×
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

City bus crash using LS-DYNA

City bus crash using LS-DYNA

City bus crash using LS-DYNA

(OP)

Dear all,

I am trying to model a city bus crashing againt a rigidwall. The bus has been modelled, mainly, using beam elements.

THE PROBLEM: During the first part of the simulation everything seems to be perfect. The front structure beams are deformed during the crash.

In the simulation, when the failure strain of one beam is reached, the element is deleted, as expected.

The problem appear when the failure strain is also reached in an adyacent beam. At this moment, the node situated between the both beams that have failed is deleted and the simulation stop working properly. Simulation is still running but the contact between the rigidwall and the bus does not work any longer.

Anyone have any idea about why contact stop working when a node is deleted? (i know it happened when a node is deleted because i repeated a simular simulation using shells elementos and the result is the same)

Thank you very much for your time, and sorry for writing so much, but i have tried to explain it in the best possible way.

RE: City bus crash using LS-DYNA

My initial concern would be validating the approach of using beams to model the bus - how have you validated this representation? Surely shells or solids (or a hybrid structure with shells/solids/beams) would be a better choice?


------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

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