Study of thermal cleavage of glass pre-loaded by a contact ball-lens
碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === This study mainly focuses on the investigation of the crack growth of glass in laser cleavage with a pre-load from a contact ball-lens. In the numerical analysis of the optical characteristics for the ball-lens, the laser spot size and intensity profile w...
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2013
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| Online Access: | http://ndltd.ncl.edu.tw/handle/09000940191160886772 |
| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === This study mainly focuses on the investigation of the crack growth of glass in laser cleavage with a pre-load from a contact ball-lens. In the numerical analysis of the optical characteristics for the ball-lens, the laser spot size and intensity profile were simulated by ZEMAX software and compared with the experimental measurement. Furthermore the temperature and stress distribution of the glass with various laser power and pre-loads were simulated by ANSYS software.
In the experimental approach, an Nd-YAG laser with a wavelength of 1064 nm was used to heat the carbon coating surface of the soda-lime glass through the contact ball-lens. The result shows that the increase of laser power will increase the distribution length of the side crack. Also the penetration depth of the crack will increase with the laser power and pre-load. However the distribution length of the side crack was reduced with the increase of the pre-load and it could extend the length of the straight cut and the penetration depth. It can be found the region of the side crack was dramatically reduced by an appropriate pre-load and the cutting quality was improved in the present study.
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