Discussion
If the stiffener stress in that panel rises from \( 200 \) to \( 320 \) MPa, the effective width becomes nearest to
Answer: B
Since the width varies inversely with the square root of stress, the factor is \( \sqrt{200/320} = \sqrt{0.625} = 0.79 \), giving \( 71 \times 0.79 = 56 \) mm. The structure grows progressively less efficient as it approaches its ultimate load.
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