Mathcad - Empirical Equations 2

[EngineerRam]

Hi,

For all engineers who use Mathcad:

For example:

If I were to define fc := 4000psi

How would Mathcad perform the following function for the elastic modulus?:

57000(fc)^0.5

I know Mathcad is smart in terms of performing unit conversions seamlessly, but what about equations where a specific unit is required to obtain a desired result? Is there a way to "hardset" the input unit? Also, is there a way to "hardset" the output unit for empirical equations where the output units don't necessarily equal the input units (such as the formula for the elastic modulus)? Or would I need to apply a unit to the constant portion so that the units equal?

Thanks

 

[cnorvell]

Just multiply by the value 1 with whatever unit is needed to get the final units you need. For your case, I would multiply the equation by sqrt(1 psi), which would let MathCAD give you a result in psi.

 

[appot]

Just give units to 57000

 

[IRstuff]

would be the way I'd do it. This allows the equation to be used with whatever unit system you might use. So, you could input the quantity in psi and do the post-fix conversion to pascal or bar, for example.

TTFN
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[stevenspm]

I tend to just multiply fc by psi. So it looks like 57000*(fc*psi)^0.5, does the same thing as the method mentioned by IRstuff.