×
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

Correlation between experimentaion and patran

Correlation between experimentaion and patran

Correlation between experimentaion and patran

(OP)
Hi Everybody,

I am trying to model a sandwich coupon that is under four point bending in Patran. I have done this experiment in a Lab and used strain gages to determine the strains.

My problem is my strains in experiment are not correlating with my strains from patran, however if I ask patran for the strain in the ply directly under the ply where my strain gage is located i get the same result. To clarify, my strain gage is located on the 8th ply, but in patran the strain that corelates to my strain gage is the 7th ply.


I am using 2-d elements to model my facesheets and 3-d for my core.

Does anyone have any idea what I am doing wrong? I would realy appreciate it. Thanks.

RE: Correlation between experimentaion and patran

More info may help.

You have a constant bending moment so whats the handcalc strain?? and how does it compare to the real & FEM?

Have you modelled the sandwich correctly and ensured that your comparing apples with apples, i.e. that the strain your looking at the FEM really is the same distance from the sandwich neutral axis as your gauge.
Not sure by how much your out, but remember that everything is an approximation.
Give more detail and you may get better answers.
 

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