1 ACCEPTED SOLUTION
Accepted Solutions
Guess I just found a way to open P31 files in P30 (at least partially)
From what I see you first define a constant sigma.UTS and later you overwrite that value with a function of the very same name.
The function definitely should have a different name (I just added an underscore).
When I plot your function I see that there is a solution around 100 Delta°F, not 950
So maybe you used a different function in Excel.
While the symbolics still would not find an exact solution, the numeric root command does its job without problems:
Guess a solve block with "find" would do the job as well.
Guess I just found a way to open P31 files in P30 (at least partially)
From what I see you first define a constant sigma.UTS and later you overwrite that value with a function of the very same name.
The function definitely should have a different name (I just added an underscore).
When I plot your function I see that there is a solution around 100 Delta°F, not 950
So maybe you used a different function in Excel.
While the symbolics still would not find an exact solution, the numeric root command does its job without problems:
Guess a solve block with "find" would do the job as well.
The symbolic solver has its merits when it comes to solving equations with unknown variables symbolically. But it also had its limits. While it would normally switch to a float/numerical mode when it does not find an exact symbolic solution, it did not in case of your equation. Not sure why - it may have to do with the units as the symbolics is in no way unit aware. so ksi and Delta°F are treated as unknown variables.
When I remove the units and just solve for exponent=0 I get the five numerical solution of this fith order polynomial and one of them ist the 96.42 which we found via the root command.
So I would suggest that as long as you are just after a numerical solution you use a numerical method like root or a solve block with Find.
