Contact US

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!

*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

Non-linear material in Nastran

Non-linear material in Nastran

Non-linear material in Nastran

Hi guys!
First of all, I'm new to this forum and this is my first thread, so if there are some mistakes in the way that I posted it tell me. Anyway, I'm working on finite element simulation with Patran and Nastran on a particular composite material, actually, we can say it's a sandwich. I'm trying to simulate the different behavior of these sandwich faces because they act differently in compression and tension. So I thought to write a field in which I set the strain and stress, but I can only use this field for isotropic/nonlinear elastic material but the material used for the faces is a composite made of unidirectional fibers layers at different angles. If I wasn't clear tell me and I'll give you more details in a way to resolve this problem together.
Thanks for your cooperation!

RE: Non-linear material in Nastran

You use PCOMP/MAT8 cards for composite layer definition.

I dont recall, but there may be a way to define a nonlinear MAT8 card with different tension and compression moduli. Read the manual.

RE: Non-linear material in Nastran

Hi, SWComposites! Thanks for your answer. Honestly, I took a look at the manual but I didn't find anything useful, but probably I wasn't good in searching (I read Nastran 2018 Quick Reference Guide). Would you like to give me more details if you know more about this kind of problem?

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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