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What happens to the stress distribution in a thin-walled pressure vessel as the ratio of its diameter to wall thickness increases?

59. What happens to the stress distribution in a thin-walled pressure vessel as the ratio of its diameter to wall thickness increases?

1. Stress becomes more uniform
2. Stress concentration decreases
3. Axial stress becomes predominant
4. Hoop stress decreases

Answer

The correct answer is: D) Hoop stress decreases

Explanation

Stress concentration decreases as the vessel's diameter-to-wall thickness ratio rises because the stress distribution becomes more uniform along the wall thickness. The preponderance of hoop stress in thin-walled pressure vessels is unaffected by this, though.