Ablation study of laser micromachining process with molecular dynamics simulation

Markopoulos, Angelos P.; Manolakos, D.E.

doi:10.1177/0954405415596190

Cited by 9 publications

(10 citation statements)

References 37 publications

(69 reference statements)

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“…This is the reason of inducing a non-homogeneous melting and they found two processes, namely, photomechanical spallation and evaporation towards the material removal. Markopoulos and Manolakos 137 have simulated laser ablation by considering the phenomenon of plasma shielding to fabricate micro-hole on metals using molybdenum and aluminium as workpiece materials. They have observed that the ablation rate increases with the laser fluence.…”

Section: Molecular Dynamics Simulation Of Micro-machining Processesmentioning

confidence: 99%

Micro-machining: An overview (Part II)

Jain

Patel

Ramkumar

et al. 2021

Journal of Micromanufacturing

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This article on ‘Micro-machining: An Overview (Part II)’ is in continuation to ‘Micro-machining: An Overview (Part I)’ published in this journal ( Journal of Micromanufacturing). It consists of four parts, namely, electrochemical micro-texturing, electrochemical spark micro-machining, molecular dynamics simulation and sustainability issues of micro-machining processes. Electrochemical micro-texturing (ECMTex) deals with various techniques developed for micro-texturing on different types of workpiece-surfaces, namely, flat, curved and free-form surfaces. Here, basically two categories of techniques have been reviewed, namely, with mask and without mask. It also deals with ‘single point tool micro-texturing’ which turns out to be a single-step technique requiring minimum time, but the accuracy and repeatability obtained after micro-texturing need to be critically analysed. For mass production, one needs to go for sinking kind of ECMTex processes. Electrochemical spark micro-machining (ECSMM) is an interesting hybrid (ECM+EDM) process which can be applied for electrically conducting as well as electrically non-conducting materials. However, the work reported in this article deals only with the electrically non-conducting materials for which this process was initially developed. This process has a lot of potential for theoretical work to be done. In this article, two theories of sparking/discharging have been briefly mentioned: single bubble discharging/sparking and single surface discharging. It also dicusses its applications for different types of electrically non-conducting materials. Molecular dynamics simulation (MDS) of micro-/nano-machining processes is very important, but it is very cumbersome to understand at atomic/molecular scale. In these processes, the material behaviour at micro-/nano-level machining is completely different as compared to bulk-machining (macro-machining) processes. Hence, some fundamentals of MDS have been discussed. It just gives the idea of available techniques, softwares and models for different types of processes. However, there is the need of further research work to be done for clearly understanding the MDS of micro-/nano-machining. In the end, the sustainability of micro-machining issues have been discussed, mainly based on the energy consumption per unit mass of production. It is concluded that the advanced micro-manufacturing processes are highly energy-intensive processes, and they need further studies to be done for making them more suitable from sustainability point of view. At the end of each section, some potential areas of research for enhancing the accuracy and repeatability, and minimising the production time of each process have been discussed.

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Section: Molecular Dynamics Simulation Of Micro-machining Processesmentioning

confidence: 99%

Micro-machining: An overview (Part II)

Jain

Patel

Ramkumar

et al. 2021

Journal of Micromanufacturing

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“…A lot of review articles are now available focussing on studying material-specific theories including metals [39,40], ceramics like silicon carbide [38] as well as semiconductors like silicon [41,42]. More recently advanced applications of MD have been made to explore elliptical vibration-assisted machining [43], laser ablation [44] and wire electrical discharge machining (EDM) [45].…”

Section: Simulation Application In Advance Subtractive Manufacturing Processesmentioning

confidence: 99%

Horizons of modern molecular dynamics simulation in digitalized solid freeform fabrication with advanced materials

Goel

Knaggs

Goel

et al. 2020

Materials Today Chemistry

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Our ability to shape and finish a component by combined methods of fabrication including (but not limited to) subtractive, additive and/or no theoretical mass-loss/addition during the fabrication is now popularly known as solid freeform fabrication. Fabrication of a telescope mirror is a typical example where grinding and polishing processes are first applied to shape the mirror and thereafter an optical coating is usually applied to enhance its optical performance. The area of nanomanufacturing cannot grow without a deep knowledge of the fundamentals of materials and consequently, the use of computer simulations is becoming ubiquitous. This article is intended to introduce the most recent advances in the computation benefit specific to the area of solid freeform fabrication as these systems are traversing through the journey of digitalisation and Industry-4.0. Specifically, this article demonstrates that the application of the latest materials modelling approaches, based on techniques such as molecular Just accepted in Materials Today Chemistry 2 dynamics, are enabling breakthroughs in applied precision manufacturing techniques.

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“…Laser-material interaction has been investigated for gold, silver, aluminum, copper, polycrystalline diamond, molybdenum, etc. [7][8][9][10][11][12] Surface integrity and microstructural changes in metals have also been examined by researchers [13][14][15] A very limited work has been reported on Ti6Al4V which finds a wide range of applications in aerospace, automotive, and medical industries. Micro holes for cooling of titanium alloy turbine blades are laser drilled.…”

Section: Introductionmentioning

confidence: 99%

An in-depth investigation into high fluence femtosecond laser percussion drilling of titanium alloy

Kumar

Samuel

Shunmugam

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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High fluence femtosecond laser percussion drilling has a potential to produce micro holes for cooling purpose in turbine blades made of titanium alloys due to its short interaction time with the material. For an in-depth investigation, numerical simulation is carried out using 2D axi-symmetric two-temperature and heat conduction models in tandem, mimicking the laser percussion drilling. Moving mesh approach in finite element based COMSOL Multiphysics software is used to arrive at the crater geometry during the ablation process. The heat conduction model provides the value of surface temperature after each pulse. Taking temperature-dependent thermo-physical and optical properties with intraband absorption effect, the simulations are carried out on a 2 mm thick Ti6Al4V plate for 1–15 pulses with fluence in the range of 0.84 to 8.4 J cm−2. For comparison, the simulation results based on room temperature properties are also included. Validation experiments are carried out and the crater morphology is measured using laser scanning confocal microscope. The overall average absolute deviations of the results for crater diameter and depth are within 20% and 40% respectively. The proposed simulation approach is robust and can be used to investigate multi pulses laser ablation process in any other applications.

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Ablation study of laser micromachining process with molecular dynamics simulation

Cited by 9 publications

References 37 publications

Micro-machining: An overview (Part II)

Micro-machining: An overview (Part II)

Horizons of modern molecular dynamics simulation in digitalized solid freeform fabrication with advanced materials

An in-depth investigation into high fluence femtosecond laser percussion drilling of titanium alloy

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