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Sandwich panel: This is another type of layered composite.
It consists of 5 layers: 2 layers are of faces, 2 layers are of adhesives & 1 middle layer is of core.
Faces: faces are formed by two strong outer sheets.e.g. Titanium, Steel, Aluminium alloys, plywood & fiber reinforced plastic material
Core: this layer is of less dense material.e.g. synthetic rubber, foamed polymer & inorganic cementing material.
All above layers are joined together with adhesives.
Faces are capable of bearing transverse bending stress. The core performs functions related to structural properties:
- Separation of faces from each other
- Resisting deformation perpendicular to the face plane
- Providing certain degree of shear rigidity.
Honey comb structure: This contains thin foils forming interlocked hexagonal cells with their axis oriented at right angles in the direction of face sheet.
Properties:
- Excellent dimensional stability
- Resistant to abrasion & corrosion
- High tensile strength
- Low stability
- High electrical modulus
Applications: It is used for making air crafts for wings & also used in roofs, walls & floor of building.