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Highly porous materials, such as honeycombs, foams and fibrous structures, are an important class of material in both synthetic and biological systems. They are used in many different ways, but their mechanical behaviour is often of great importance as they are pressed, bent, sat on or chewed. An important class of these materials can be considered as made up of cells, so-called cellular structures. Here we describe how these materials deform, elastically and irreversibly.

	Aims Before you start Introduction Compression of a honeycomb: Experimental Elastic behaviour (I) Elastic behaviour (II) Yielding and plateau behaviour Densification Other porous structures Porous structures in bending Summary Questions Going further
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First created: January 2007. Links updated: January 2008.