Go to Post It is better to err on the side of caution than to put yourself in a position to have a referee or judge make a call against you. Build smart! - Sean Schuff [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #2   Spotlight this post!  
Unread 03-08-2007, 02:13
Kevin Sevcik's Avatar
Kevin Sevcik Kevin Sevcik is offline
(Insert witty comment here)
FRC #0057 (The Leopards)
Team Role: Mentor
 
Join Date: Jun 2001
Rookie Year: 1998
Location: Houston, Texas
Posts: 3,736
Kevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond repute
Send a message via AIM to Kevin Sevcik Send a message via Yahoo to Kevin Sevcik
Re: Calculating force to bend a rod?

Don,

If you're looking for a one-off, eFunda is the place.

Properties for your cross section are here.

Material properties are here and here.

Finally, the calculator for a simply supported beam is here.

I think you'd plug in a load until you exceeded the yield strength by a good bit. Problem being, you're specifically trying to yield it and that gets into the non-linear range of things that aren't as pretty.

The actual equations to figure the same thing aren't very bad, but it's 1am and I don't know if I'd need to cover everything from torques and moments up to the bending beam stuff or if I could skip ahead a few chapters.

Incidentally, first run the equation thing until you hit yield, then run it until you hit the ultimate tensile strength. UTS would be your worst case load.

Though now that I look at the numbers, I'm skeptical that this will work as you describe it. I think a bend of that radius will be stretching your 6061-T6 too much. Even if the bar only ends up about half as thick at the middle of the bend, with a radius of about 1.125 on the outside, you'd be stretching the outside by 50%, and the elongation at failure is only 12%. So I think you'd likely crack the outside of your rod before you're done. I suspect you'll need to increase your bend radius, heat the bend area, or both.

EDIT: Quick calc puts the answer around 800 lbs for yielding T6. Probably a bit more than half a ton to actually bend it. O stock, meanwhile, would be around 200-300 lbs and less likely to crack on you. Of course, you'd have to heat treat it after you bent it. On the whole, cutting a 45 bevel and welding the joint and strengthening brace sounds... well... about a half ton easier.
__________________
The difficult we do today; the impossible we do tomorrow. Miracles by appointment only.

Lone Star Regional Troubleshooter

Last edited by Kevin Sevcik : 03-08-2007 at 02:23.
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Animating a Bend Rob2713g Inventor 4 21-05-2007 12:28
Calculating relays. VEN Electrical 3 24-04-2007 22:23
Bend Radii Andrew Blair Technical Discussion 6 09-11-2005 10:21
Calculating Pneumatic Force Paradox1350 Pneumatics 4 29-02-2004 20:07


All times are GMT -5. The time now is 05:20.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi