scholarly journals Modeling and Simulation of Non-Uniform Electrolytic Machining Based on Cellular Automata

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1694
Author(s):  
Hongyu Wei ◽  
Zhongning Guo ◽  
Zhiyu Ma
Keyword(s):  
Lattice Gas ◽  
Electrochemical Machining ◽  
Corrosion Products ◽  
Cylindrical Shape ◽  
Cellular Space ◽  
Rapid Dissolution ◽  
Porous Microstructure ◽  
Mesoscopic Level ◽  
Experimental Findings ◽  
And Diffusion

Porous microstructure is a common surface morphology that is widely used in antifouling, drag reduction, adsorption, and other applications. In this paper, the lattice gas automata (LGA) method was used to simulate the non-uniform electrochemical machining of porous structure at the mesoscopic level. In a cellular space, the metal and the electrolyte were separated into orderly grids, the migration of corrosive particles was determined by an electric field, and the influences of the concentration gradient and corrosion products were considered. It was found that different pore morphologies were formed due to the competition between dissolution and diffusion. When the voltage was low, diffusion was sufficient, and no deposit was formed at the bottom of the pore. The pore grew faster along the depth and attained a cylindrical shape with a large depth-to-diameter ratio. As the voltage increased, the dissolution rates in all directions were the same; therefore, the pore became approximately spherical. When the voltage continued to increase, corrosion products were not discharged in time due to the rapid dissolution rate. Consequently, a sedimentary layer was formed at the bottom of the pore and hindered further dissolution. In turn, a disc-shaped pore with secondary pores was formed. The obtained simulation results were verified by experimental findings. This study revealed the causes of different morphologies of pores, which has certain guiding significance for non-uniform electrochemical machining.

scholarly journals Emergent colloidal currents across ordered and disordered landscapes

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Dominik Lips ◽  
Ralph L. Stoop ◽  
Philipp Maass ◽  
Pietro Tierno
Keyword(s):  
Magnetic Particles ◽  
Lattice Gas ◽  
Solvable Model ◽  
Model Systems ◽  
Suitable Model ◽  
Many Body ◽  
Emergent Phenomena ◽  
Density Relationship ◽  
Far From Equilibrium ◽  
Experimental Findings

AbstractMany-particle effects in driven systems far from equilibrium lead to a rich variety of emergent phenomena. Their classification and understanding often require suitable model systems. Here we show that microscopic magnetic particles driven along ordered and defective lattices by a traveling wave potential display a nonlinear current-density relationship, which arises from the interplay of two effects. The first one originates from particle sizes nearly commensurate with the substrate in combination with attractive pair interactions. It governs the colloidal current at small densities and leads to a superlinear increase. We explain such effect by an exactly solvable model of constrained cluster dynamics. The second effect is interpreted to result from a defect-induced breakup of coherent cluster motion, leading to jamming at higher densities. Finally, we demonstrate that a lattice gas model with parallel update is able to capture the experimental findings for this complex many-body system.

Modelling and simulation of ultrasonic-assisted jet electrochemical micro drilling process

2019 ◽  
Vol 233 (12) ◽  
pp. 4199-4212
Author(s):  
Harsha Goel ◽  
Usharani Rath ◽  
Pulak M Pandey
Keyword(s):  
Material Removal ◽  
Removal Rate ◽  
Electrochemical Machining ◽  
Modelling And Simulation ◽  
Drilling Process ◽  
Ultrasonic Assisted ◽  
Micro Holes ◽  
Micro Drilling ◽  
Experimental Findings ◽  
Electrolyte Jet

Ultrasonic-assisted jet electrochemical micro drilling is an advanced variant of electrochemical machining to drill micro holes quickly and efficiently. The present article deals with the modelling and simulation of the integration of ultrasonic vibration with the conventional jet electrochemical micro drilling process. Multi-physics-based modelling and simulation approach has been used in the present work. The flow pattern of electrolyte jet was analysed for both jet electrochemical micro drilling and ultrasonic-assisted jet electrochemical micro drilling processes. The simulation results were validated with the previous experimental findings of ultrasonic-assisted jet electrochemical micro drilling process. It was found that the material removal rate (MRR) improved significantly as the ultrasonic wave got superimposed onto the electrolyte jet. In addition to that, voltage and concentration of the electrolyte also played vital roles in improving the MRR.

