Forming Limit and Fracture Mode in Multiple-Pulse Laser Shock Micro-Bulging Process

Zheng Liu; Chao Zheng; Libin Song; Zhong Ji

doi:10.3788/CJL201946.0302004

Chinese Journal of Lasers, Volume. 46, Issue 3, 0302004(2019)

Forming Limit and Fracture Mode in Multiple-Pulse Laser Shock Micro-Bulging Process

Zheng Liu^1,2、*, Chao Zheng^1,2、*, Libin Song^1,2, and Zhong Ji^1,2

¹ Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, Shandong 250061, China

² School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250061, China

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Figures & Tables(12)

Fig. 1. Schematic of experimental set-up for multiple-pulse laser shock micro-bulging process

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Fig. 2. Measurement position of bulging height

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Fig. 3. Influence of laser power density on forming limit of micro-bulging

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Fig. 4. Influence of initial grain size on forming limit of micro-bulging

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Fig. 5. Influence of foil thickness on forming limit of micro-bulging

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$Tensile fracture morphology of T2 pure copper foil. (a) General view of fractured specimen; (b) fracture surface of region 1 after magnification$

Fig. 6. Tensile fracture morphology of T2 pure copper foil. (a) General view of fractured specimen; (b) fracture surface of region 1 after magnification

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$Shear fracture morphology of T2 pure copper foil. (a) General view of fractured specimen; (b) enlarged fracture surface$

Fig. 7. Shear fracture morphology of T2 pure copper foil. (a) General view of fractured specimen; (b) enlarged fracture surface

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$Mixed fracture morphology of T2 pure copper foil$

Fig. 8. Mixed fracture morphology of T2 pure copper foil

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$Influence of laser power density and number of pulses on fracture mode$

Fig. 9. Influence of laser power density and number of pulses on fracture mode

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$Spallation morphology of T2 pure copper foil. (a) General view of spallation fractured specimen; (b) fracture surface of region 1 after magnification$

Fig. 10. Spallation morphology of T2 pure copper foil. (a) General view of spallation fractured specimen; (b) fracture surface of region 1 after magnification

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Table 1. Heat treatment parameters and corresponding grain sizes of T2 pure copper foil
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Table 1. Heat treatment parameters and corresponding grain sizes of T2 pure copper foil
Thickness /μm Annealingtemperature /℃ Grain size /μm
50 450 12.56
80 450 13.10
80 600 24.57
80 750 38.40
100 450 14.88

Table 2. Main experimental parameters
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Table 2. Main experimental parameters
Parameter Laser beamdiameter /mm Rubber sheetthickness /μm Quartz glassthickness /mm Black paintthickness /μm Die holediameter /mm
Value 2.5 200 2 ≈50 1.4

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Zheng Liu, Chao Zheng, Libin Song, Zhong Ji. Forming Limit and Fracture Mode in Multiple-Pulse Laser Shock Micro-Bulging Process[J]. Chinese Journal of Lasers, 2019, 46(3): 0302004

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