Designing and optimizing materials capable of efficiently dissipating energy upon impact is critical to ensure safety in various engineering applications. Density-varying cellular materials exhibiting compaction shock under high-speed impact loading have emerged as an excellent choice for impact mitigation. While theoretical and numerical examinations of density-graded cellular materials under dynamic loading have been extensively explored in various studies, there is a noticeable scarcity of experimental research in the existing literature. The present study delves into the force transmission and energy absorption of density-varying cellular materials to address this gap. Cellular materials with middle-high and middle-low density distributions are fabricated with controlled variations in density using additive manufacturing. Advanced experimental techniques, including high-speed imaging and force measurement, are employed to characterize their impact resistance. It is observed that the energy absorption rate depends on the density variation of the specimen. In addition, the middle-low specimen demonstrated a lower overall peak force than the middle-high specimen.

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Impact Resistance of Cellular Materials with Varying Density

  • Vijendra Gupta,
  • Addis Kidane

摘要

Designing and optimizing materials capable of efficiently dissipating energy upon impact is critical to ensure safety in various engineering applications. Density-varying cellular materials exhibiting compaction shock under high-speed impact loading have emerged as an excellent choice for impact mitigation. While theoretical and numerical examinations of density-graded cellular materials under dynamic loading have been extensively explored in various studies, there is a noticeable scarcity of experimental research in the existing literature. The present study delves into the force transmission and energy absorption of density-varying cellular materials to address this gap. Cellular materials with middle-high and middle-low density distributions are fabricated with controlled variations in density using additive manufacturing. Advanced experimental techniques, including high-speed imaging and force measurement, are employed to characterize their impact resistance. It is observed that the energy absorption rate depends on the density variation of the specimen. In addition, the middle-low specimen demonstrated a lower overall peak force than the middle-high specimen.