Discussion
Assertion (A): Composite design allowables are quoted for a hot and wet condition.
Reason (R): Absorbed moisture and elevated temperature together soften the matrix.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the physics. Absorbed moisture plasticises the polymer matrix and lowers its glass transition temperature, and elevated temperature softens it further, so the two act together. Since matrix-dominated properties - compression, shear, bearing - suffer most, allowables are quoted at the worst credible combination of the two.
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