Energy absorption in a bamboo foam
"Energy absorption in a bamboo foam"
A. Le Goff, L. Courbin, H.A. Stone, and D. Quere
Europhysics Letters 84 36001 (2008)
Soft Matter Keywords
bamboo foam, surface tension, energy absorption, Weber number
This article presents experiment and simple theory for the interaction between projectiles and thin films. The authors perform experiments on an idealized bamboo foam, observing that such a foam is capable of absorbing energy from a projectile passing through the foam, eventually bringing the projectile to rest. The authors also study the deflection of a projectile by a film oriented obliquely to the projectile's trajectory. For both studies, simple scaling arguments are developed that capture the main features of the film/projectile interaction.
Practical Application of Research
Foams are under consideration for use in systems designed to absorb kinetic energy from projectiles. These systems are deployed to protect internal contents, people, precious objects, and other fragile items. Foams present an attractive option because they are light, simple and fast to form, and inexpensive. This work shows that foams are capable of absorbing kinetic energy from projectiles and will eventually arrest them. Though not immediately practical, this work with ideal foams opens up the way for future studies of projectile interaction with real foams. The initial work to characterize projectile interaction with bamboo, staircase, and oblique foams will contribute to the understanding of interaction with real foams.
Projectile Interaction with Foams
written by Donald Aubrecht