Dynamic characteristics of thin aluminum under high pressure loading measured by shading principle
-
摘要: 为了检测强脉冲激光冲击加载材料发生的动态变化,采用遮光原理设计了一种新的检测仪器,能较为准确地检测出在冲击过程中试样的动态特征量。结果表明,铝薄板（L2）在激光冲击成形过程中弹性变形和塑性变形同时存在,塑性变形的时间远远大于弹性变形。试样中心区域在弹性变形阶段的平均变形速率为3.2103m/s,试样的平均应变率为8.9 104s-1。该结果为相关激光冲击成形技术发展提供了实验依据。Abstract: In order to measure dynamic characteristics of a specimen in the laser shock forming laser shock forming accurately, a new experimental device was designed to detect the dynamic change of the loaded material based on shading principle. The experimental results indicate that elastic deformation and plastic deformation of 1060 thin aluminum coexist during the process of laser shock forming, and the existence of plastic deformation period is far longer than the elastic deformation. Based on the experiment, it can be calculated that the average speed of elastic deformation and average strain rate of the sample in central area are 3.2103m/s and 8.9104s-1 respectively. The results provide the experimental evidence for the development of relevant laser shock forming technology.
-
Keywords:
- laser technique /
- laser shock forming /
- shading principle /
- deformation velocity /
- strain rate
-
-
[1] ZHOU J Z,ZHANG Y K,YANG J C,et al.A new technique on plastic forming of metal sheet by laser shock wave[J].China Mechanical Engineering,2002,13(22)：1938-1941(in Chinese).
[2] PEYER P,FABBOR R.Laser shock processing:a review of the physics and applications[J].Optical and Quantum Electronics,1995,27(12):1213-1229.
[3] ZHOU J Zh,YANG J C,ZHANG Y K,et al.A study on super-speed forming of metal sheet by laser shock waves[J].Journal of Material Processing Technology,2002,129(1/3):241-244.
[4] ZHOU J Zh,ZHANG Y K,ZHOU M,et al.Theoretical analysis on deformation of sheet metal under one laser shot loading[J].Chinese Journal of Lasers,2005,32(1):135-138(in Chinese).
[5] WANG G L,ZHOU J Zh.Experiments and simulation of Al-alloy plate deforming by laser shock forming[J].Laser Technology,2007,31(5):555-557(in Chinese).
[6] WANG F.The theory of pulsed laser shock forming and experimental research[D].Shanghai:Shanghai Jiaotong University,2008:65-69(in Chinese).
[7] MEYERS M A,GREGORI F,KAD B K,et al.Laser-induced shock compression of monocrystalline copper:characterization and analysis[J].Acta Materialia,2003,51(5):121l-1228.
[8] BAYAND S H,MAHER W E,HALL R B.Laser-target interaction near the plasma-formation threshold[J].Journal of Applied Physics,1980,51(11):5699-5707.
[9] TOLLIER L,BARTNICKI E,FABBRO R.Experimental and numerical study of laser-driven spallation on aluminum with VISAR diagnostic[J].Proceedings of SPIE,1996,2789:254-263.
[10] MALONE R M,FROGGET B C,KAUFMAN M I,et al.Overview of the line-imaging VISAR diagnostic at the National Ignition Facility (NIF)[J].Proceedings of SPIE,2006,6342:1969-2101.
[11] PAISLEY D L,SWIFT D C,FORSMAN A C,et al.High-speed optical and X-ray methods for evaluating laser-generated shock waves in materials and the corresponding dynamic material response[J].Proceedings of SPIE,2001,4183:556-565.
[12] ZHANG X Q,ZHANG Y K,GU Y Y,et al.Experimental study on metal sheet of LD31 aluminum alloy shocked by intense laser[J].Journal of Huazhong University of Science and Technology(Natural Science Edition),2007,35(s1):139-142(in Chinese).
计量
- 文章访问数:
- HTML全文浏览量:
- PDF下载量:
下载: