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Related Experiment Video

Updated: Apr 26, 2026

Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity

Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity

Published on: December 11, 2014

Shooting in a foam.

Anne Le Goff¹, David Quéré, Christophe Clanet

¹PMMH, UMRS 7636 du CNRS, ESPCI, 75005 Paris, France.

|July 29, 2014

Summary

This summary is machine-generated.

A solid sphere impacting liquid foam shows two deceleration behaviors. Initially, the foam acts as a viscous fluid, then transitions to an elastic response below a velocity threshold, enabling projectile stopping.

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Area of Science:

Materials Science
Fluid Dynamics
Rheology

Background:

Understanding the behavior of foams under impact is crucial for applications involving protective materials and projectile interception.
Liquid foams exhibit complex rheological properties that deviate from simple Newtonian fluid models.

Purpose of the Study:

To investigate the deceleration dynamics of a solid sphere impacting liquid foam.
To identify and characterize different regimes of foam behavior during impact.
To model the foam's response using a visco-elasto-plastic approach.

Main Methods:

Experimental study of solid sphere motion after impact on liquid foam.
Measurement of sphere velocity and identification of deceleration regimes.
Application of a visco-elasto-plastic model for foam rheology interpretation.

Main Results:

Two distinct deceleration regimes were observed: a high-velocity viscous regime and a low-velocity elastic regime.
A critical velocity threshold was identified, marking the transition between viscous and elastic foam behavior.
The visco-elasto-plastic model successfully described the observed foam rheology.

Conclusions:

Liquid foam exhibits both viscous and elastic properties depending on the impact velocity.
The identified velocity threshold is key to understanding foam's energy dissipation capabilities.
The study provides insights into the potential of foam for stopping projectiles and evaluating capture efficiency.