×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# PLOAD4 on QUAD with Cylidrical Coordinate system problem

 Forum Search FAQs Links MVPs

## PLOAD4 on QUAD with Cylidrical Coordinate system problem

(OP)
On a QUAD 1x1, pinned at all nodes ( see the image ), I apply a constant pressure-traction (PLOAD4) at x-direction, with a magnitude of 10. The Tx reactions on each support is 2.5 as expected. Total X force = 10*1*1=10. Each support takes 10/4=2.5.
I create a Cylindrical Coordinate System (CORD2C) as it seems ( with Z axis colinear with Y global ), and applied again the same pressure (PLOAD4), with this CORD2C as reference (CID entry of PLOAD4).
The results on each support are:
Tx= 2.165
Tz = 0.72

The above result, less Tx than 2.5 and the non zero Tz, obviously means that Nastran takes as pressure surface a cylindrical one ( the radius is 0.50 ), so the load it is assumed to be something like the 3rd image.
The thing is that it's IMPOSSIBLE for me to generate the above reactions with whatever I tried.

Does anyone knows what Nastran does??

#### 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.

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

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

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!