研究目的
To investigate the distribution of the residual stress and look for an optimal manner of irradiation to control residual tensile stress on fused silica after CO2 laser irradiation.
研究成果
The numerical simulation revealed that high tensile stress remains on the surface of fused silica after CO2 laser irradiation due to rapid cooling. Three processes were proposed to reduce this stress, with treating fused silica in a thermostatic oven showing the most promise. Ensuring the workpiece remains at a temperature around the strain point for sufficient time is key to decreasing residual tensile stress.
研究不足
The study focuses on numerical simulation rather than experimental validation. The practical implementation of the proposed processes to reduce residual tensile stress may require further experimental testing.
1：Experimental Design and Method Selection:
A numerical model was built for simulating the dynamic behavior of fused silica when irradiated by CO2 laser, considering laser energy absorption, heat transmission, viscoelastic behavior of fused silica, and thermally induced stress.
2：Sample Selection and Data Sources:
A symmetric model of 1mm×1mm was built to simulate the heat-affected zone.
3：List of Experimental Equipment and Materials:
CO2 laser with specified power and beam radius was used as the heat source.
4：Experimental Procedures and Operational Workflow:
The simulation involved heating the surface of fused silica with a laser beam and analyzing the temperature and stress distribution.
5：Data Analysis Methods:
The simulation results were analyzed to understand the formation and distribution of residual stress and to compare the effectiveness of three proposed processes to reduce residual tensile stress.
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