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Indice
Progettazione Assistita di Organi di Macchina, primavera 2022
Lecture Notes
lecture notes, as of 2021-09-07 (big endian).
Planar beam structure i.p. and o.o.p. loadings
The beam structure centroidal axis lies on a plane, which is also a symmetry plane for the cross-sections.
Symmetric and skew-symmetric loads with respect to such a plane are called in-plane and out-of-plane loads, respectively.
If the superposition of effects holds (e.g., if the structure behaves linearly) each load set only induces an associated subset of the possible components of internal action, see
Symmetric and skew-symm. parts of a general load
A general load is applied to a symmetric structure in a); in b), c) the loads applied on each half structure is treated separately. In d), e) the action on the loaded portion is halved, and symmetrically propagated to the other portion; those symmetric actions are accumulated in the symmetric part of the load f). In g), h) the action on the loaded portion is halved, and skew-symmetrically propagated on the unloaded portion; those skew-symmetric actions are accumulated in the skew-symmetric part of the load i).
Rollbar-like frame
Maxima worksheets: v0001, v0003, v0004, v0005, v0006, v0007, controllo, v0008, v0009, v0010 - finale.
Quarter ladder frame chassis
quarter_ladder_frame_paom2022a.wxmx
quarter_ladder_frame_paom2022b.wxmx
quarter_ladder_frame_paom2022c.wxmx
quarter_ladder_frame_paom2022d.wxmx
struttura simil Halo
Other stuff
Principal orientations for beam flexure. This gif animation presents the axial stress component map as a function of the bending moment vector orientation, as evidenced by the rotating needle. It clearly appears that, for a generic (vs. e.g. circular) cross section, the neutral axis may significantly deviate from the moment vector orientation; those two directions become parallel only in correspondence of the principal directions for bending (located at [18.4°-18.5°]+N·90° for the cross section under scrutiny). The bending moment rotates of 0.1° each increment.
