An investigation of energy loss mechanisms in water-jet assisted underwater laser cutting process using an analytical model

Mullick, Suvradip; Madhukar, Yuvraj K.; Roy, Subhransu; Nath, Ashish Kumar

doi:10.1016/j.ijmachtools.2015.02.005

Cited by 32 publications

(11 citation statements)

References 19 publications

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“…The vital factor of this procedure is step (4), which means that adequate drainage space is essential for LWJ machining, or the stability of the water jet will be strongly disturbed by the reversed spurting slags and spray. As a result, the CMCs material removal is severely weakened by this negative phenomenon [27]. Therefore, the numerical simulation can hardly reveal actual machining abidingly as time goes on.…”

Section: Influence Of Different Laser Pulse Energy On Ablation Depthmentioning

confidence: 99%

Theoretical and Experimental Investigation on SiC/SiC Ceramic Matrix Composites Machining with Laser Water Jet

Bai

Ding

et al. 2022

Applied Sciences

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SiC/SiC ceramic matrix composites (CMCs) are widely applied in the aerospace and nuclear industries due to their excellent material nature (strength, hardness, and irradiation tolerance) at high-temperature loads. However, high-quality machining cannot be easily realized because of the anisotropic material structure and its properties. In this study, a laser water jet (LWJ) was adopted for CMCs machining. Firstly, the finite element model (FEM) was established describing a representative three-dimensional microstructure including weft yarn, warp yarn, SiC base, and the pyrolytic carbon (PyC) fiber coating. The temperature distribution, as well as its evolution rule on substrate surface under LWJ machining, was analyzed. Moreover, a single-dot ablation test was carried out to verify the accuracy of the numerical simulation model. Secondly, the variation in maximum temperatures under different laser pulse energy was obtained by means of FEM. Nonetheless, a non-negligible deviation emerged in the ablation depth of the numerical calculation and experimental results. Although the simulation results were obviously superior to the experimental results, their proportions of different machining parameters reached an agreement. This phenomenon can be explained by the processing characteristics of LWJ. Finally, single-row and multi-row scribing experiments for CMCs with 3 mm thickness were developed to clarify the processing capacity of LWJ. The experimental results indicated that single-tow scribing has a limiting value at a groove depth of 2461 μm, while complete cutting off can only be realized by multi-row scribing of LWJ. In addition, the cross-section of CMCs treated by LWJ presented a surface morphology without a recast layer, pulling out of SiC fibers, and delamination. The theoretical and experimental results can offer primary technical support for the high-quality machining of CMCs.

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Section: Influence Of Different Laser Pulse Energy On Ablation Depthmentioning

confidence: 99%

Theoretical and Experimental Investigation on SiC/SiC Ceramic Matrix Composites Machining with Laser Water Jet

Bai

Ding

et al. 2022

Applied Sciences

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“…The water-assisted laser micro-machining technologies include underwater laser processing, 18,19 water jet-guided laser processing, 20,21 and water jet-assisted laser processing. 22,23 For the above three water-assisted laser machining methods, the water takes cooling effect and flushes the material debris or the molten material away.…”

Section: Introductionmentioning

confidence: 99%

“…In order to weaken the heat‐affected zone, recast layers, and micro crack of laser processing on the material surface, there have been increasing studies on water‐assisted laser micro‐machining. The water‐assisted laser micro‐machining technologies include underwater laser processing, 18,19 water jet‐guided laser processing, 20,21 and water jet‐assisted laser processing 22,23 . For the above three water‐assisted laser machining methods, the water takes cooling effect and flushes the material debris or the molten material away.…”

Section: Introductionmentioning

confidence: 99%

Non‐damage deep etching of SiC by hybrid laser‐high temperature chemical processing

Wang

Han

Ehrhardt

et al. 2022

Int J Applied Ceramic Tech

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SiC is considered as preferred material for micro‐electro‐mechanical system in the future. The excellent mechanical property and chemical stability make it difficult to perform deep etching. The hybrid laser‐high temperature chemical etching is investigated to realize non‐damage deep etching of SiC. The influences of defocus, laser pulse interval, laser intensity, and pulse number on etching depth are researched. The optimized laser parameter for SiC non‐damage deep etching is laser intensity of 10 × 109 W/cm2 with a pulse interval of 10 ms. In order to analyze the interaction mechanism, the temperature field and laser‐induced liquid jet in the liquid environment are calculated numerically. It is concluded that the material removal mechanism consists of laser heating vaporization during laser pulse, mechanical effect of laser‐induced liquid jet impact between two adjacent laser pulses and chemical etching in laser‐induced local high‐temperature environment. The chemical reaction between SiC and mixture of HF, and HNO3 solution produces gases and fluosilicic acid and effectively reduces the roughness of the modified layer making the surface smoother, and also removes the microcracks on the side wall of the etched region.

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“…The study of the influence of the surface quality of aluminum ceramics found that the use of low-pressure water-jet-assisted laser etching to process alumina ceramics can reduce the generation of micro-cracks and the accumulation of slag on the processed surface, yielding good processing quality. Mullick [ 16 ] established the analytical model of water-jet-assisted laser processing and found that 40% to 50% of the laser energy loss come from the vaporization of water. Zhu et al [ 17 ] experimentally studied the effects of nanosecond laser and hybrid laser water-jet technology on the processing performance of germanium microgrooves and also analyzed and discussed the effects of laser pulse energy, pulse overlap, and focal plane position on the groove geometry and heat.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Surface Temperature Field of Aluminum Alloy Etched by Laser Water Jet Composite Machining

Chen

Liu

et al. 2020

Materials

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This paper studies the compound effect of liquid medium and laser on the workpiece and analyses the law of material surface temperature change during the processing. Taking 7075-T6 aluminum alloy as the research object, the surface temperature field of aluminum alloy processed using water-jet-assisted laser machining under different process parameters was simulated using finite element software. In addition, the temperature field of the material surface was detected in real-time using the self-built water-jet-assisted laser machining temperature field detection system, and the processing results were observed and verified using an optical microscope, scanning electron microscope, and energy spectrum analyzer. The results show that when the water jet inflow angle is 45°, the heat-affected area of the material surface is the smallest, and the cooling effect of the temperature field of the material surface is better. Considering the liquidus melting point of 7075 aluminum alloys, it is concluded that the processing effect is better when the water jet velocity is 14 m·s−1, the laser power is 100 W, and the laser scanning speed is 1.2 mm·s−1. At this time, the quality of the tank is relatively good, there are no cracks in the bottom of the tank, and there is less slag accumulation. Compared with anhydrous laser etching, water-jet-assisted laser etching can reduce the problems of micro-cracks, molten slag, and the formation of a recast layer in laser etching and improve the quality of the workpiece, and the composition of the bottom slag does not change. This study provides theoretical guidance and application support for the selection and optimization of process parameters for water-jet-assisted laser etching of aluminum alloy and further enriches the heat transfer mechanism of multi-field coupling in the process of water-jet-assisted laser machining.

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An investigation of energy loss mechanisms in water-jet assisted underwater laser cutting process using an analytical model

Cited by 32 publications

References 19 publications

Theoretical and Experimental Investigation on SiC/SiC Ceramic Matrix Composites Machining with Laser Water Jet

Theoretical and Experimental Investigation on SiC/SiC Ceramic Matrix Composites Machining with Laser Water Jet

Non‐damage deep etching of SiC by hybrid laser‐high temperature chemical processing

Study on the Influence of Surface Temperature Field of Aluminum Alloy Etched by Laser Water Jet Composite Machining

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