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University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2013
For externally pressurized vessels (e.g. a submarine hull) the foregoing stress formulas should be used with extreme caution, becauseanother failure mode comes into play:
Instability due to wall buckling
Buckling is covered in Part 4 of this course
Warning
University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2013
Digression: “Arrow Conventions” for Forces, etc
Are these equivalent?
Yes, and unambiguous
University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2013
How About This One?
What does it mean?
Hard to say beforehand. Depends on convention(s).Best is to avoid “double negatives” in technical work
University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2013
Double Negatives are Ambiguous ...
You aint’t going nowhere
Does it mean You are not going anywhere or You are going somewhere
A. It depends on context