===== Ladder frame chassis - conclusions =====


{{ :wikifemfuchde2018:quarter_ladder_frame_v003.wxmx | foglio maxima "ladder frame" a fine lezione del 7 marzo}}

{{ :wikifemfuchde2018:channel_section_v006.wxmx |foglio maxima "Channel section" a fine lezione precedente}}

{{ :wikifemfuchde2018:channel_section_results.wxmx | estratto
risultati foglio maxima "Channel section" lezione precedente}}

{{ :wikifemfuchde2018:quarter_ladder_frame_v004.wxmx | foglio maxima a fine lezione, limiti vari}}

{{ :wikifemfuchde2018:quarter_ladder_frame_v005.wxmx | foglio maxima a fine lezione, grafico dipendenza ts da spessore}}

command line for running Mentat

  mentat2013.1 -ogl -glflush

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===== 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. 


{{:wikifemfuchde2018:analisi_sezione_a_torsione.png?nolink|}}
{{:wikifemfuchde2018:analisi_sezione_a_torsione.pdf |sorgente ipe}}



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

{{ :wikifemfuchde2018:profile_in_torsion_v000.mud |}}

{{ :wikifemfuchde2018:profile_in_torsion_v002.mud |}}

model, as at the end of the April, 17 lesson

{{ :wikifemfuchde2018:profile_in_torsion_x16_v004.mud |}}

model, as at the beginning of the May, 2 lesson

{{ :wikifemfuchde2018:profile_in_torsion_l01_r01_open_v004.mud |}} 

{{ :wikifemfuchde2018:profile_in_torsion_l01_r02_open_v004.mud |}}

{{ :wikifemfuchde2018:profile_in_torsion_l01_r04_open_v004.mud |}}

spreadsheet for the analysis of the results

{{ :wikifemfuchde2018:foglio_di_calcolo_rigidezza_torsionale_trave_ffcd2018_v002.ods |}}




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[[https://box.ing.unimo.it/owncloud/index.php/s/DDAaFPbfykHdaYG|Area stoccaggio file lezione corrente]]