Jump to content
Sign in to follow this  
pianpianc

Why the strain is not linear in a linear analysis?

Recommended Posts

Hello,

 

I have a 3D solid brick elements on top of the 2D shell elements, and the equivalent tool was used to combine the two different element to be one piece. However, I created a strain plot, and the strains were not linear, it has a jump at the location where the two different element connect.

Is anyone have any ideas about what is wrong with my model?

 

Thank you,

PianPian

Share this post


Link to post
Share on other sites

Hi,

 

actually, there is nothing wrong with your model. The difference in strain between solid and shell elements is because by default stresses and strains are output at the element center only. In the case of bending there is higher stress and strain at outer surfaces or edges. If we want to find the stress/strain at those locations we usually apply a membrane/rod elements skin of negligible thickness to measure those quantities. 

 

For more details (its about stress but the same applies to strain):

 

 

Attached is the simple cantilever model where I requested stress & strain output at corner locations. As you can see, there is no discontinuity in strain values.

bending.hm

strain.jpg

Share this post


Link to post
Share on other sites

Hi Ivan,

 

Thank you for the help. That was very helpful. I looked for the strains at the grip point of the solid elements instead, and I got the same results as the shell elements.

 

Hyperman likes this

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...