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

Simulating true weight on Explicit Analysis

Simulating true weight on Explicit Analysis

Simulating true weight on Explicit Analysis

Hello all,

I am currently analysing the crash deformation and structual strength of a tubular space frame chassis.

The chassis weight is around 130kg, I have no issue with my current set up simulation. However this result is unrealistic. the final weight of the car (engine, gearbox, driver etc) will come in at around just under 1000kg, so in reality the impact force (into a wall) will be much higher than what I currently am experiencing by just crashing 130kg of mass.

I attempted to resolve this by increasing the material density to account for the difference in weight, but I am unsure as to whether or not this is the best approach to take as it may possibly mess up the timesteps in the simulation.

Is there another method i could take to account for the impact that the chassis would expect to see upon impact based on the final weight?

Best regards


RE: Simulating true weight on Explicit Analysis

I think that it would be best to add a point mass (or multiple point masses) representing parts that are not modeled.

RE: Simulating true weight on Explicit Analysis

thanks for the response FEA way, I vaugly remember looking into this a while back for i sepoerate reason. I have a feeling that you cannot add point a mass on my version of Ansys (17.0) but I do have access to the student version.

I will look into it.

Thanks again.

RE: Simulating true weight on Explicit Analysis

Unfortunately it seems that for explicit they were added in version 19.

RE: Simulating true weight on Explicit Analysis

I thought that was the case. I'll have a go with 19.0 later on tonight.

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