Ladder frame chassis - conclusions
foglio maxima "ladder frame" a fine lezione del 7 marzo
foglio maxima "Channel section" a fine lezione precedente
estratto risultati foglio maxima "Channel section" lezione precedente
foglio maxima a fine lezione, limiti vari
foglio maxima a fine lezione, grafico dipendenza ts da spessore
command line for running Mentat
mentat2013.1 -ogl -glflush
Thin walled profile in torsion
Open thin-walled rectangular cross section profile (a longitudinal cut is performed at the lateral wall center line, whose kerf (width) is negligible), 120x40mm outer dimensions, 2mm wall thickness. (Dimensions at the midsurface: 118x38mm), element size ranging from ~10mm to ~20mm.
At the A cross section, a skew-symmetry material continuity constraint is applied.
The kinematic constraint at the B point (sphere in cylinder joint) is a positioning constraint, along with the $w_A=0$ axial constraint in A.
A twist per unit length equaling 0.001 radiant/mm is imposed to the profile, i.e. a $\psi_B=0.001 \cdot l$ (it was, erroneously, $\psi_B=0.0005 \cdot l$) rotation is imposed at each end, where $l$ is the $z$ axial coordinate of the endpoints, being z=0 at the skew-symmetry plane.
The reaction moment associated with the constraint will determine the applied torque $T$.
modello iniziale
model, as at the end of the April, 17 lesson
profile_in_torsion_x16_v004.mud
model, as at the beginning of the May, 2 lesson
profile_in_torsion_l01_r01_open_v004.mud
profile_in_torsion_l01_r02_open_v004.mud
profile_in_torsion_l01_r04_open_v004.mud
spreadsheet for the analysis of the results
foglio_di_calcolo_rigidezza_torsionale_trave_ffcd2018_v002.ods