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apparently I have to write stuff, but the subject line says it all ... what happened to "my groups" ? where is the "Round Table" ? ... found it !

and I suspect you changed the positive sign convention of one of Fin or Fout ... forget it, just being a dick ... ask Frank Burns said "I didn't come here to be liked", reply "you came to the right place". "Wir hoffen, dass dieses Mal alles gut gehen wird!" General Paulus, Nov 1942, outside...

being snarky (!!??) I'm surprised the answer is not negative. The OP has shown both Fin and Fout positive in the same direction. I can see that the problem can be expressed as three unknowns (RL, RR, and Fout/Fin) and three equations of equilibrium so statically solvable, and by solving this...

Ok, I thought the links described a fatigue test quite well. 1) you need a test article (got that), that needs to be conformed to some set of engineering. You may want to install s/gauges to collect data at either control points (to verify the loading and your FEM) or at points where you have...

that is a great link for solving this problem "Wir hoffen, dass dieses Mal alles gut gehen wird!" General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

have you tried to help yourself ? have you google "fatigue test methodology" ? there's lots of material available, but probably nothing that does all the work for you !? Is this for certification, or "only" commercial/company testing ? If for certification, talk to your local people (I have...

no, we consider moments about a point. Torque here is Mz. Torque about the RH support includes the LH reaction. But I don't think we can solve the structure with equations of equilibrium, because it is a mechanism (because it lacks the diagonal member). If we try to build a force polygon...

notice the upper cross beam (the center of this issue, I think) has the upper cap cut away at the end, so unlikely to act as a fixed end beam, so now we have a web bending under the offset load (the original thought) so stiffening webs should help the bending of the web. nothing will help the...

if the projected area of the two is the same, then the pressure load is the same. "Wir hoffen, dass dieses Mal alles gut gehen wird!" General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

"Torque=17.375*Finput=23.375*Foutput" ... I don't think you can say this, as you're taking torque about different points (Fout about the RH support, Fin about the LH support). I think you should sum torque about a point, like the RH support, so Fout*23.375 = Fin*(<17.375)+RL*(<12). "Wir...

are we taking bets on when this'll turn up in the "engineering disaster" forum ? "Wir hoffen, dass dieses Mal alles gut gehen wird!" General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

"delta_theta" means a change change in theta ... rotate the links to a slightly different angle (like change the 90deg at the RH support to 80 degrees ... how does the other two link move ?) summing torque about the point of intersection (good idea) you get RL*25.5707(?) = RR*32.2326. for static...

yeah we call them "influence lines" for solving redundant structures, see https://eng.libretexts.org/Bookshelves/Civil_Engineering/Structural_Analysis_(Udoeyo)/01%3A_Chapters/1.09%3A_Influence_Lines_for_Statically_Determinate_Structures but TLDR, sorry. "Wir hoffen, dass dieses Mal alles gut...

is there not an x component in the LH reaction ? "Wir hoffen, dass dieses Mal alles gut gehen wird!" General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

I think, rather than a FBD, you need to do a kinematic model. The bottom two points are fixed, the upper two points move. You may need to static equilibrium of different positions, but then these are static equilibrium views of a non-static structure (so there is some energy in the rotating...

not my field (so tell me to shut up) ... 1) is that small transverse beam fixed onto the larger beam ? I know we'd normally assume pinned (conservative for the beam, not so conservative for the end attachments). That would push more torsion into the joint. 2) what sort of shear is being...

I too haven't heard this term in the past ... can you post the section in the text where they describe it ? what is that sketch to the right of the beam ... another set of loads ? the question mentions "moving system of forces" ... ?? What is Q'2 ? maxmk1 ? (max moment @ k1 ?) what are the...

ok, could've been simplistic sketching. So there'[s a medium between the applied force and the curved surface, so the pressure is normal to the surface, equivalent to the applied load. Still not getting the ball thing ... 1) "The ball half under water" ... so buoyancy and weight balance the...

pressure acts normal to the face (unlike your 2nd pic). the force created by the pressure is any direction depends on the projected area normal to that direction. I don't understand "If instead of the curved surface, if we take a ball of the same diameter," ... do you mean if we submerge a...

the surface area is different, but the projected area normal to the pressure is the same. "Wir hoffen, dass dieses Mal alles gut gehen wird!" General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.