Investigation on grain size effect and forming mechanism of laser shock hydraulic microforming of copper foil

Gu, Xin; Wang, Xiao; Ma, Youjuan; Zhang, Haokun; Lu, Jiaxin; Wang, Keyang; Liu, Huixia

doi:10.1007/s00170-021-06969-9

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…The reduction of t/d ratio and the increase of surface roughness will aggravate the uneven deformation and eventually lead to fracture [ 15 ]. Gu et al [ 16 ] studied the size effect in laser shock hydraulic micro-forming and found that when t/d > 1, with the increase of grain size and the decrease of workpiece thickness, the overall thickness thinning rate increases and local necking occurs in the bulging transition zone. When t/d < 1, the thickness distribution of micro bulging parts is poor and the surface quality deteriorates sharply.…”

Section: Introductionmentioning

confidence: 99%

Mold Size Effect in Microscale Laser Dynamic Flexible Bulging Assisted by Laser Pre-Shocking

et al. 2022

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The size effect seriously affects the forming quality of micro-formed parts in the field of micro-forming. This paper focuses on the influence of the mold size effect in microscale laser dynamic flexible bulging (μLDFB). The experimental results indicate that, for the copper foil with a given thickness, there are suitable mold characteristic sizes to obtain better forming quality. The surface quality of bulging parts is poor when the mold characteristic size is small. However, the forming symmetry and forming uniformity of bulging samples are reduced when the mold characteristic size is large. As the laser pulse energy increases, the plastic strain increases, and the bulging samples experience five stages: uniform plastic deformation, local necking, cracks in the bulging zone, complete fracture in the bulging zone and complete rupture at the mold entrance zone. The increase of the surface roughening rate caused by the increase of grain size and mold characteristic size makes local necking easier, which further leads to fracture. On this basis, in this paper laser pre-shocking (LPS) is introduced to improve the forming quality. Comparative experiments show that LPS has a positive effect on improving the surface quality and the forming performance of bulging samples. The forming limit of bulging samples is increased and the occurrence of local necking is delayed.

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Section: Introductionmentioning

confidence: 99%

Mold Size Effect in Microscale Laser Dynamic Flexible Bulging Assisted by Laser Pre-Shocking

et al. 2022

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“…With the miniaturization trend of mechanical equipment, the requirements for micro-parts are increasing significantly [ 1 , 2 , 3 , 4 , 5 ]. Among many manufacturing processes for micro-parts, the foil-forming process has attracted the most attention due to the high production efficiency and material utilization, endowing it with competitive advantage in manufacturing parts with a large specific surface area such as fuel panels and corrugated plates [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Size Effects on the Elongation of Ti-2.5Al-1.5Mn Foils with Digital Image Correlation Method

Wang

Zhang

2021

Materials

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The increasing demand for parts with a large specific surface area such as fuel panels has put forward higher requirements for the plasticity of foils. However, the deformation characteristics of foils is hard to be illustrated in-depth due to their very short deformation process. In this paper, the digital image correlation method was applied to investigate the influence of size effect on the elongation of Ti-2.5Al-1.5Mn foils. The results showed that the elongation of Ti-2.5Al-1.5Mn foils increased with the decrease in the ratio of thickness-to-grain diameter (t/d value). Then, the macro deformation distribution of foils was analyzed, combined with their microstructure characteristics, and it was found that the increasing influence of individual grain heterogeneity leads to the earlier formation of a concentrated deformation zone, which changes the deformation mode of foils. The concentrated deformation increases with the decrease in t/d value, thus dominating the trend of the foil elongation. Furthermore, the homogeneous deformation and concentrated deformation can be divided into two different zones by a certain critical t/d value. These results provide a basis for understanding and further exploration of the deformation behavior of titanium foils.

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Investigation of liquid medium concentration and pressure on formability in laser-activated high-speed hydraulic microforming

Liu

Zhang

et al. 2022

Int J Adv Manuf Technol

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Investigation on grain size effect and forming mechanism of laser shock hydraulic microforming of copper foil

Cited by 7 publications

References 33 publications

Mold Size Effect in Microscale Laser Dynamic Flexible Bulging Assisted by Laser Pre-Shocking

Mold Size Effect in Microscale Laser Dynamic Flexible Bulging Assisted by Laser Pre-Shocking

Investigation of the Size Effects on the Elongation of Ti-2.5Al-1.5Mn Foils with Digital Image Correlation Method

Investigation of liquid medium concentration and pressure on formability in laser-activated high-speed hydraulic microforming

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