Looks like @Boardnamics helped out here. Good discussion about structural analysis and loads on the hanger and shoulder bolt.
I enjoyed reading it. I will speculate (as he mentioned many do) about the impact energy that occurs momentarily when the wheels strike cracks or sudden obstructions. I believe this can be much higher than 200% above the static load. As velocity increases, so will the amount of energy required to stop the load moving. These are all likely circumstances where the rider would be tossed anyway. But I am suspiscious of the impact energy created when hitting a pot hole. All of the riders enegy goes down into the board and the front truck takes all of the momentum and mass as it absorbs the impact energy of the front and (hopefully) exit of the hole.
Struggling senior in mechanical engineer here, so take my word with a grain of salt and toss it out the window if you please, but I believe that with tight enough tolerances, the forces will be evenly distributed throughout the length of shoulder bolt, not pinpointed at the entry hole and end of the shoulder bolt. The greatest concern would come from where the shoulder bolt ends inside the truck, where it sees a very large moment and is likely the first thing to snap if forces on the wheel are too great.
wouldn’t the weight of the rider also cause deflection to the hanger we are not seeing here? Especially since the weight is centered on the hanger. So the hanger is already likely experiencing some deflection from that, with the weight 5-6 inches from the start of the axle.
If what youre suggesting is correct, then we should be evaluating against the tensile strength of 6mm, as that is the thread diameter and not the diameter of the shoulder.
They won’t once you account for the finite stiffness of the parts.
Note that no assumption was made about how it’s supported. That’s why contact elements are important, this stress distribution is the result
