×
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

ADAMS AutoFlex Torsion Problem

ADAMS AutoFlex Torsion Problem

ADAMS AutoFlex Torsion Problem

(OP)
I want to verify (or validate) ADAMS' AutoFlex using a simple beam under torsion. Suppose a circular cross sectioned beam with a definite length (My example was Hollow Section with Outside Dia: 60mm; Inside Dia:40mm; Length:1.5m). One side of the beam is fixed. The other side is under a torque loading of 1900Nm. Also at the free side a inserted a cylindrical joint to get rid of unwanted displacements, except the twist displacement.

Using ADAMS autoflex with Replace Part option. I simulated the model and measured the twist angle. But the measured values are way higher than the values I calculated using standard strength formulas.

Anybody knows whats wrong with this simulation? By the way I fixed the beam at its section center. But when I use multi fix joints (1 center, 4 quadrants) and replace with flex; I get slightly better results but not very near to actual calculated value.

Any help is greatly appreciated.

Regards

RE: ADAMS AutoFlex Torsion Problem

What value did you get by hand? That's a pretty stiff torsion member, try again with a 1mm wall thickness.

 

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

RE: ADAMS AutoFlex Torsion Problem

(OP)
Thanks for your answer Gregg,

The problem has got nothing with the dimensions of the torsion member. The value I computed with hand calculation is simply correct. It was 2 degrees

I found out that the problem as the constraint type of the body in autoflex. I changed the left side attachment to surface. Then rerun the simulation. I got a twist angle of 2.02 degress which is pretty close to the computed value.

Regards

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

eBook - 10 Reasons to Choose CATIA on the Cloud
To compete in today’s fast-paced and competitive market, smaller and newer firms need a powerful platform that will enable them to compete with bigger players, without the heavy investments needed in computer hardware, software and personnel. 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