A new concept in design of materials and structures: Assemblies of interlocked tetrahedron-shaped elements

Dyskin, A.V.; Estrin, Y.; Kanel-Belov, A.J.; Pasternak, E.

Авторы: Dyskin A.V., Estrin Y., Kanel-Belov A.J., Pasternak E.
Журнал: Scripta Materialia
Номер: 44
Год издания: 2001
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 2689
Последняя страница: 2694
DOI: 10.1016/S1359-6462(01)00968-X
Аннотация: In this communication we propose a new material architecture based on regular assemblies of identical interlocked elements. The packing arrangement is such that each individual element is prevented from breaking out by its immediate neighbours. It is claimed that the existence of such interlocked assemblies opens up a new direction for creating special strong and flexible composite materials with high impact resistance. In conventional composites, the reinforcement particles are held together by a matrix or a binder phase. Consequently, the overall strength is restricted by the strength of the matrix no matter how strong the particles are. In principle, the strength of a composite could be increased if the particles were directly connected to each other. In this case, the matrix or the binder phase would only play the role of a ‘buffer’, inhibiting the propagation of dislocations or cracks from one particle to another. The matrix could also provide additional properties, such as thermal or acoustic insulation. Interlocking can, of course, be achieved by equipping reinforcement particles or building blocks with special locking ‘keys’ (this is particularly the case in the building industry, cf., e.g., self-locking bricks). Obviously, the ‘keys’ are stress concentrators that impose severe limitations on the overall strength of the structure, not to mention the additional technological difficulties associated with the manufacturing of blocks with ‘keys’. We propose a different approach to the production of interlocked structures. It is based on the use of the topological possibility of establishing self-locking in assemblies of simple convex shaped elements free of stress concentrators. In what follows, a particular example of an interlocked layer structure consisting of identical tetrahedron-shaped elements packed in a special way is discussed. The first results of mechanical tests done on an experimental specimen assembled according to this recipe are then presented. Finally, a brief outlook on new perspectives resulting from this novel approach to materials design is given.
Добавил в систему: Белов Алексей Яковлевич

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A new concept in design of materials and structures: Assemblies of interlocked tetrahedron-shaped elementsстатья

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