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Research Papers

Temperature Gradient Mechanism on Laser Bending of Borosilicate Glass Sheet

[+] Author and Article Information
Dongjiang Wu

Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning Province 116024, PR of Chinadjwudut@dlut.edu.cn

Guangyi Ma, Fangyong Niu, Dongming Guo

Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning Province 116024, PR of China

J. Manuf. Sci. Eng 132(1), 011013 (Jan 27, 2010) (6 pages) doi:10.1115/1.4000722 History: Received January 17, 2008; Revised November 30, 2009; Published January 27, 2010; Online January 27, 2010

The present work is a research on the laser forming process of borosilicate glass sheet. The laser forming mechanism was analyzed, and the temperature gradient mechanism was considered as the main forming mechanism of glass bending. According to the experimental results, a thermomechanical finite element (FE)-simulation was applied for investigating the temperature distribution and thermal stress in the thickness direction of the specimen. Cracks, as the primary defect, were summarized to three kinds: “Y” cracks, straight cracks, and arc cracks, while their forming mechanisms were proposed.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Photos of machined sample

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Figure 2

Two different zones of a laser bending specimen: accumulated zone (labeled as 1) and expanding zone (labeled as 2)

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Figure 3

Model of FEM simulation

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Figure 4

Nonlinear relationship between material properties and temperature

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Figure 5

Temperature distribution of different direction position in x-direction (y=0)

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Figure 6

Temperature distribution in the specimen thickness

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Figure 7

Distribution of stress ρy during laser bending (x=2.5 mm,y=0)

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Figure 8

Displacement on the z-axis of node A during laser bending

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Figure 9

Cracks arisen in the bending process: (a) Y crack, (b) straight crack, and (c) arc crack

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Figure 10

Forming schematic of (a) Y cracks and (b) straight cracks

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Figure 11

Stress field of σx along (a) y-direction and σy along (b) x-direction

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