Discussion
A stringer of \( 250 \) mm\( ^2 \) has \( 71 \) mm of effective skin at \( 2 \) mm thickness on each side. Its total effective area is
Answer: C
Correct answer: 534 mm²
The stringer takes its own area plus the effective skin on both sides:
\[ A = 250 + 2 \times (71 \times 2) = 250 + 284 = 534 \ \mathrm{mm}^2 \]The skin contributes more than the stringer itself here, which is typical and is why the effective width calculation matters so much. Counting one side only gives 392, and omitting the skin altogether gives 250.
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