These structures of composite materials can not be fit into conventional particule-reinforced and fiber-reinforced composite material groups. Honeycomb, foam and laminar structures of composites are very different in structure, and in here, we explain these honeycomb, foam and laminar composite structures below.
Laminar Composite Structures
As you understand from its name, laminar composite structures are laminated structures of different materials or same materials to obtain much more better mechanical properties. In conventional composites, there are primary and secondary phases. But in this kinds of composite materials, there is no exact primary or secondary phases. Different materials mechanically brought together as laminae to ibtain required mechanical characteristics.
The laminated structure is visible by naked eye unlike other matrix-reinforcement composites.
Actually honeycomb and foam structures are the sub-groups of laminar structure composites. In foam structure, the core thich layer is produced from thermoset foams and other layers are added both side of core foam layer to obtain a stiff and strong material. With this technique, very good materials are produced in terms of strength/weight ratio.
The logic of honeycomb structure is like foam structure composites in which the core of material is produced from honeycomb shaped materials. Layers are added both sides of honeycomb structures to obtain a sandwhich shape, in which strength-to-weigth ratio is very important.
These laminar structures of composite materials are called as ‘sandwhich structures’ also.
Laminar Composite Examples
- Snow Skis: Snow skis produced in the laminar structure that includes metal layers and phenolic plastic layers.
- Windshield Glass: Glass layers are added to both sides of transparent plastic sheet.
- Fiber-reinforced Polymers: These layered fiber-reinforced materials find various applications such as boat hulls and aircraft applications.
- Plywood Applications: Sheet structures that are produced from wood parts are bonded together to obtain a stiff structure.
- Printed Circuit Boards: For electrical conductivity and insulation properties, layers of polymers and coppers are produced and bonded together.
- Tyres: Rubber reinforced carbon black and rubber impregnated fabrics are combined as laminar structure to obtain automotive tyres.
These are the general propreties and applications of laminar composite structures in engineering.
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