×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Need Help With Off Center Axial Loading Calculations Please

Need Help With Off Center Axial Loading Calculations Please

Need Help With Off Center Axial Loading Calculations Please

(OP)
Hello,

I am using a hot press machine to press powder into a designated shape. The force comes from above the powder and is axial only. The powder is placed in a circular die and another "punch" is placed between the die and the actual pressing ram. I am trying to prove the implications of not centering the die with the punch and the punch with the ram. In other words, I think I am trying to prove that if one of these componenents is not lined up axially with the ram, the component may see some type of bending stress or something like that.

Please see this diagram for an example of the setup including an offset example:
[URL=http://img217.exs.cx/my.php?loc=img217&image=axialloading7dl.jpg

I have been searching through my mechanics of materials text book and haven't found any easy way of explaining this. I'm just looking for some simple calcualtions that show the severity of not lining all of these components up.

I appreciate any help that is offered.

Thank you,
Mike

RE: Need Help With Off Center Axial Loading Calculations Please

Hi italyct23

If you imagine that the ram see's the offset load then the
combined stress is that of the bending stress and normal
tensile stress ie:-

on one side of the ram the stress will be:- (W/A)+ My/I

and on the other:- (W/A)- My/I

where W=axial load
      A= cross sectional area of the ram
      M= bending moment due to offset of axial from the ram
         centre

      y= the distance from the neutral axis to the outer
         surface of the ram

      I= second moment of area of the ram


regards desertfox

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources