Melt-through characteristics in continuous beam irradiation of flying metal samples in flow speeds up to 85m/s

Baek, Won-Kye; Lee, Kyeong-cheol; An, Se-il; Shin, Wan-Soon; Yoh, Jack J.

doi:10.1016/j.optlastec.2012.06.039

Cited by 16 publications

(6 citation statements)

References 11 publications

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“…[9][10][11][12][13][14][15][16] However, most of the relevant studies mainly focused on metal materials and carbon fiber-reinforced polymer composites, which with a low melting and cracking temperature, incur damage at lower temperatures. [17][18][19][20][21] Due to the low density, low coefficient of thermal expansion, high specific strength, and excellent resistance to ablation, SiC ceramic matrix reinforced by continuous carbon fibers composite (C/SiC) has been widely used as a high-temperature component. [22][23][24][25][26] According to the numerical simulation program of laser ablation, Guoliang et al analyzed the effects of laser intensity, repetitive frequency, and duty radio on C/SiC composite, showing that the higher the power density and duty ratio, the higher the ablation efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, the exploration of the laser ablation effect has been getting increasing attention as the high‐energy laser shows a higher threat and better adjustability 9–16 . However, most of the relevant studies mainly focused on metal materials and carbon fiber‐reinforced polymer composites, which with a low melting and cracking temperature, incur damage at lower temperatures 17–21 …”

Section: Introductionmentioning

confidence: 99%

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Study on ablation behavior and mechanism of C/SiC composite irradiated by a laser with various parameters

Yang,

Jiang,

Chen

et al. 2023

Int J Applied Ceramic Tech

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C/SiC composite has been widely used as a high‐temperature material for engineering components due to its excellent thermal properties. Facing the rapid development and threat of high‐energy laser, study on the ablation resistance under laser irradiation is strongly required. In this work, a continuous high‐energy laser was applied to explore the laser ablation behavior and mechanism of C/SiC composite. From the results, C/SiC composite shows different morphologies when irradiated at various laser power densities for 500 and 700 W/cm2. We divided the ablation area into three regions; the central, transition, and edge regions, where the formation of SiO2, SiO, and the breakage of carbon fiber were observed. The generated highly reflective SiO2 layer reduces the absorption of laser energy, which is beneficial to lower the back‐surface temperature and reduce the damage of composite. In addition, we put forward the ablation physical models and ablation mechanisms irradiated at different power densities. The work provides a basis for the laser ablation resistance of C/SiC composites under different conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on ablation behavior and mechanism of C/SiC composite irradiated by a laser with various parameters

Yang,

Jiang,

Chen

et al. 2023

Int J Applied Ceramic Tech

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“…This process is influenced by energy absorption rates, rates of transient air flow as well as generation of a plasma in front of the sample. [1][2][3][4][5] Typical laser powers are normally limited to several tens of kilowatts. The advent of lasers with a continuous wave (cw) power of 100 kW [6][7][8] in the past decade has facilitated a new level of available laser powers.…”

Section: Introductionmentioning

confidence: 99%

Laser penetration of metal targets with high powers of up to 120 kW

Reich,

Goesmann,

Lueck

et al. 2023

High Power Lasers: Technology and Systems, Platforms, Effects VI

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Since high-power fiber lasers are emerging in the field of directed energy, the fundamental interaction of these lasers with target materials has to be investigated. For this purpose, experiments with short propagation distances can be performed. The aspects of high-power propagation through the atmosphere over large distances are excluded and go beyond the scope of this work. We show experimental results of laser-matter interaction with up to 120 kW continuous wave laser power. The targets are 10 mm thick plates of aluminum and steel as representative materials commonly used for construction purposes. A decreasing perforation time is observed with increasing laser power. For low powers, the aluminum samples show a much higher perforation time compared to the steel samples. This changes at roughly 80 kW. Above this value the steel samples withstand the laser irradiation longer. This behavior can be attributed to the much higher thermal conductivity of aluminum compared to steel. The change of dominant effects from low to high laser powers is discussed. One further important aspect is the effective energy coupling into the sample. This is investigated by finite element simulations with an adjustable absorptivity. For the steel samples a high absorption rate of around 75 % is observed at low laser powers, which drops down to roughly 15 % at the highest laser powers. For the aluminum samples, on the other hand, an almost constant value of around 15 % is observed.

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“…It depends more on the specific parameters. The air flow can lead to faster removal of molten material, but it can also lead to sufficient cooling of the specimen, which prolongs the perforation 11,12,19,21 . Melt pool dynamics can strongly depend on experimental conditions such as air flow velocity and direction of gravity 9,21,22 .…”

Section: Introductionmentioning

confidence: 99%

Change of dominant material properties in laserperforation process with high-energy lasers up to 120kilowatt

Reich,

Goesmann,

Heunoske

et al. 2023

Preprint

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In laser materials processing, energy losses due to reflection, heat conduction and thermal radiation play an important role. In this publication, we show that with increasing laser intensity, the energy lost within the sample becomes less important for metal perforation processes. We compare the laser-matter interaction of aluminium and steel plates. Material parameters such as density, melting point and especially thermal conductivity differ strongly, leading to much longer perforation times for aluminium in comparison to steel at laser powers of 20 kW. However, this behaviour changes at laser powers of more than 80 kW where the perforation times of aluminium become shorter than the corresponding times for steel. By comparing experimental data and simulations, we conclude that thermal conduction is the dominant factor of energy loss at low powers, but is reduced at high laser powers.

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Melt-through characteristics in continuous beam irradiation of flying metal samples in flow speeds up to 85m/s

Cited by 16 publications

References 11 publications

Study on ablation behavior and mechanism of C/SiC composite irradiated by a laser with various parameters

Study on ablation behavior and mechanism of C/SiC composite irradiated by a laser with various parameters

Laser penetration of metal targets with high powers of up to 120 kW

Change of dominant material properties in laserperforation process with high-energy lasers up to 120kilowatt

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