Derived Results: Additional results based on user controllable constants

[JacobStoren]

The following two constants is supposed to be placed on the property panel of a GM Case:

s0 (cohesion) , default value = 10
fa (friksjonsvinkel) , default value = 30

Expression

SFI = ( ( s0/tan(fa) + 0.5_(SE1 + SE3) ) * sin(fa) ) /(0.5_(SE1-SE3))

[JacobStoren]

How do we handle fa = +- 90 deg and 0 deg ?

[lasserenli]

I suggesting limiting the range so that 0 < fa < 90 deg. Thus, trying to input fa <= 0 or = > 90 should provide a message saying something like allowed range is 0 < fa < 90 deg