Metal foam obliterates bullets

Re:Metal foam obliterates bullets by the8472 on Sunday April 10, 2016 @10:21AM (#11466201)

There's a 4th layer: The whole thing is vacuum-wrapped in epoxy-fiberglass composite to catch spall.

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Re:Metal foam obliterates bullets by rattray on Sunday April 10, 2016 @01:16PM (#11467123)

Because I imagine I wasn't the only one with no clue what "spall" was:

> Spall are flakes of a material that are broken off a larger solid body and can be produced by a variety of mechanisms, including as a result of projectile impact, corrosion, weathering, cavitation, or excessive rolling pressure (as in a ball bearing)

https://en.wikipedia.org/wiki/Spall

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Re:Metal foam obliterates bullets by nkozyra on Sunday April 10, 2016 @02:09PM (#11467408)

Odd that the video doesn't seem to catch spall then.

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Re:Metal foam obliterates bullets by tyingq on Sunday April 10, 2016 @03:13PM (#11467669)

Catching spall on the back side of the barrier is the important bit.

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Re:Metal foam obliterates bullets by cellularmitosis on Sunday April 10, 2016 @08:52PM (#11469001)

Why? Does the spall have enough energy to hurt someone?

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Re:Metal foam obliterates bullets by iSnow on Monday April 11, 2016 @01:49PM (#11473596)

jagged splinters with sharp edges being ejected at high velocity - what could go wrong?

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