A few simulation questions..

[andrewkeisler]

Running a static simulation, using a force, and showing von mises results (or any other kind that I have tried) the von mises PSI barely changes when selecting different materials. Say 6061t6 and then running 7075t6 the PSI difference is a few percent at best. In my mind, the difference should around 100 percent since then yeild and ultimate strength or 7075t6 is is almost double that of 6061t6.

Second question. I am simulating a spindle that consists of 4 peices that all have a press fit and bolt together through the back sides. When adding bolt connectors to the spindle assembly and selecting no penetration, the results are not very accurate. The "RED" stress area is on the edge of where the bolts enter the threads. The press fit bosses should lessen the stresses on the threads but I havent found a way for the bolts to work in hand with a press fit application. Running the test without connectors and bonded is not 100 percent accurate either. Is there a way to show a ultimate strength simulation? That would be very beneficial and would possibly allow me to keep using the bolt connectors.

Thanks in advance guys!

Andrew

 

[NickE]

Question one is answered in the other thread.

thread559-336192



Nick

 

[avantibngrant]

Hi Andrew. A real way to see the answer to question one is to imagine a weight hanging on a rod. The stress is force/area. If I change the material to aluminium from steel, the stress still follows this formula, independent of the material stiffness. The deflection will however be 3 times as much as the stiffnes is one third. This applies in the linear area of the stress strain curve which the linear analysis work in.
Regards

Neil