Discussion
A laminate has \( 8 \) plies at zero and \( 8 \) at ninety degrees, stacked as four zeros, eight nineties, four zeros. This laminate is
Answer: C
Correct answer: Symmetric and balanced
Reading from one face: four zeros, eight nineties, four zeros. The sequence is its own mirror image about the midplane, so it is symmetric and the B matrix vanishes. It is also balanced, since every off-axis ply is matched by one at the opposite angle - and 0 and 90 degree plies are their own opposites, so a cross-ply laminate is balanced automatically.
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