切向气流对激光加热金属板非熔化穿孔效应的影响

刘峰; 彭国良; 杜太焦; 郑艳丽; 阎辉

doi:10.3788/CO.20130603.0332

切向气流对激光加热金属板非熔化穿孔效应的影响

doi: 10.3788/CO.20130603.0332

刘峰^1,2, ,,
彭国良¹,
杜太焦^1,2,
郑艳丽¹,
阎辉¹

1.
西北核技术研究所第五研究室, 陕西西安710024;
2.
激光与物质相互作用国家重点实验室, 陕西西安710024

基金项目:

激光与物质相互作用国家重点实验室基金资助项目(No.SKLLIM1102)

详细信息

作者简介:
刘峰(1962-),男,陕西榆林人,博士,研究员,1983年于兰州大学获得学士学位,1991年于西北核技术研究所获得硕士学位,2006年于西安电子科技大学获得博士学位,主要从事强激光大气传输及目标效应的理论和数值模拟研究。E-mail:liufeng-laser@163.com;彭国良(1985-),男,湖北大冶人,硕士,助理研究员,2006于清华大学获得学士学位,2009年于西北核技术研究所获得硕士学位,主要从事强激光效应的理论和数值模拟方面的研究。E-mail:pgl02@163.com

刘峰(1962-),男,陕西榆林人,博士,研究员,1983年于兰州大学获得学士学位,1991年于西北核技术研究所获得硕士学位,2006年于西安电子科技大学获得博士学位,主要从事强激光大气传输及目标效应的理论和数值模拟研究。E-mail:liufeng-laser@163.com;彭国良(1985-),男,湖北大冶人,硕士,助理研究员,2006于清华大学获得学士学位,2009年于西北核技术研究所获得硕士学位,主要从事强激光效应的理论和数值模拟方面的研究。E-mail:pgl02@163.com

通讯作者:
刘峰

中图分类号: TN249;TG665
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出版历程
- 收稿日期: 2013-02-16
- 修回日期: 2013-04-17
- 刊出日期: 2013-06-10

Influence of tangential airflows on burn-through effect with no-melting of metal heated by laser

1.
The 5th Research Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024, China;
2.
State Key Laboratory of Laser Interaction with Matter, Xi'an 710024, China

摘要

摘要: 针对切向气流加载导致激光加热金属板在熔化前的穿孔效应,利用金属薄板的弹性弯曲理论,推导出了两种典型光束(方形和圆形)照射下的弯曲挠度表达式,利用Mises理论给出了非熔化穿孔的破坏判据。研究结果表明:激光加热下材料强度降低是出现非熔化穿孔破坏的主要机理;薄板在光斑区的最大变形与气流速度、光斑直径、板厚与弹性模量(U2a4/Eh3)相关,穿孔破坏温度与气流速度、光斑直径及板厚(Ua/h)2相关;与方形光斑辐照相比,圆形光斑辐照的破坏阈值稍高一些。数值计算结果表明:0.8 Ma切向气流作用下,铝合金壳体的激光破坏能量阈值大大降低(可达40%~50%),典型不锈钢壳体的破坏阈值降低相对较小(20%左右),气流作用导致金属板破坏阈值的下降是需特别关注的问题。
- 激光辐照 /
- 激光加热 /
- 切向气流 /
- 薄板弹性弯曲 /
- 非熔化穿孔效应 /
- 破坏温度
Abstract: On the basis of elastic bending theory, the bending deflection expression by both quadrate and circinal facula irradiations is deduced for burn-through effect with no-melting of metal heated by a laser caused by tangential airflows. A rupture criterion for burn-through with no-melting is given out by the Mises theory. The study indicates that the material softened by laser heating is the primary mechanism for burn-through effect with no-melting. The maximal deflection of thin plate in the spot area is related to the airflow speed, spot diameter, plate thickness and the elasticity modulus(expression is U2a4/Eh3), the damage temperature is related to the airflow speed, spot diameter and the plate thickness(expression is (Ua/h)2), and the damage threshold under the circinal facula irradiated is higher than that under the quadrate facula. The numerical result indicates that for aluminum alloy shell, the damage threshold of laser energy can decrease much up to 40%-50% under 0.8 Ma tangential airflows, but it can decrease less(about 20%) for a stainless steel shell. The damage threshold decrease under airflows needs more attention.
- laser irradiation /
- laser heating /
- tangential airflow /
- thin plate elastic bending /
- burn-through with no-melting effect /
- damage temperature

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参考文献(1)

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