Learning Forum

[najsa]

Hi there! I'm currently working on a cyclic loading analysis for a pipe member, but I'm having trouble getting the solution to converge during the tensile stages. I've noticed that stress is concentrating at the edges of the pipe, as you can see in the screenshots I've attached. Although my main focus is on buckling, I'm struggling to figure out why the analysis keeps crashing when I try to simulate tension. I've included a graph of the loading, which is supposed to repeat the same displacement values three times in addition to other cycles(Ive included another graph example), but the solution crashes during tension. Can anyone offer any suggestions for what might be causing this issue and how I can resolve it? Thanks in advance for your help!

[Ashish Khemka]

Hi,

The elements look distorted. Can you please check the output?

Regards,

Ashish Khemka

[najsa]

 

Hello :)
Yes I forgot to mention that I read the output and tried to apply the suggestions but nothing happened to come in handy. (Try       
 incrementing the load more slowly (increase the number of substeps or   
 decrease the time step size).  You may need to improve your mesh to     
 obtain elements with better aspect ratios.  Also consider the behavior  
 of materials, contact pairs, and/or constraint equations.  Please rule  
 out other root causes of this failure before attempting rezoning or     
 nonlinear adaptive solutions.)

 

[Ashish Khemka]

Hi,

Please see if the following post helps: Dealing with Convergence Issues - Element Distortion Error - FEA Tips

Also, are you applying load on edge? If yes then try applying the load on an area instead of edge.

 

Regards,

Ashish Khemka