Helical buckling of actin inside filopodia generates traction [PDF]
Proceedings of the National Academy of Sciences of the United States of America, 2015 Significance Filopodia are essential membrane protrusions that facilitate cellular sensing and interaction with the environment. The mechanical properties of filopodia are crucial for their ability to push and pull on external objects and are attributed to actin dynamics.
Poul Martin Bendix +2 more
exaly +6 more sources
The Effects of Boundary Conditions and Friction on the Helical Buckling of Coiled Tubing in an Inclined Wellbore. [PDF]
PLoS ONE, 2016 Analytical buckling models are important for down-hole operations to ensure the structural integrity of the drill string. A literature survey shows that most published analytical buckling models do not address the effects of inclination angle, boundary ...
Yinchun Gong +3 more
doaj +2 more sources
Helical Buckling of Drill-Strings [PDF]
MATEC Web of Conferences, 2018 This paper presents experimental and numerical investigations of the complex drill-string vibration, with particular attention to the helical buckling of drill-strings and its influence on the system dynamics.
Kapitaniak Marcin +2 more
doaj +3 more sources
Computational simulations of the helical buckling behavior of blood vessels. [PDF]
Int J Numer Method Biomed Eng, 2019 AbstractTortuous vessels are often observed in vivo and could hinder or even disrupt blood flow to distal organs. Besides genetic and biological factors, the in vivo mechanical loading seems to play a role in the formation of tortuous vessels, but the mechanism for formation of helical vessel shape remains unclear.
Sharzehee M, Fatemifar F, Han HC.
europepmc +4 more sources
Helical buckling of thin rods: FE modelling [PDF]
MATEC Web of Conferences, 2018 In this paper, we utilize the Finite Element (FE) method to model twisting of long thin rods and capture the bifurcation scenarios leading to heli- cal buckling and various further post-buckling states.
Kapitaniak Marcin +2 more
doaj +3 more sources
Analysis of sinusoidal post-buckling deformation of horizontal coiled tubing with initial residual bending. [PDF]
PLoS ONEIn the process of horizontal well construction, the working environment in the well is very complicated. It is difficult to determine the actual deformation and force of the coiled tubing in the wellbore from the load change at the wellhead along.
Zhuang Li +3 more
doaj +2 more sources
Inter-helical and intra-helical buckling analyses of tubular strings with connectors in horizontal wellbores [PDF]
Journal of Petroleum Science and Engineering, 2017 Abstract Helical buckling of tubular strings with connectors is divided into two sub-problems: inter-helical buckling and intra-helical buckling. The suspended section of the tubular string is depicted by beam-column model and the continuous contact section is depicted by helix.
Wenjun Huang
exaly +2 more sources
Magnetically controlled microrobotic system for programmable stiffness tuning and active steering of microcatheters [PDF]
Nature CommunicationsSurgical tasks in small tortuous lumens demand interventional instruments with controllable mechanical adaptability. However, current microcatheters lack a non-disruptive, integration-ready strategy for dynamic stiffness tuning—critical for meeting the ...
Yuan Liu +7 more
doaj +2 more sources
The ancient and helical architecture of Elasmobranchii's spermatozoa enables progressive motility in viscous environments. [PDF]
PLoS ONESubclass Elasmobranchii belongs to an old evolutionary class of Chondrichthyes that diverged 450 mya, presenting a wide diversity of reproductive strategies while preserving the ancient mode of internal fertilization.
Sergii Boryshpolets +6 more
doaj +2 more sources
Analysis of Torsional Response in Pneumatic Artificial Muscles [PDF]
BiomimeticsPneumatic artificial muscles (PAMs) consist of an elastomeric bladder wrapped in a helical braid. When inflated, PAMs expand radially and contract axially, producing large axial forces.
Frank C. Cianciarulo +2 more
doaj +2 more sources