Discussion
Consider the following statements about composite environmental effects:
1. Absorbed moisture reduces matrix-dominated properties.
2. Elevated temperature compounds the effect.
3. Fibre-dominated tensile strength is affected as strongly as matrix properties.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: moisture plasticises the matrix and temperature compounds the effect. Statement 3 is wrong, and the distinction matters for design. Fibre-dominated properties such as longitudinal tensile strength are barely affected, so the hot-wet knock-down bears on compression, shear and bearing rather than on tension along the fibres.
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