Hi guys,
when I said 12 bolts above for your maximum yield stregnth I am saying that you right now have 6 bolts on each side, i.e. a total of twelve.
The last little paragraph is just to give you an idea of the maximum yield stregnth that you would have if you had 12 bolt hubs connecting to the 12 bolt rotor.
I would definitely not weld the two together. It can be done if you heat each part to about 400 degrees and weld in small sections of about .5in in length. However, your penetration will be minimal and you would be asking for a lot of problems.
I don't see the hub breaking. The thing that tends to break in any system is the weakest part and bolts here are being torqued so just from geometry I would say that this is the weakest link.
Now, to determine force is simple. F= mass * acceleration.
I always do things in SI units so the units of mass are kg and the units of velocity are meters/second.
To determine acceleration take the velocity and divide it by the amount of time (in seconds) that you expect to go from max speed to zero speed.
For example, above 150kmph =~42 meters/second. I assumed stoppong time of 1 second. That gives acceleration = 42 m/(s^2)
I took mass times accel/ and got the Force = 546,000N.
So if you stop in 5 sec it would be 42/5~ 8.3 m/(s^2), which gives F= 107,000 N.
So stopping times matters a lot, however, as an engineer trying to give advice about a mechanical system breaking I would go with the worst case scenario and evaluate that.
I know that adding trailer brakes and rear brakes will absorb some of the load, the question is however, to again evaluate the worst case. When you do you realize that the engineers in Detroit designed the modern rotrs to bolt to hubs with 12 bolts because of higher highway speeds and increased mass.
Hope that helps,
54Monster
