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Which one of the following statements about “composites” is true?

A) Typical examples of composites are Fibre Reinforced Polymers (FRP) and metal alloys.
B) In FRPs the resin’s functions are to support and protect the fibres, and to transfer the loads
from fibre to fibre.
C) In FRPs the fibres are responsible for the strength of the composite in all directions.
D) In FRPs the fibres and resin both contribute (more or less equally) to the stiffness of the
composite.

1 answer

The correct statement about composites from the given options is:

B) In FRPs the resin’s functions are to support and protect the fibres, and to transfer the loads from fibre to fibre.

Explanation of the other options:

  • A) This statement is incorrect because while Fibre Reinforced Polymers (FRP) are indeed composites, metal alloys are not considered composites; they are typically classified as homogeneous materials.

  • C) This statement is misleading; while fibres provide significant strength in the direction of the fibres, they do not provide strength in all directions. The strength in various directions depends on the arrangement and type of fibres used.

  • D) This statement is incorrect as well; generally, the fibres contribute significantly more to the stiffness of the composite than the resin. The resin is primarily there for bonding and protecting the fibres, whereas the fibres are what provide most of the structural properties.