×
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

A cantilever beam subjected to the uniform pressure load

A cantilever beam subjected to the uniform pressure load

A cantilever beam subjected to the uniform pressure load

(OP)
Hello everyone,
I am trying to calculate the max deflection u2 of a cantilever beam. The cross-section is circle whose radius (r) is 0.01m and length (l)is 1m.One end is fixed and one end is free. This beam is subjected to a pressure on its upper circumferential surface with 10000Pa. In order to verify this model, I calculate the deformation in this way:
p*2r*(l^4)/8/E/I
E is 210*10^9Pa, I=pi*(2r)^4/64
The hand calculation of deformation at the free end is 1.516mm. However, the numerical result is 1.627(for C3D8I) and 1.704 (for C3D8R).
What's the reason for this discrepancy?

Yuchi

RE: A cantilever beam subjected to the uniform pressure load

(OP)
Hi, IceBreakerSours.
Total element is 5200. The globe size is set as 0.005.

RE: A cantilever beam subjected to the uniform pressure load

Correct me if I am wrong: Are you saying you have 20 elements through thickness? If yes, then (keeping your question aside) that seems overly excessive.

More importantly, on the analytical side, you have a long and thin beam under stress. I have not done any hand calculations but I wonder if the theoretical assumptions are even valid.

*********************************************************
Are you new to this forum? If so, please read these FAQs:

http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083

RE: A cantilever beam subjected to the uniform pressure load

(OP)
Hi. Sorry for reply late. I think it's correct about the analytical side although Large deformation is considered. I think the main reason maybe associated with the element type(C3D8I). I will continue to work on this then post my new findings.

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close