5. Rheology of foams
5.1 Essential properties of mosses
Under low stress, foam behaves like a solid. It is assigned an elastic modulus G, which is a function of bubble size and humidity. For example, for detergent foam, this modulus is of the order of 10 Pa, whereas it is 8 · 10 10 Pa for steel. The value of the elastic modulus for detergent foam is low, as it is a surface property due to surface tension.
If sufficiently high stresses are applied, topological changes occur which are no longer immediately reversible. The foam gradually becomes plastic. Beyond a stress threshold τ y , the foam behaves like a liquid, "flowing" (figure
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Rheology of foams
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