铝粉动态压缩动力学特性研究

邓永兴1,陆晓霞1,李磊1,徐松林2,苗春贺2

振动与冲击 ›› 2022, Vol. 41 ›› Issue (19) : 231-236.

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PDF(1936 KB)
振动与冲击 ›› 2022, Vol. 41 ›› Issue (19) : 231-236.
论文

铝粉动态压缩动力学特性研究

  • 邓永兴1,陆晓霞1,李磊1,徐松林2,苗春贺2
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Dynamic compression characteristics of aluminium powder

  • DENG Yongxing1, LU Xiaoxia1, LI Lei1, XU Songlin2, MIAO Chunhe2
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摘要

为得到韧性粉末在动态压缩下的力学行为,采用分离式霍普金森压杆(SHPB)对微米级铝粉进行了不同加载条件下的动态压缩实验。利用高速摄像机和红外测温系统(ITMS)分别记录散斑场的发展和动态加载过程中铝粉试样的表面温度。从10-4 s-1到3600 s-1应变率范围内,铝粉应变率效应明显。数字图像相关法(DIC)结果表明,试样整体变形不均匀,压缩前期试样压实由颗粒平动主导,后期转变为颗粒旋转和滑移主导。ITMS结果表明,与固体材料温升特性不同,加载后铝粉试样的辐射温度仍然上升。在铝粉试样中,由于有大量孔隙,颗粒在应力波驱动下加速运动,冲击能转化为颗粒动能,试样进一步压缩后,孔隙减少,颗粒运动受到限制,动能转化为颗粒内能,试样温度升高。
关键词:铝粉;分离式霍普金森压杆;数字图像相关法;红外测温

Abstract

In order to obtain the mechanical behavior of ductile powder under dynamic compression, dynamic compression experiments of micron aluminum powder under different loading conditions were carried out by using split Hopkinson pressure bar (SHPB). A high-speed camera and an infrared temperature measurement system (ITMS) were used to record the development of the speckle field and the surface temperature of the aluminum powder samples, respectively. In the strain rate range from 10-4 s-1 to 3600 s-1, aluminum powder has obvious strain rate effect. The results of digital image correlation (DIC) show that the deformation of the specimen is not uniform, and the compaction of the specimen is dominated by particle translational motion in the early stage of compression, but by particle rotation and sliding in the later stage. ITMS results show that the radiation temperature of aluminum powder samples still rises after loading, which is different from that of solid materials. In the aluminum powder sample, due to a large number of pores, the particles accelerate under the drive of stress wave, and the impact energy is transformed into kinetic energy of particles. After further compression of the sample, the pores reduce and the particle movement is restricted, and the kinetic energy is transformed into internal energy of particles, and the temperature of the sample increases.
Key words: aluminium powder; Split Hopkinson pressure bar; Digital image correlation method; Infrared temperature measurement
 

关键词

铝粉 / 分离式霍普金森压杆 / 数字图像相关法 / 红外测温

Key words

aluminium powder / Split Hopkinson pressure bar / Digital image correlation method / Infrared temperature measurement

引用本文

导出引用
邓永兴1,陆晓霞1,李磊1,徐松林2,苗春贺2. 铝粉动态压缩动力学特性研究[J]. 振动与冲击, 2022, 41(19): 231-236
DENG Yongxing1, LU Xiaoxia1, LI Lei1, XU Songlin2, MIAO Chunhe2. Dynamic compression characteristics of aluminium powder[J]. Journal of Vibration and Shock, 2022, 41(19): 231-236

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