Πλοήγηση ανά Θέμα "Friction"
Αποτελέσματα 1-17 από 17
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Darcy-Weisbach friction factor at the nanoscale: From atomistic calculations to continuum models
(2017)Amodification of the Darcy-Weisbach friction factor applicable to nanoscale liquid transport processes is proposed. Non-equilibrium molecular dynamics simulations allowus to access the atomic behaviour of liquids moving ... -
Dependence of friction coefficient on the resolution and fractal dimension of metallic fracture surfaces
(2013)The paper studies the friction mechanism that is developed between metallic fracture interfaces of fractal geometry. The main purpose of the paper is to investigate how both the resolution and the fractal dimension of the ... -
Dependence of friction coefficient on the resolution of asperities in metallic rough surfaces under cyclic loading
(2017)In this paper the friction mechanism that is developed between metallic rough interfaces with irregularities of different scales, submitted to cyclic loading is studied. The main purpose of the paper is to investigate how ... -
EFFECTS of MULTI-SCALE STRUCTURE and FRACTAL DIMENSION on the FRICTION MECHANISM in ROUGH SURFACES under HORIZONTAL DYNAMIC EXCITATION
(2019)Tribological information obtained for contacts with multiple-asperity interaction is a challenging task. In this work, the friction mechanism that is developed between rough interfaces with asperities of different geometry ... -
Fatigue crack growth prediction in 2xxx AA with friction stir weld HAZ properties
(2016)An analytical model is developed to predict fatigue crack propagation rate under mode I loading in 2024 aluminum alloy with FSW HAZ material characteristics. Simulation of the HAZ local properties in parent 2024 AA was ... -
Friction factor in nanochannel flows
(2016)Non-equilibrium molecular dynamics simulations are employed in order to access the detailed atomic behavior of fluids moving in nanochannels and to quantify the associated energy dissipation. Nanochannels of various degrees ... -
The friction factor of a rarefied gas flow in a circular tube
(2007)An expression for the estimation of the Poiseuille number for internal rarefied flows is developed. The derived formula is given in terms of dimensionless quantities, which are obtained by the solution of the flow based ... -
Friction Stir Welding Optimization of 3D-Printed Acrylonitrile Butadiene Styrene in Hybrid Additive Manufacturing
(2022)The feasibility of joining material extrusion (MEX) 3D-printed acrylonitrile butadiene styrene (ABS) plates with the friction stir welding (FSW) process was investigated herein as a promising topic of hybrid additive ... -
Material extrusion 3D printing and friction stir welding: an insight into the weldability of polylactic acid plates based on a full factorial design
(2022)In this work, material extrusion (MEX) 3D-printed polylactic acid (PLA) thin workpieces were joined via the friction stir welding (FSW) process to evaluate the feasibility and the key features of the process. To ensure the ... -
Phase-Field Modeling of Nugget Zone for a AZ31-Mg-Alloy Friction Stir Weld
(2018)This work presents simulation of microstructure evolution in the nugget zone (NZ) of a AZ31-Mg-alloy friction stir weld. The process parameters (tool geometrical characteristics, rotational speed, travel speed, applied ... -
Rolling contact fatigue cracking in rails subjected to in-service loading
(2016)Rolling contact fatigue (RCF) is one of the most important failure mechanisms in rails with significant cost- and safety-related implications on the operation of railway systems. In this work, a metallurgical analysis of ... -
Rolling contact fatigue of rails
(2013)Rolling contact fatigue (RCF) has been of increasing concern in the recent years regarding the safe operation of high-speed railway track with high traffic intensity. The present paper summarizes the results of an on-going ... -
Seismic strength evaluation of reinforced concrete shear walls with cracks, using the notion of fractal geometry
(2011)Shear walls play an important role to the seismic strength of modern seismic resistant structures. They are designed so that they have significant bending and shear strengths and ductility. However, existing structures ... -
Squealing noise abatement techniques in athens tram network
(2010)This article presents various operating systems, developed and implemented at the Athens Tram network to reduce the airborne noise emitted in the sharp curves of the tramway. From the first days of the network's operation ... -
Surface anisotropy for monitoring the wear of IC engine cylinders
(2004)The present work proposes a methodology for monitoring the wear of internal combustion engine cylinders. This could be useful in calculating the time at which maintenance should be done on such a tribosystem or in determining ... -
Tribological coatings for aerospace applications and the case of WC-Co plasma spray coatings
(2009)Friction and wear requirements in aerospace systems are dictated by life limiting problems. One challenge is the broad range of contact stresses and sliding speeds for various movable devices. Another challenge is the ... -
Visualization of the Rolling Contact Fatigue Cracks in Rail Tracks with a Magnetooptical Sensor
(2019)The rolling contact fatigue cracks (RCF), produced at the surface of the rail tracks, can be detected using a magnetooptical (MO) sensor. Rail tracks are carbon steels with pearlite microstructure. This microstructure has ...