Influence of Loading Rate on Fracture Strength of Individual Sand Particles

Druckrey, Andrew M.; Casem, Dan; Alshibli, Khalid A.; Huskins, Emily L.

doi:10.1007/978-3-319-41132-3_11

Cited by 3 publications

(2 citation statements)

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“…Conversely, we employed alumina spheres with suboptimal densification of the grains to promote the fragmentation into fine particulate matter because particles are useful for abrasion of the cutting disc. Notably clusters of small particles become more resistant to penetration under fast moving load due to the increase of their system level resistance under high strain rates 18 . In other words, our design did not attempt to prevent the material transformations but embraced them and selected the base materials to achieve the most favorable evolution of the constituents.…”

Section: Resultsmentioning

confidence: 99%

“…Our resistance mechanism was also likely benefiting from the strain rate effects of granular matter, which are known to increase the fracture toughness of particulate matter exponentially. The tensile strength of sand grains has been shown to double already at 15 m/s loading velocity 18 . Sandbags that are encountered in conflict zones are effective in stopping bullets mainly due to the strain rate enhancement.…”

Section: Discussionmentioning

confidence: 99%

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Non-cuttable material created through local resonance and strain rate effects

Szyniszewski

Vogel

Bittner

et al. 2020

Sci Rep

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We have created a new architected material, which is both highly deformable and ultra‐resistant to dynamic point loads. The bio-inspired metallic cellular structure (with an internal grid of large ceramic segments) is non-cuttable by an angle grinder and a power drill, and it has only 15% steel density. Our architecture derives its extreme hardness from the local resonance between the embedded ceramics in a flexible cellular matrix and the attacking tool, which produces high-frequency vibrations at the interface. The incomplete consolidation of the ceramic grains during the manufacturing also promoted fragmentation of the ceramic spheres into micron-size particulate matter, which provided an abrasive interface with increasing resistance at higher loading rates. The contrast between the ceramic segments and cellular material was also effective against a waterjet cutter because the convex geometry of the ceramic spheres widened the waterjet and reduced its velocity by two orders of magnitude. Shifting the design paradigm from static resistance to dynamic interactions between the material phases and the applied load could inspire novel, metamorphic materials with pre-programmed mechanisms across different length scales.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%