Numerical Simulation of Transient Three-Dimensional Temperature and Kerf Formation in Laser Fusion Cutting

Kheloufi, Karim; Amara, El-Hachemi; Boutarfaïa, Ahmed

doi:10.1115/1.4030658

Cited by 26 publications

(23 citation statements)

References 29 publications

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“…This observation confirms the prevailing significance of laser power in relation to which one should determine as high cutting speed as possible, with the ultimate aim of enhancing process efficiency. Given that an increase in cutting speed narrows kerf width, 42,43 which consequently minimizes the interaction area as well as interaction time of the assist gas jet and melt thus reducing adequate melt ejection, 38 the formulation of the optimization problem and the determined solution seem adequate. Considering that in CO 2 laser cutting of stainless steel sheets between 20% and 60% 44 of the used laser power might be coupled into the material, taking into account multiple reflections from the cut front and cut channel, the obtained process efficiency of about 25% is quite high.…”

Section: Resultsmentioning

confidence: 99%

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Madić

Gadallah

Petković

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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For an efficient use of laser cutting technology, it is of great importance to analyze the impact of process parameters on different performance indicators, such as cut quality criteria, productivity criteria, costs as well as environmental performance criteria (energy and resource efficiency). Having this in mind, this study presents the experimental results of CO2 laser fusion cutting of AISI 304 stainless steel using nitrogen, with the aim of developing a semi-empirical mathematical model for the estimation of process efficiency as an important indicator of the achievable energy transfer efficiency in the cutting process. The model was developed by relating the theoretical power needed to melt the volume per unit time and used laser power, where the change of kerf width was modeled using an empirical power model in terms of laser cutting parameters such as laser power, cutting speed, and focus position. The obtained results indicated the dominant effect of the focus position on the change in process efficiency, followed by the cutting speed and laser power. In addition, in order to maximize process efficiency and simultaneously ensure high cut quality without dross formation, a laser cutting optimization problem with constraints was formulated and solved. Also, a multi-objective optimization problem aimed at simultaneous optimization of process efficiency and material removal rate was formulated and solved, where the determined set of Pareto non-dominated solutions was analyzed by using the entropy method and multi-criteria decision analysis method, that is, the Technique for Order of Preference by Similarity to Ideal Solution. The optimization results revealed that in order to enhance process efficiency and material removal rate, while ensuring high cut quality without dross formation, focusing the laser beam deep into the bulk of material is needed with particular trade-offs between laser power and cutting speed levels at high pressure levels of nitrogen.

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Section: Resultsmentioning

confidence: 99%

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Madić

Gadallah

Petković

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The distribution of laser beam was considered to be an ideal Gauss distribution. The intensity of the laser beam is given by the following equation, [23]…”

Section: Methodsmentioning

confidence: 99%

Fabrication of PDMS chips by laser engraving for protein enrichments

Sun

Ding

Chen

et al. 2022

Journal of Electrical Engineering

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PDMS (Polydimethylsiloxane) chips are increasingly important for the application of fluorescence measurements due to their auto-fluorescence free, excellent transparency, and biocompatibility. However, the design of PDMS microfluidic chips requires to fabricate plenty of molds for structure optimization, resulting in high cost. In the present, PDMS chips with nafion membrane were fabricated by simple and low-cost method for bull serum albumin (BSA) enrichment. To optimize the laser cutting and bonding parameters, simulation models were established using Bilinear Kinematic and Mooney-Rivlin models, respectively. The influence of laser power and cutting speed on the width and depth of the micro-channels was investigated. And the effect of bonding pressure on the deformation of PDMS micro-channel and stress distribution near the micro-channels was also analyzed. The leakage test and BSA enrichment demonstrated the practicability and feasibility of the present fabrication method in this work.

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“…Other numerical methods include Finite Differences [13][14][15], Boundary Elements [16,17] and Finite Volumes [18,19]. However, numerical methods are computationally expensive in general, limiting their application to small plate geometries and simple laser trajectories, requiring full time history simulations.…”

Section: Laser Heating/cutting Simulationmentioning

confidence: 99%

Fast Simulation of Laser Heating Processes on Thin Metal Plates with FFT Using CPU/GPU Hardware

et al. 2020

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In flexible manufacturing systems, fast feedback from simulation solutions is required for effective tool path planning and parameter optimization. In the particular sub-domain of laser heating/cutting of thin rectangular plates, current state-of-the-art methods include frequency-domain (spectral) analytic solutions that greatly reduce the required computational time in comparison to industry standard finite element based approaches. However, these spectral solutions have not been presented previously in terms of Fourier methods and Fast Fourier Transform (FFT) implementations. This manuscript presents four different schemes that translate the problem of laser heating of rectangular plates into equivalent FFT problems. The presented schemes make use of the FFT algorithm to reduce the computational time complexity of the problem from O ( M 2 N 2 ) to O ( M N log ( M N ) ) (with M × N being the discretization size of the plate). The test results show that the implemented schemes outperform previous non-FFT approaches both in CPU and GPU hardware, resulting in 100 × faster runs. Future work addresses thermal/stress analysis, non-rectangular geometries and non-linear interactions (such as material melting/ablation, convection and radiation heat transfer).

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Numerical Simulation of Transient Three-Dimensional Temperature and Kerf Formation in Laser Fusion Cutting

Cited by 26 publications

References 29 publications

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Fabrication of PDMS chips by laser engraving for protein enrichments

Fast Simulation of Laser Heating Processes on Thin Metal Plates with FFT Using CPU/GPU Hardware

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