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--- wikifemfuchde2019:lez_2019-05-29 [2020/06/04 06:37] – [spot welding on a thin walled profile in torsion] ebertocchi
+++ wikifemfuchde2019:lez_2019-05-29 [2020/06/04 06:39] (versione attuale) – [spot welding on a thin walled profile in torsion] ebertocchi
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+====== Singularities ======
+===== References =====
+review papers on stress singularity identification and characterization, GB Sinclair et al.:
+  * {{:wikipaom2016:sinclair_i.pdf|}}
+  * {{:wikipaom2016:sinclair_ii.pdf|}}
+  * {{:wikipaom2016:sinclair_et_al_practical_convergence_divergenze_checks_for_stresses_from_fea.pdf|}}
+===== FEM Examples =====
+==== Singular/nonsingular behaviour transition in a cantilever beam ====
+slight perturbations of the theoretical clamped/free limit angle
+{{:wikipaom2016:test_singolarita_clamped-free_v2005r3.mud|}}
+Figure 2d, p.6 sinclair_ii pdf, κ=2; actually plane strain, $\nu=0.3$, critical angle from eq. (2.19).
+==== A questionable ball bearing modeling for axle support ====
+{{:wikipaom2015:singolarita_cuscinetti_tensioni.gif?400|}}
+{{:wikipaom2015:singolarita_cuscinetti_cedimenti.gif?400|}}
+{{:wikipaom2016:singolarita_cuscinetti_dubbia_modellazione.mud| modello marc/mentat}}
+==== spot welding on a thin walled profile in torsion ====
+steel, 80x80mm square section, 2.5 mm thickness.
+modeled portion: 40mm in the axial direction, with 1 spot weld whose nominal diameter is 4mm.
+file:
+  * {{:wikitelaio2015:profilo_torsione_saldatura_punti_solomesh_v2012.mfd|}}
+  * {{:wikitelaio2015:profilo_torsione_saldatura_punti_completo_singolarita_v2012.mud|}}
+  * {{:wikitelaio2015:profilo_torsione_saldatura_punti_completo_rbe2_v2012.mud|}}
+where (sorry):
+  * "graffa" = flap
+  * "lamiera" = metal sheet
+  * "punto" = spot [weld]
+  * "superiore" = upper
+  * "inferiore" = lower
+  * ...