Jump to content
Sign in to follow this  
Karthic

Nonlinear Transient

Recommended Posts

Hi,

I am doing non-linear transient analysis with LGDISP,

In this case i need to study the dynamic effect (increase in stress) due to increasing the operating speed.

 

Given enforced displacement using TABLED1 & TLOAD1. In TABLED1 the use defined displacement is 0 to 40mm in 0 to 7.5 sec.

If i need to increase the operating speed. (i.e) 0 to 40mm displacement in 0 to 3 sec

 

Will my dynamic results vary ? or its independent of time?

Capture.PNG

Share this post


Link to post
Share on other sites

Hi,

I found that varying the event time from 7.5sec to 3 sec does not vary the result. Found stress results are independent of event time...

 

Can you please share me a tutorial for impl dynamic.

 

 

Share this post


Link to post
Share on other sites

Hi Prakash,

Thank you for reply,

I have attached the TABLED1 content.

My question is if i need to attain the displacement of 40mm in 3 sec instead of 7.5 sec. (i.e) i need to study the dynamic effect (increase in stress when moment and inertia comes into play) due to increasing the operating speed.

Is this possible in nonlinear transient analysis

Capture.PNG

Share this post


Link to post
Share on other sites
Guest

Hi Karthik,

 

Transient analysis will consider dynamic effects like inertia or damping. Let me check with a sample model with the same time depedent table and I will update you my findings.

Share this post


Link to post
Share on other sites

Hi Prakash,

Thank you for your quick response

I tried a simple case and its considering the dynamic effects as per your previous post.

 

I still wonder how come a nonlinear transient takes dynamics into consideration but the simple direct transient does not ?

If non-linearity(Contact/ Geometric/ material )  is the difference between those two cases, how do they vary dynamically (inertia / momentum)

 

Please help me know the reason for it. Thank you once again

Share this post


Link to post
Share on other sites

Hi Prakash,

Sure. Attached here

 

 

 

 

Edited by Prakash Pagadala
Please do not share Project related model files on forum, Instead use Dropbox link to share the files

Share this post


Link to post
Share on other sites

Hi Prakash,

 

On Monday, December 19, 2016 at 9:49 AM, Prakash Pagadala said:

Hi Kamalakar Rao,

 

Strain is a ratio of Change in length/original length. The same times 100 gives the percentage.

 

The result depends on your input. If your input is in %, the result output will be %

 

I need to plot the strain for my components that is yielding.

 

What should be the inputs for material property card (In Optistruct)  to get proper strain results? should i give the material yield value? or what else to be input

 

 

Capture.PNG

Share this post


Link to post
Share on other sites

Hi, i used this example in order to set my non NL transient analysis.
I have added an Initial condition through parameter IC, and TIC but this condition have not been read by my model.

 

TIC have been setted with an initial displacement.

 

With Dload i applied Grav for all time of analysis.

Cattura.JPG

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
You are posting as a guest. If you have an account, please sign in.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...