scholarly journals Density and Diffusion Anomalies in a Repulsive Lattice Gas

2014 ◽  
Vol 53 ◽  
pp. 7-15 ◽  
Author(s):  
Andressa A. Bertolazzo ◽  
Marcia C. Barbosa
Keyword(s):  
Lattice Gas ◽  
And Diffusion

Thermodynamics and diffusion of a lattice gas on a simple cubic lattice

2001 ◽  
Vol 64 (6) ◽  
Author(s):  
Panos Argyrakis ◽  
Yaroslav G. Groda ◽  
George S. Bokun ◽  
Vyacheslav S. Vikhrenko
Keyword(s):  
Lattice Gas ◽  
Cubic Lattice ◽  
Simple Cubic ◽  
Simple Cubic Lattice ◽  
And Diffusion

scholarly journals Application of µ-Raman spectroscopy to the study of the corrosion products of archaeological coins

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 234
Author(s):  
Tilde De Caro ◽  
Emma Angelini ◽  
Leila Es Sebar
Keyword(s):  
Raman Spectroscopy ◽  
Analytical Techniques ◽  
Corrosion Products ◽  
Lead Chloride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Experimental Findings ◽  
Non Destructive ◽  
Excavation Site

<p>In this paper, a study of the corrosion products formed on archaeological bronze artefacts excavated in Tharros (Sardinia, Italy) is presented. The investigation was carried out by means of the combination of different analytical techniques, including optical microscopy, micro-Raman spectroscopy (µ-RS), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy and X-ray diffraction. The artefacts under study are three bronze coins from the Phoenician–Punic period that are deeply corroded due to the chloride-rich soil of the Tharros excavation site. µ-Raman spectroscopy was chosen to investigate the corroded surfaces of the artefacts because it is a non-destructive technique, it has high spatial resolution, and it makes it possible to discriminate between polymorphs and correlate colour and chemical composition. Through µ-RS, it was possible to identify different mineralogical phases and different polymorphs, such as cuprite (Cu<sub>2</sub>O), copper trihydroxychloride [Cu<sub>2</sub>Cl(OH)<sub>3</sub>] polymorphs, hydroxy lead chloride laurionite [PbCl(OH)] and calcium carbonate polymorph aragonite. The experimental findings highlight that micro-Raman spectroscopy can be used to provide further knowledge regarding the environmental factors that may cause the degradation of archaeological bronzes in soil.</p>

Accelerated Fatigue Tests of BS 080A42 Steel Using the WBE Mission Loadings

2006 ◽  
Vol 326-328 ◽  
pp. 1023-1026
Author(s):  
Shahrum Abdullah ◽  
Ahmad Kamal Ariffin
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Smooth Surface ◽  
Fatigue Tests ◽  
Gauge Length ◽  
Cylindrical Shape ◽  
Variable Amplitude ◽  
Damage Models ◽  
Pave Road ◽  
Experimental Findings

This paper describes the laboratory accelerated fatigue tests of BS 080A42 steel using the shortened variable amplitude (VA) loading produced by the Wavelet Bump Extraction (WBE) algorithm. In this study, a VA strain loading which was measured on the lower suspension arm of a vehicle while driven over a pavé road surface was used. The WBE shortened loading was validated based on the fatigue life comparison to the original loading using four strain-life fatigue damage models. Experimental fatigue tests were performed using a cylindrical shape specimen with the 6- mm gauge length smooth surface made from BS 080A42 steel. The experimental findings showed that the fatigue tests were accelerated from 78.8 hours to 32.5 hours, preserving at least 99% of the original fatigue damage in the mission loadings. Finally, it is suggested that the WBE algorithm is suitable for the application of automotive accelerated fatigue tests.

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