Derive an expression for the Young's modulus of a hierarchical open-cell foam, in which the cell walls are themselves foamed. Compare the Young's modulus of the hierarchical foam with that of an equivalent density simple foam with uniform cell walls.

Please express your answer in terms of C, the overall hierarchical foam density ρa∗, ρs, and Es.

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To derive an expression for the Youngs modulus of a hierarchical opencell foam where the cell walls ... View the full answer