scholarly journals Development and characterization of a novel piezoelectric-driven stick-slip actuator with anisotropic-friction surfaces

2011 ◽  
Vol 61 (9-12) ◽  
pp. 1029-1034 ◽  
Author(s):  
Q. S. Zhang ◽  
X. B. Chen ◽  
Q. Yang ◽  
W. J. Zhang
Keyword(s):  
Stick Slip ◽  
Anisotropic Friction ◽  
Friction Surfaces

Origin and Characterization of Different Stick−Slip Friction Mechanisms†

Langmuir ◽  
1996 ◽  
Vol 12 (19) ◽  
pp. 4559-4563 ◽  
Author(s):  
Alan D. Berman ◽  
William A. Ducker ◽  
Jacob N. Israelachvili
Keyword(s):  
Friction Mechanisms ◽  
Stick Slip

Characterization of Cast Iron Friction Surfaces

1972 ◽  
Author(s):  
S. K. Rhee ◽  
R. T. Ducharme ◽  
W. M. Spurgeon
Keyword(s):  
Cast Iron ◽  
Friction Surfaces

scholarly journals Use of biomimetic hexagonal surface texture in friction against lubricated skin

2014 ◽  
Vol 11 (94) ◽  
pp. 20140113 ◽  
Author(s):  
Alexey Tsipenyuk ◽  
Michael Varenberg
Keyword(s):  
Contact Area ◽  
Surface Texture ◽  
Fluid Secretion ◽  
Geometrical Parameters ◽  
Stick Slip ◽  
Drainage Rate ◽  
Smooth Contact ◽  
Surface Patterns ◽  
Different Shapes ◽  
Friction Surfaces

Smooth contact pads that evolved in insects, amphibians and mammals to enhance the attachment abilities of the animals' feet are often dressed with surface micropatterns of different shapes that act in the presence of a fluid secretion. One of the most striking surface patterns observed in contact pads of these animals is based on a hexagonal texture, which is recognized as a friction-oriented feature capable of suppressing both stick–slip and hydroplaning while enabling friction tuning. Here, we compare this design of natural friction surfaces to textures developed for working in similar conditions in disposable safety razors. When slid against lubricated human skin, the hexagonal surface texture is capable of generating about twice the friction of its technical competitors, which is related to it being much more effective at channelling of the lubricant fluid out of the contact zone. The draining channel shape and contact area fraction are found to be the most important geometrical parameters governing the fluid drainage rate.

Empirical Characterization of friction parameters for Nonlinear Stick-slip Simulation to Predict the Severity of Squeak Sounds

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Mohsen Bayani ◽  
Arian Nasseri ◽  
Vince Heszler ◽  
Casper Wickman ◽  
Rikards Söderberg
Keyword(s):  
Stick Slip ◽  
Friction Parameters

Modeling of a Flexible Instrument to Study its Sliding Behavior Inside a Curved Endoscope

2012 ◽  
Vol 8 (3) ◽  
Author(s):  
Jitendra P. Khatait ◽  
Dannis M. Brouwer ◽  
Ronald G. K. M. Aarts ◽  
Just L. Herder
Keyword(s):  
Static Friction ◽  
Surgical Instrument ◽  
Bending Rigidity ◽  
Stick Slip ◽  
Multibody Modeling ◽  
Beam Elements ◽  
Flexible Instrument ◽  
The Coefficient Of Friction ◽  
Flexible Instruments

Flexible instruments are increasingly used to carry out surgical procedures. The instrument tip is remotely controlled by the surgeon. The flexibility of the instrument and the friction inside the curved endoscope jeopardize the control of the instrument tip. Characterization of the surgical instrument behavior enables the control of the tip motion. A flexible multibody modeling approach was used to study the sliding behavior of the instrument inside a curved endoscope. The surgical instrument was modeled as a series of interconnected planar beam elements. The curved endoscope was modeled as a rigid curved tube. A static friction-based contact model was implemented. The simulations were carried out both for the insertion of the flexible instrument and for fine manipulation. A computer program (SPACAR) was used for the modeling and simulation. The simulation result shows the stick-slip behavior and the motion hysteresis because of the friction. The coefficient of friction has a large influence on the motion hysteresis, whereas the bending rigidity of the instrument has little influence.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

Sign in / Sign up

Export Citation Format

Share Document