Dynamic compression characteristics of aluminium powder

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (19) : 231-236.

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

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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

Key words

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

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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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