Beam Failures
The Beam config has 2 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=Fcc/σx−1
with:
- σx : average axial stress as (Axial Force)/(Section’s area)
- Fcc=Fcy*(1−.272(L'
- : material compressive stress limit
-
- K_constraint = “constraint coefficient” on structural property. Def=0.0699
- : beam section’s radius of gyration
- E: material young’s modulus