Jump to content
Sign in to follow this  
Daniel1988

Thermal residual Strain of composites

Recommended Posts

 Hi Everybody, 

 

I am trying to simulate the residual strain on different ply's of a laminate due to different rates of cooldown. I was planning to do this with a heat transfer analysis (transient) but I believe that  composites are not supported in transient heat transfer. 

 

Is it possible to perform a sort of transient analysis applying a Delt Tº in the different time frame? I was thinking to do this with TLOAD1 with excited a TEMPD and a Table1

Is this approach correct? 

 

Thank you beforehand

 

Share this post


Link to post
Share on other sites
27 minutes ago, Prakash Pagadala said:

Hi @Daniel1988

 

WIth transient, it is not possible to apply TEMPD as load type. 

Hi Prakash, 

 

Thank you for your reply. Do you have any suggestion for assessing my simulation? I think the only way to see the influence of the temperature in time on the residual stresses is with a heat transfer analysis. Is this possible with layered elements? Or is there a way to convert this layered shell elements into solid elements? 

 

I would really appreciate if you can suggest me something

 

Best regards, 

 

Share this post


Link to post
Share on other sites

Hi @Prakash Pagadala

 

I was doing some thinking about how to solve this problem with this simulation. Is it possible to do the heat transfer analysis using a composite ply by ply solid modeling? Is going to be more time consuming but maybe this can work. What do you think? 

Using PSOLID and MAT9ORT 

 

Share this post


Link to post
Share on other sites
Guest

Hi,

 

IN GENERAL FOR MOST CARBON/POLYMER systems…As long as your cooldown is “slow enough” to not produce any “dynamic effects”…the problem is time INDEPENDENT.  You can simply perform a static thermal residual with a Delta Temp (Simulation Temp – Cure Temp).  

Share this post


Link to post
Share on other sites

Hi @Prakash Pagadala

 

Thanks for your response. in fact, the problem I am facing deals with a simulation of the effects of fast and slow cooldown in the residual strains in the material. I already create the model with solid elements for each layer. We have two specimens that are are cooled down at different rates (one is cooled down in the oven) and the other one is forced with dry ice. the two specimens are instrumented with strain gages in the different layers and we notice different strains for both process. 

In this case, Can I still go for a Heat transfer transient? 

 

Thanks for your support

 

 

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...