×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Material Database Question

Material Database Question

Material Database Question

(OP)
I got a Caesar input file and it's ancillary files from someone which included UMAT1.UMD. I put these in a new folder with nothing else. When I opened it I got a warning. I've read through the manual but it wasn't very helpful. Here are my questions:

1) When it says Click "yes" to keep the existing material properties, what is existing? The properties in the UMAT1.UMD file that's in the same folder as the input file or some default properties? (Both exist.)

2) Where are these other properties that are not in UMAT1.UMD? I read that there is a file called CMAT.BIN which it is also reading but it's not clear to me exactly what is going on. Why do I need UMAT1.UMD if it's got properties stored somewhere else. My guess is UMAT1.UMD overwrites CMAT.BIN but this is not abundantly clear.

3) Can anyone explain what is going on with these material files better than the User's Guide does?

(I tried attaching the image but it wouldn't let me for some reason.)

Thanks

RE: Material Database Question

The UMATx.umd file(s) should be placed in the \system directory for the version of CAESAR II you are running. You can find \system under \ProgramData.

1) "Yes means Keep Properties" which means keep the properties that are stored in the input (._A) file. "No means update the material properties" using the current material databases (CMAT which is distributed with CAESAR II and the active UMATx which can be created by users).

2) As noted above, CMAT is distributed with the software, users cannot change this. For this reason, you can use the Material Database Editor and add materials, or update materials found in CMAT (in case the Codes issue an errata). CAESAR II reads CMAT first, then UMATx. If the same material/code entry exists in both files, UMATx data overrides CMAT.

You do not need UMAT, it is optional. However, if you add materials or alter materials that exist in CMAT, this new (or altered) data is stored in UMAT. In this instance, it is wise to archive UMAT with the job file(s).

Richard Ay
Hexagon PPM (CAS)

RE: Material Database Question

(OP)
Richard, thanks for the response. So there's actually three places the material properties are stored. The CMAT file, the UMATx file and the Caesar input file (*._a) itself? I assume the input file contains only the properties that are being used in that model, correct?

So if someone sends me a file to check and I get the material warning about so and so have changed in the material database, then I should hit "Yes - Keep" because I want to use the same material the originator did, right? (Assuming his change was valid.)

For what it's worth, it seems like a better message would be "Material property for xxx in input file doesn't match material property in file: CMAT (or UMATx)."

Oh, and how do you view the contents of UMAT1.UMD? I'm looking at in a text editor and it is binary.

RE: Material Database Question

Correct, you would respond [Yes] to keep the original material properties.

To view the material properties in the database, use the Material_Database_Editor. This will show you the materials from CMAT and UMATx.

Richard Ay
Hexagon PPM (CAS)

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


Resources

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