×
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

Bilinear Isptropic Hardening ? Please Help.

Bilinear Isptropic Hardening ? Please Help.

Bilinear Isptropic Hardening ? Please Help.

(OP)
Dear All,

I am running a Impact (Dynamic/ Explicit) Simulation, A Modeling of Charpy Impact Test; A striker hitting a specimen. However, I am kind of having problem in setting the material Properties.

The Material Properties should be :

Steel Alloy 4140  with Young's modulus of elasticity 207 GPa, yield strength of 655 MPa, Possions ratio of 0.3 and ultimate tensile strength 1020 MPa at room conditions (25 °C). USE bilinear isotropic hardening (a piecewise linear plasticity model).

Now, I know how to insert simple properties such as Density, Elasticity and Plasticity. But i am blank about 'Bilinear Isotrpoic Hardening'..

My question is a simple one:

Can someone tell me how and where should i insert these properties in the Material Properties (Step by Step)?

Thank you,
Fhd



 

RE: Bilinear Isptropic Hardening ? Please Help.

Hello Fhd.

Let me see if I can help you out here.

If I understand correctly, you want to add a second linear branch to your material constitutive relation, which would correspond to hardening.

I think the answer is to simply add a second line to the *Plastic command, where you introduce the ultimate strength and strain (which you don't mention in your question, i'll name it eu).

Example:
*Plastic
655, 0
1020, eu

Further, maybe you should consider using true stress and strain definition, which I am not sure you considered so far.

Good luck,
Pirs

RE: Bilinear Isptropic Hardening ? Please Help.

Adding to my previous answer, eu is defined as the plastic strain, so you should subtract your yield strain from the ultimate strain.

Pirs

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