Beam Failures
The Beam config has two subtypes: Beam_member and Beam_shell. The first is made of 1D
elements while the second points to freebody sections. Both configs come with their
flavor of the same actual methods:
 Stringer Axial Stress
 Stringer compressive buckling
The Stinger Axial Stress is a simple method which calculates the Compressive/Tensile margin of safety as:
MS= [(Compressive Stress limit)*(section Area)/(Axial Force)] 1; (resp. Tensile Stress limit)
In the case of freebody sections, Axial Force is mapped to the freebody resultant Fx.
The compressive buckling method evaluates
$MS={F}_{cc}/{\sigma}_{x}1$
with:
 ${\sigma}_{x}$ : average axial stress as (Axial Force)/(Section’s area)
 ${F}_{cc}={F}_{cy}*(1.272(L\text{'}/\rho )/\pi *\sqrt{E/{F}_{cy}})$
 ${F}_{cy}$ : material compressive stress limit

$L\text{'}=(\text{structural}\text{\hspace{0.17em}}\text{property}\text{}\text{}\text{\hspace{0.17em}}Length)/\sqrt{\text{K\_constraint}}$
 K_constraint = “constraint coefficient” on structural property. Def=0.0699
 $\rho $ : beam section’s radius of gyration
 E: material young’s modulus