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Core Materials

  • Thursday, 24th January 2019
  • Reading time: about 2 minutes

Engineering theory shows that the flexural stiffness of any panel is proportional to the cube of its thickness. The purpose of a core in a composite laminate is therefore to increase the laminate’s stiffness by effectively ‘thickening’ it with a low-density core material. This can provide a dramatic increase in stiffness for very little additional weight.

The figure below shows a cored laminate under a bending load. Here, the sandwich laminate can be likened to an I-beam, in which the laminate skins act as the I-beam flange, and the core materials act as the beam’s shear web. In this mode of loading it can be seen that the upper skin is put into compression, the lower skin into tension and the core into shear. It therefore follows that one of the most important properties of a core is its shear strength and stiffness.

In addition, particularly when using lightweight, thin laminate skins, the core must be capable of taking a compressive loading without premature failure. This helps to prevent the thin skins from wrinkling, and failing in a buckling mode.

Published courtesy of David Cripps, Gurit

Polyurethane Foams

Specifically explaining “rigid polyurethane foam” in its two polymer types.

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PVC Foam

PVC foams are widely used core materials in the marine, surface transport, aerospace, and wind energy industries due to their consistent density, high moisture resistance, and excellent physical properties.

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Other Foam Cores

Explains PVC, polystyrene, PMI foams and other thermoplastics.

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Honeycomb Cores

Honeycomb cores are available in a variety of materials for sandwich structures.

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Wood Cores

Covers the two main types of wood used as cores - balsa and cedar.

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Other Core Materials

Highlights 'fabric-like' materials such as Coremat and Spheretex.

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Core Properties

Explains the shear and compressive strength of some core materials.

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