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Impact Energy Dissipation through Force Chain Interruption

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Technical Report,01 Apr 2017,31 Jul 2018

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Purdue University West Lafayette United States

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Major Goals Granular materials are known to exhibit excellent shock and blast dissipation properties. They are also effective in stopping the high velocity projectiles. Sandbags have been used as fortification against impact and blast loading. Various penetration studies have been performed to assess the mechanisms that help in stopping the projectiles in granular materials. One of the important energy dissipation mechanisms in defeat of projectiles in sand is the fracture of particles in front of the projectile into very fine powder. Particles or granular solids of brittle materials are also subjected to compressive loading during materials processing, storage, handling, transportation, and usage. The dynamic compressive loading can lead to a wide range of deformation and fracture behaviors in the particles. In many particle size reduction processes such as milling, fracture of particles is desired to reduce the size of the particles efficiently. For some materials, small sub-particles resulting from the fracture of larger particles can be harmful to equipment and personnel. Silica dust resulting from fracture of polycrystalline silica particles can cause deadly lung diseases such as silicosis. Small particles diameter400 microns composed of many organic and inorganic materials are categorized as explosive dusts. There is a high likelihood of explosion when an ignition source is present in the vicinity of the explosive dusts. Improved understanding of the particle fracture mechanisms will be immensely helpful in improving the efficiencies of processes when the particle fracture is desired. On the other hand, better understanding of failure mechanisms will help in preventing particle fracture when the resulting fragments can be harmful. The aim of this study is to obtain the comprehensive understanding of the particle fracture processes undercompression.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Mechanics
  • Miscellaneous Materials

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