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Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@Kaustubh Katdare • 14 Apr, 2015
A missile (or a meteor) hitting the ground can cause a lot of destruction above the ground. The harder you hit, the more the damage; but that didn't apply to the earth-penetrating missiles. Simply hitting the ground harder to destroy the underground bunker has not been a very successful technique so far. Duke University researchers decided to find out what happens under the ground during the impact. The results of the study were published in Physical Review Letters, in which, the Duke team talks about their experiments and techniques developed to study high-speed impact in artificial soil and sand.

The findings of the experiment were very interesting. It was observed that the projectiles experienced more resistance if they hit the ground with more velocity. The research team demonstrated this using a metal projectile by dropping it from seven foot high ceiling into a pit of clear plastic beads. These bids transmit light differently when compressed and the team had to deploy high-speed cameras [40K frames/second] with polarising filters to study the impact. Take a look at the following photo captured by the camera:

Photos courtesy of Abram Clark.

The researchers found out that as the metal projectile struck the bed of pits, several force-chains got formed - similar to that of lightening bolt. The higher the speed of impact, the force-chains grew extensively causing the impact energy to get carried away from the point of strike quickly.

The study may help defence systems to build missiles that can penetrate the bunkers. The study was funded by the Defence Threat Reduction Agency. Read about the study on the source link below.

Source: DUKE
@Rajni Jain • 14 Apr, 2015 • 1 like With due respect to all the researchers, I am not sure if the experiment will holds good at all soil type or earth strata.

It's vibration that is making a sever impact below the surface, softer the upper soil, lesser would be the impact of this. This is only me, can someone expert in Geo flash some light on this?

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