Calculation for the Thermal Stress Damage in the Thin Plate of Al Irradiated by CW Laser Beam
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摘要: 用有限元法模拟计算了连续激光对受预载荷作用的铝合金薄板产生的热应力破坏,得到了破坏阈值与预载荷、激光功率密度及激光波长的关系。计算中考虑了材料的物性参数如表面耦合系数、屈服强度、膨胀系数等随温度变化而改变。所得结论与文献[1]对铝合金材料的实验结果在量级上相符。Abstract: The parameters of the material of Al such as the thermal coupling coefficient conductivity, yield strength and so on, will change with the change of temperature induced by laser heating. It will influence the physical and mechanical properties of the material. The large thermal stress can result in the damage of the structure of material. Specially, in the case of the action of very large preload being present, the material structure can be yielded, deformed or fractured due to the action of the thermal stress and the preload, that is , the material structure may be damaged before the melt through of it. The damage effects of thermal stress in the thin plate of Al loaded induced by laser beam is calculated by using the method of finite element. The damage thresholds dependence on the preloads, laser power densities and wavelength are given out. The change of parameters mentioned above with the temperature is considered in the calculation. The results are in agreement with the experimental result given by Medford.
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Key words:
- laser damage /
- thermal stress /
- finite element analysis
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Medford J E, Gray P M. AIAA-80-1550, 1980. Zienkiewicz O C. The Finite Element Method. McGraw-Hill, 1977. Gatewood B B. Thermal Stress. McGraw-Hill, 1975. Garrison J N. AD-A 034877, 1976. 航空材料编写组.航空材料手册. 国防工业出版社, 1972. Duley W W. Laser Processing and Anaysis of Materials. Acadcmic, 1982.
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