Design for creep with metal foams

Creep of metals, and of foams made from them, becomes important at temperatures above about one third of the melting point. The secondary, steady-state strain rate e depends on the applied stress, a, raised to a power n, typically 3 < n < 6. The time to failure, tr, is roughly proportional to the inverse of the steady-state creep rate, that is, tre ^ C, where C is a constant. In this chapter the results of models for power-law creep of foams are summarized and the limited experimental data for the creep of metallic foams are reviewed. The creep of metallic foams under multiaxial stress states is described. The results allow the creep of sandwich beams with metallic foam cores to be analysed.

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