Hi,
Does anyone know how to determine what the fatigue strength reduction factor should be for a fatigue analysis of a part or assembly? I have read the help files both in the tech support section of the ptc web site, and by going through the help files in Pro, and have found nothing helpful at...
To israelkk:
We had the shaft analyzed at a lab, and they said it was a ductile fracture due to overloading. My problem right now, it that our shaft is undergoing bending and twisting, and I am having a little trouble bring the two together to figure out to what torque I should limit this shaft...
Ok...I can admit when I am stumped...and I am stumped...I am not sure how to to this analysis considering dynamic loading. Right now, I am using the maximum torque from the gear box, and then using the torsion formulas from my old Solid Mechanics notes. So I have:
(Torque)/(Second moment of...
The shaft is loaded while turning. We have actually had on brittle fracture failure, and the machine while being tested this week appears to have failed again, however we will not know until the machine is taken apart this afternoon. We are changing shaft materials from SS 440 C to PH 17-4...
This part is a shaft that is being driven by a gear box-servo motor combination, and it is made of SS 440C with between 52-54 Rc. We originally wanted to make this shaft from SS 440F but that was not available, so then we asked for SS 440C with 60 +/- 1 Rc, but the supplier gave us what I...
The material is 304 stainless steel. This hole is drilled into the bottom left hand corner of a rectangular part, and this part is 15"x 24" x 6". Just to clarify, this is a sand cast part, and the hole is not completely drilled, it is just ground to a finish after casting to the...
Hi everyone,
I have a part that was manufactured improperly, and I need to fix it as quickly as possible. Basically, we had a through drilled through our part that was 1.875" in diameter, and then a from the center of this part out in two directions, the hole was enlarged to 1.90"...
I was wondering if anyone could possible suggest a good supplier in the area of toronto/kitchener/waterloo region who could make a 16 mirror finish on several parts I am designing. Also I was wondering if anyone knows a way I could manufacture a part with this surface finish myself, and...
Does anyone have any comments with regards to using one shaft instead of two? To be totally honest, I don't want to put my trust in loctite. These two parts, should they fail for any reason (ie. the loctite fail), would take several hours to replace. I do not see how the single shaft could...
Hi prex,
I am actually not in charge of the design, only in charge of the calculations. My boss feels that using all three of these methods of attaching the shafts is best, I am just trying to make sure it will work. I was wondering, in the equation you sent me, what does n represent?
Thanks...
Thanks guys.
I was feeling very discouraged that I could not figure this problem out, but it is encouraging to find that it is as difficult as I first thought. I have very little information that helps me. I do have the torque that the motor supplies, it is 40 N-m. Then, because of the gear...
Does anyone know how to calculate the following. I am going to be assembling two shafts together using a shrink fit, coating the interior of the two shafts with loctite, then welding the mating point of the two shafts with a fillet weld. The outer shaft will be attached at the bottom to a gear...
I was wondering if someone could give me an approximate value for the coefficient of friction between two steel parts rubbing against each other. The first steel part is made of SAE 4140 and is not treated. The second steel part is made of hardened steel. If anyone has a value or knows where...
