Verifiable challenge — The linearity test
Before modifying anything, predict what will happen when the load is duplicated:
F,ALL,FY,-2000/n_tip- Run the case of −1000 N and record the vertical displacement of the end.
- Only change the total force to −2000 N.
- Run again with the same geometry, material and mesh.
- Compute
uy_2000/uy_1000.
Acceptance criterion: ratio between 1.99 and 2.01.
In a linear elastic analysis, doubling the load doubles displacements and stresses. The ratio is more informative than comparing two contour screenshots.