C. Clarke
Summary: The purpose of this study was to compare the peak periods for different training methods in elite male rugby union players. The findings suggest that small-sided games (SSG) drills produce the greatest peak movement characteristics, while the ability to replicate peak impact characteristics is questionable. The distribution of training time varies across different training methods, with a majority of training performed at moderate intensity levels.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Chemistry, Physical
Kurt R. Vandonselaar, Daniel A. Bellido-Aguilar, Maryam Safaripour, Hyemin Kim, James J. Watkins, Alfred J. Crosby, Dean C. Webster, Andrew B. Croll
Summary: This study investigates the differences in adhesion strength among different siloxane elastomers through experimental testing and characterization analysis. The results show that the variation at low speeds is related to elastomer architecture, while the speed dependence itself is independent of architecture. The study also attempts to directly compare the modulus and adhesion of the materials using an existing model, but the approximations used in the model are found to be inaccurate.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Theresa Elder, Andrew B. Croll
Summary: This study demonstrates a simple and roughness tolerant adhesive system by crumpling thin polymer sheets into a spherical shape. Experimental results show that sticky crumples perform better on long wavelength roughness, and coating a glassy polymer polycarbonate sheet with adhesive improves the peak pull-off forces.
Article
Materials Science, Multidisciplinary
Andrew B. Croll, Yangchao Liao, Zhaofan Li, Wathsala M. A. Jayawardana, Theresa Elder, Wenjie Xia
Summary: This study examines the effects of surface/surface interactions on the compressive strength of a crumpled polymer film. The results show that adhesion increases the compressive strength and the work done during compression cycle is directly influenced by the magnitude of adhesive strength. Furthermore, a new length scale is proposed to characterize the transition between sticky and nonsticky crumpled matter.
Correction
Sport Sciences
B. Mentiplay, de Oliveira Silva, K. Crossley, A. Culvenor, M. Haberfield, T. West, D. Carey, C. Bonello, M. King, M. Hedger, P. Pappalardo, R. Johnston
JOURNAL OF SCIENCE AND MEDICINE IN SPORT
(2022)
