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Does anybody know what is wrong with this calc? The units should be psi or ksi. What is this gobbleydigook unit?
The only variable you haven't specified is Db. Assuming that's a diameter (linear dimensions, and checking units I get
When you get funky units like this it means that something in your expression isn't what you think it is.
In your equation, notice that "k" is green. This is the default formatting for constants. "k" is a built-in constant:
Instead of "k", I assume you intend to use your user-defined variable, "k_"