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


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

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:
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?


RE: A cantilever beam subjected to the uniform pressure load

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:


RE: A cantilever beam subjected to the uniform pressure load

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!


White Paper: Industrial Control Basics: Contactors
A contactor is an electrical device used for switching an electrical circuit on or off. Considered to be a special type of relay, contactors are used in applications with higher current carrying capacity, while relays are used for lower current applications. Download Now
Research Report: State of IoT Adoption in Product Development 2019
This research report, based on a survey of 234 product development professionals, examines the current state of Internet of Things (IoT) adoption by product design teams, its perceived importance, and what features and capabilities teams consider important when making decision about adding IoT functionality to their products. Download Now

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