Bilinear plasticity

Step 4 — Controlled plasticity

TB,BISO,1,1
TBDATA,1,250E6,0    ! Sy = 250 MPa, tangent = 0 (perfectly plastic)

Repeat the ramp with NLGEOM,ON. Compare uy_plastic against uy_geom: plastic_dev_ratio must be ≥ 5%. Document whether yielding amplifies deflection beyond the geometric effect alone.

Step 5 — Read convergence in .out

Minimum checks before accepting results:

1. n_converged = n_substeps in POST1.
2. No unresolved “Solution not converged” lines.
3. Global equilibrium < 0.5% in all three cases.
4. Curve with 10 points in m10_load_curve.csv.