×
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

Plate with thickness variation

Plate with thickness variation

Plate with thickness variation

(OP)
Hi Guys,
I want to model a plate with thickness variation. the nominal thickness is 2 mm but after measurement found the thickness is vary from 1.85 to 2.15 mm. My question is how I can model the plate? if I make the plate as a part with nominal thickness how I can apply the thickness variation?

RE: Plate with thickness variation

(OP)
so if we have a plate and thickness is not regular how we can define the dimension? how we can define the thickness 2 ± 0.15 mm?

RE: Plate with thickness variation

More details would be very helpful. What is the end goal of your analysis? DO you have a full CMM scan of the part? Could you model the plate at these 2 limits. I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

RE: Plate with thickness variation

(OP)
Thanks Rob,
the problem is about modelling of a cantilever which is a part of machine. the machine sensitive to the frequency of the cantilever and I have found that the thickness of the cantilever is not the same. I only can measure the cantilever thickness from the edges and can not measure it in 3D to model exact shape. I want to model the cantilever when the thickness is not curtained. Do you think it is possible to do that? can I define an standard deviation for the geometry when I model the part or during the process in abaqus?

RE: Plate with thickness variation

Hi,
I don't think it is possible to define a deviation from nominal geometry while preprocessing, but why don't you study the effect of thickness by modeling the plate with min thickness and max thickness and see the differences?

RE: Plate with thickness variation

(OP)
Thanks shingouz

I am not sure if we model the minimum and maximum geometry can get good result as the geometry randomly changing along the part so we need a logic behind this to explain about the effect of random geometry changing.

I have heard using Ansys we are able to define the geometry deviation. Can we do the same thing in Abaqus?
Is there any other idea to model a simple part with thickness of 2 ± 0.15 mm?

RE: Plate with thickness variation

Ok, did not get too much into your problem, but this ideas came into my mind, quite probable that you considered'em before:

>Do a parametric analysis (either "parametric" in abaqus or just repeat the simulation for thicknesses e=2.15,2.10,2.05 ... and do a postanalysis in your excel or so sheet.

>Use 3d elements instead of shell.

good luck
n3l3

RE: Plate with thickness variation

I would assume a linear change in thickness from 1 known point to the next then throw a factor of safety on it. You could also drive the thicknesses with Python or Isight and basically do a monte carlo simulation on thicknesses. I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

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