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Experimental and Numerical Investigations of a Novel Laser Impact Liquid Flexible Microforming Process

School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
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Metals 2018, 8(8), 599; https://doi.org/10.3390/met8080599
Received: 26 June 2018 / Revised: 23 July 2018 / Accepted: 27 July 2018 / Published: 31 July 2018
(This article belongs to the Special Issue Metal Micro-forming)
A novel high strain rate microforming technique, laser impact liquid flexible embossing (LILFE), which uses laser induced shock waves as an energy source, and liquid as a force transmission medium, is proposed by this paper in order to emboss three-dimensional large area micro arrays on metallic foils and to overcome some of the defects of laser direct shock microembossing technology. The influences of laser energy and workpiece thickness on the deformation characteristics of the pure copper foils with the LILFE process were investigated through experiments and numerical simulation. A finite element model was built to further understand the typical stages of deformation, and the results of the numerical simulation are consistent with those achieved from the experiments. The experimental and simulation results show that the forming accuracy and depth of the embossed parts increases with the increase in laser energy and decrease in workpiece thickness. The thickness thinning rate of the embossed parts increases with the decrease of the workpiece thickness, and the severest thickness thinning occurs at the bar corner region. The experimental results also show that the LILFE process can protect the workpiece surface from being ablated and damaged, and can ensure the surface quality of the formed parts. Besides, the numerical simulation studies reveal the plastic strain distribution of embossed microfeatures under different laser energy. View Full-Text
Keywords: laser impact liquid flexible embossing; microforming; 3-D large area micro arrays; liquid shock wave; high strain rate forming; numerical simulation laser impact liquid flexible embossing; microforming; 3-D large area micro arrays; liquid shock wave; high strain rate forming; numerical simulation
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MDPI and ACS Style

Liu, F.; Liu, H.; Jiang, C.; Ma, Y.; Wang, X. Experimental and Numerical Investigations of a Novel Laser Impact Liquid Flexible Microforming Process. Metals 2018, 8, 599.

AMA Style

Liu F, Liu H, Jiang C, Ma Y, Wang X. Experimental and Numerical Investigations of a Novel Laser Impact Liquid Flexible Microforming Process. Metals. 2018; 8(8):599.

Chicago/Turabian Style

Liu, Fei; Liu, Huixia; Jiang, Chenkun; Ma, Youjuan; Wang, Xiao. 2018. "Experimental and Numerical Investigations of a Novel Laser Impact Liquid Flexible Microforming Process" Metals 8, no. 8: 599.

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