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

Help Understanding and defining required plasticity parameters of aisi 3140 Steel

Help Understanding and defining required plasticity parameters of aisi 3140 Steel

Help Understanding and defining required plasticity parameters of aisi 3140 Steel



I am analysing a tubular-frame chassis collision using the explicit dynamics solver on Ansys.

I have sufficient data regardign the 3140 steel properties as you would expect. However I want to explore the deformation and I want to allow the structure to deform to try and give a best possible simulation result.

Aside from the density, Youngs modulus, Tensile and Yield strength what should I bring in to explore the plasticity characteristics. From what I have seen, I need to define the material surface finish, and either the Johnsons cook strength, multi-linear or bi-linear isotropic characterstics. Is this true.

I understand for things such as johnsons cook strength requires testing. Could someone please advise me on this and what would be the best approcah to take.

Thank you


RE: Help Understanding and defining required plasticity parameters of aisi 3140 Steel

You need to measure and / or calculate parameters that represent the plastic behavior of the metal.

There is a range of the most commonly used models for plastic strains of metals. These include a bilinear plasticity model, tabulated definition of plastic strains and many others. It is true, however, that most of these models do not take into account the kinematic strengthening phenomena. In other words, no effects of strain intensity on the yield strength are taken into account. Besides, high strain rates may cause adiabatic heating of metal in the greatest strained region and, therefore, its local softening.

The Johnson–Cook model is the most attractive among well-known plastic strain models. This model takes into account both kinematic strengthening and adiabatic heating of the material undergoing strains. However, difficulties exist with determining the parameters of this model. (LINK)

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