Recent content by salamikorv

Im so confused on these solutions here for the shear stresses. Why is Tau_V sometimes negative and sometimes positive? Can someone please explain this and maybe illustrate? Here for example. Heres the solution for problem b): Here Tau_V (talking about F_xQ/(Ir) ) is negative, so how im...

@erobz alright fine, we can re-do it then.

I have this crane that has to be able to lift a weight of maximum 1000kg. Its a type of a manual winch crane thats going to be able to rotate. I need help with the rotating part, i want to determine the bearings inside this rotating part and im thinking to use 2 bearings in there but im not sure...

Hhahaha yeah but im pretty confident he hasnt done any mistakes. Look, i can discuss this with him later on but i came here to get help from the problems i got, and that is to determine the bolts. If you re-did the calculations and got something else thats fine, but im only for understanding how...

Im fine with the forces i have and what the studentassistant has told us, no offense by the way. I dont want to say my mates calculations are wrong since he has got alot of help from the assistants , if i asked for help of an exercise in my book with these information given would you just ignore...

What do you mean by an "unbalanced horizontal force"? Why cant you just assume the forces is right i dont really get this.

The beams are in static equilibrium since they are in rest state but yeah i guess with the pulleys its not in equilibrium once it starts to lift, when we stop the winch then its in static equilibrium.

1.5m to the left, i mean thats the length from the left end of the beam to the point where you drew the upward force, and 0.75m is the length thats left

Yes it is.

Oh alright. @erobz can you still help?

Yea its a school project, no its not for real life work. We get help from the studentassistents in the lectures all the time. They give us direct methods that we can use to make our parts, thats how i determined the bearings because its thanks to them. But ive been sick this week, still i am, so...

They are correct, the forces he got is correct as our supervisors has checked them for us. If you can assume they are correct, how do i get the bolt tension?

I can but i dont have time to set my mind into doing the calculations for the beams, using s235, finding out the stresses for it, its going to take alot of time its not that easy. Whats important for my part is to determine the right bolts, and he gave me the forces thats acting on the plate and...

My mate is responsible for the calculations of the beam, and he got that, so what i have for the bottomplate is this

Sorry for the late reply, theres only bending on that point, 15000Nm. So as you can see, the 20kN is in tension and then theres 30kN for the beam in the middle thats 30kN in compression. Do i use those to calculate the tension on each bolt or?