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Volume 35 Issue 1
Jan 2021
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Chinese Journal of High Pressure Physics  > 2021  >  35(1): 014104.
ZHAO Bing, LI Dan, ZHAO Feng, HU Qiushi. Crushing Characteristics of 99 Alumina Ceramics under Different Strain Rates[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 014104. doi: 10.11858/gywlxb.20200606
Citation: ZHAO Bing, LI Dan, ZHAO Feng, HU Qiushi. Crushing Characteristics of 99 Alumina Ceramics under Different Strain Rates[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 014104. doi: 10.11858/gywlxb.20200606
shu

Crushing Characteristics of 99 Alumina Ceramics under Different Strain Rates

doi: 10.11858/gywlxb.20200606
  • 1.

    Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China

  • 2.

    National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621999, Sichuan, China

  • Received Date: 22 Aug 2020
  • Rev Recd Date: 15 Sep 2020
    Abstract
  • In this study, axial compression experiments of 99 alumina ceramics at different strain rates were carried out. After soft recovering of the fragments at the corresponding strain rates, and geometrical characterization of the specimen fragments by the sieve residue method, the fragment size distribution curves at different strain rates as well as the energy absorption process in the failure of the specimen were obtained, and the relationship between the external force of the granular ceramic and the relative crushing rate was also established. Digital image correlation (DIC) technology is used to obtain the strain field along the loading direction at different strain rates, and the failure mode is analyzed in combination with the energy absorption process and fragment grading performance. The results show that the fracture strength of 99 alumina ceramics is positively correlated with the strain rate. At the middle strain rate, the energy absorption rate has a negative correlation with the strain rate. Due to the change of the energy absorption mechanism, the sample was fractured at the beginning, but the failure mode became split-crushing mixed failure when the strain rate reached 401 s−1. With the strain rate increasing, the specimen became crushed and damaged. The average particle size decreases, the size of the fragments converges, and the influence of stress concentration gradually weakens. The relationship among energy, destruction process and fragment distribution was analyzed, and finally the fragment distribution law and fragmentation characteristics were obtained.

     

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