Question: During the development of a short fibre reinforced polymer, material w

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Question: During the development of a short fibre reinforced polymer, material which must be processable by, for example, injection moulding, it turns out that the final product has insufficient strength. The material is strengthened by the addition of short fibres. A study shows that the fibres are shorter than the critical fibre length. Which modification of the material is obvious to try? The critical fiber length, lc, is given by: ofd where * is the fibre tensile strength, d the fibre diameter and rc the fibre matrix bond strength. a) b) c) d) Replace the fibres with an equal amount of thicker fibres? Replace the fibres with an equal amount of shorter fibres? Replace the fibres with an equal amount of longer fibres? Replace the fibres with the same amount of another type of fibres with higher tensile strength but the same diameter, length and bond strength to the matrix?

Explanation / Answer

Shorter fibers with proper orientation composites that use glass,

ceramic or multi-purpose fibers can be endowed with considerably higher strength than those

that use continuous fibers. Short fibers are also known to their theoretical strength.

By addition of short fiber critical length increse by the given formula strength of the fiber increse.

Option c is the best among them.

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