Von Mises stress (Sv) is a good failure hypothesis for isotropic materials like metals. Accordingly, the structural member fails when the applied stress (Sa) is higher than Sv.
How do I retrieve Von Mises stress from Beam elements?
I´ve only found that BeamView and Utilization components are the ones that produce stress results. However, BeamView only provides Axial Stress and Utilization only gives the maximum axial normal stress in the most external fibers. Furthermore, the Utilizations output from Utilization component are always calculated according to EC3 (EN 1993-1-1), and thus, they´re only valid for structural steels.
Am I right?
How would I consider the axial forces (Nx), torques (My, Mz and Mt) and shear forces (Vy and Vz) to decide whether some beam will fail or not?
Here you have an example to play with: MyBeamTest2.gh (96.2 KB)
PS: Here you have an interesting video about both ductile and brittle failure theories Understanding Failure Theories (Tresca, von Mises etc...) - YouTube (in minute 12 it is evidenced how well Von Mises criteria fits experimental data).