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Propulsion structural analyst Interview Questions

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When a hot dog expands, in which direction does it split and why?

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The stress in the circumferential/tangential direction is always larger than the stress in the axial direction, so it splits in long seams down its length rather than in hoops around its circumference. The equation for hoop stress is pr/t, whereas the equation for axial stress is pr/2t. It is a good exercise to derive these equations yourself.

To its weakest part

Splits lengthwise because the diameter is less than the length.

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What is a shape function?

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