Cyclic extrusion of a lava dome based on a stick-slip mechanism

2012 ◽  
Vol 337-338 ◽  
pp. 39-46 ◽  
Author(s):  
A. Costa ◽  
G. Wadge ◽  
O. Melnik
Keyword(s):  
Lava Dome ◽  
Stick Slip ◽  
Slip Mechanism

Comment on: Cyclic extrusion of a lava dome based on a stick-slip mechanism, by Costa et al. (2012)

2017 ◽  
Vol 459 ◽  
pp. 417-419 ◽  
Author(s):  
D.V. Alexandrov ◽  
I.A. Bashkirtseva ◽  
L.B. Ryashko
Keyword(s):  
Lava Dome ◽  
Stick Slip ◽  
Slip Mechanism

Hysteresis Identification of Carbon Nanotube Composite Beams

2018 ◽  
Author(s):  
Michela Taló ◽  
Walter Lacarbonara ◽  
Giovanni Formica ◽  
Giulia Lanzara
Keyword(s):  
Phenomenological Model ◽  
Differential Evolution Algorithm ◽  
Hysteresis Loops ◽  
Hysteretic Behavior ◽  
Damping Capacity ◽  
Stick Slip ◽  
Slip Mechanism ◽  
Material Optimization ◽  
Constitutive Parameters ◽  
Mean Square Errors

Nanocomposites made of a hosting polymer matrix integrated with carbon nanotubes as nanofillers exhibit an inherent hysteretic behavior arising from the CNT/matrix frictional sliding. Such stick-slip mechanism is responsible for the high damping capacity of CNT nanocomposites. A full 3D nonlinear constitutive model, framed in the context of the Eshelby-Mori-Tanaka theory, reduced to a 1D phenomenological model is shown to describe accurately the CNT/polymer stick-slip hysteresis. The nonlinear hysteretic response of CNT nanocomposite beams is experimentally characterized via displacement-driven tests in bending mode. The force-displacement cycles are identified via the phenomenological model featuring five independent constitutive parameters. A preliminary parametric study highlights the importance of some key parameters in determining the shape of the hysteresis loops. The parameter identification is performed via one of the variants of a genetic-type differential evolution algorithm. The nanocomposites hysteresis loops are identified with reasonably low mean square errors. Such outcome confirms that the 1D phenomenological model may serve as an effective tool to describe and predict the nanocomposite nonlinear hysteretic behavior towards unprecedented material optimization and design.

Stick-slip mechanism in a granular medium

2010 ◽  
Vol 46 (6) ◽  
pp. 600-605 ◽  
Author(s):  
A. P. Bobryakov
Keyword(s):  
Granular Medium ◽  
Stick Slip ◽  
Slip Mechanism

scholarly journals Effect of Nitrogen Implantation on Metal Transfer during Sliding Wear under Ambient Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Luke Autry ◽  
Harris Marcus
Keyword(s):  
Wear Mechanism ◽  
Heat Treating ◽  
Metal Transfer ◽  
Interstitial Free ◽  
Volumetric Wear ◽  
Ambient Conditions ◽  
Nitrogen Implantation ◽  
Stick Slip ◽  
Near Surface ◽  
Slip Mechanism

Nitrogen implantation in Interstitial-Free steel was evaluated for its impact on metal transfer and 1100 Al rider wear. It was determined that nitrogen implantation reduced metal transfer in a trend that increased with dose; the Archard wear coefficient reductions of two orders of magnitude were achieved using a dose of 2e17 ions/cm2, 100 kV. Cold-rolling the steel and making volumetric wear measurements of the Al-rider determined that the hardness of the harder material had little impact on volumetric wear or friction. Nitrogen implantation had chemically affected the tribological process studied in two ways: directly reducing the rider wear and reducing the fraction of rider wear that ended up sticking to the ISF steel surface. The structure of the nitrogen in the ISF steel did not affect the tribological behavior because no differences in friction/wear measurements were detected after postimplantation heat treating to decompose the as-implantedε-Fe3N toγ-Fe4N. The fraction of rider-wear sticking to the steel depended primarily on the near-surface nitrogen content. Covariance analysis of the debris oxygen and nitrogen contents indicated that nitrogen implantation enhanced the tribo-oxidation process with reference to the unimplanted material. As a result, the reduction in metal transfer was likely related to the observed tribo-oxidation in addition to the introduction of nitride wear elements into the debris. The primary Al rider wear mechanism was stick-slip, and implantation reduced the friction and friction noise associated with that wear mechanism. Calculations based on the Tabor junction growth formula indicate that the mitigation of the stick-slip mechanism resulted from a reduced adhesive strength at the interface during the sticking phase.

Application Research of Stick-Slip Mechanism on MW Wind Turbine Yaw System

2012 ◽  
Vol 220-223 ◽  
pp. 463-468
Author(s):  
Xiao Guang Li ◽  
Ping Zhao ◽  
Jie Zhong
Keyword(s):  
Wind Turbine ◽  
Damping Ratio ◽  
Kinematic Model ◽  
Torsional Stiffness ◽  
Application Research ◽  
Stick Slip ◽  
Rotating Speed ◽  
Slip Mechanism ◽  
Simulation Calculation ◽  
Stick Slip Motion

The “stick-slip” motion or creep phenomenon is often observed in MW wind turbine yaw system. Yam system stick-slip coupling phenomenon was analyzed, and stick-slip coupling kinematic model was established and simulated by Simulink. The influence of torsional stiffness, friction coefficient difference, rotating speed, damping ratio and tightening torque on system was researched. Main measures for elimination of stick-slip coupling phenomenon were given through theoretical analysis and simulation calculation.

Design of a precise linear-rotary positioning stage for optical focusing based on the stick-slip mechanism

2022 ◽  
Vol 165 ◽  
pp. 108398
Author(s):  
Qingbing Chang ◽  
Yingxiang Liu ◽  
Jie Deng ◽  
Shijing Zhang ◽  
Weishan Chen
Keyword(s):  
Stick Slip ◽  
Slip Mechanism ◽  
Positioning Stage ◽  
Optical Focusing

Modeling and Simulation of Stick-Slip Motion for Pneumatic Cylinder Based on Meter-In Circuit

2011 ◽  
Vol 130-134 ◽  
pp. 775-780 ◽  
Author(s):  
Peng Fei Qian ◽  
Guo Liang Tao ◽  
Jian Feng Chen ◽  
Bo Lu
Keyword(s):  
Mathematical Model ◽  
Pneumatic Cylinder ◽  
Practical Application ◽  
Stick Slip ◽  
Slip Mechanism ◽  
Runge Kutta Method ◽  
Variable Step ◽  
Order Variable ◽  
Stick Slip Motion ◽  
Slip Motion

For the stick-slip phenomenon encountered in the pneumatic cylinder motion in practical application, the stick-slip mechanism was analyzed and an nonlinear mathematical model based on the improved LuGre model of pneumatic cylinder movement was established. The movement of the piston and the pressure of the rodless chamber in the pneumatic cylinder based on meter-in circuit were obtained through solving the differential equations by four-order variable-step Runge-Kutta method. The comparison between simulation and experimental results shows that the established mathematical model can describe the stick-slip motion of pneumatic cylinder with a relatively good accuracy.

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