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M: Metallphysik
M 25: Material Design
M 25.3: Talk
Saturday, March 5, 2005, 15:15–15:30, TU H2038
Assembly and properties of single- and multilayer topologically interlocked structures made from cubic elements — •Stephan schaare1, Juri Estrin1, Arcady Dyskin2, Elena Pasternak2, and Han Chuan Khor2 — 1Institut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, Agricolastr. 6, 38678 Clausthal-Zellerfeld — 2School of Civil and Resource Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Topological interlocking is a novel concept for designing materials, in which elements of certain geometries are assembled in a special way to support each other and form an integral structure without the need for connectors or a binder phase. Geometric bodies which allow such an assembly into topologically interlocked structures are the five platonic bodies. We present assemblies of single- and multilayer structures of cube shaped elements along with the results of mechanical tests done on these structures, viz. quasistatic point loading and impact loading tests. Different kinds of materials and surface treatments were used for the cube elements. The results show that the properties of the structures strongly depend on the material and the surface condition of the individual elements, as well as on the lateral loading of the structure. The impact tests reveal enhanced energy absorption by the topologically interlocked structures. Also an unusual mechanical response in point loading tests was observed, in which the structures show a negative stiffness. These properties underpin both practical applications and theoretical significance of these novel structures.