Learning Forum

[Chee Min Leong]

Hi,

I am trying to vary the young's modulus of a hollow cylinder. In my case, the Young's modulus decreases radially.

I followed the instructions here https://www.padtinc.com/2022/02/03/hold-my-beer-spatially-varying-materials-in-ansys-mechanical-made-easy/
for a cube and applied it to a hollow cylinder.

Since the model I am working with is symmetrical, I have set up quarter symmetry and my final result is shown below.

Figure 1 - Source Points & Score

Figure 2 - Material Plot 

Figure 3 - Young's modulus vs Score

 

Figure 2 shows the young's modulus changing radially but the minimum value is not 1E+9 as shown in figure 3.

 

So, my questions are,

1. Why is the minimum value not what I wrote and how can I fix it?
2. How many source points do I need to map the material properties accurately?

 

Please let me know if you need more information.

 

[Ashish Khemka]

Hi,

 

Is the 'r' value 100 where you expect 'E'=1E9 Pa? Also, if you have the nodes numbers, their location then try using the E values with node number and location for mapping the material property.

 

Regards,

Ashish Khemka

[Laure]

Hi Ansys community,
Thank you for this post. I am trying to assign variable density to a body in my transient thermal model. I have also followed the procedure suggested on PADT website and got the desired material plot (attached image). However, when I run the model there is not any temperature variation, which is incorrect. Now, If I use a constant (average) density for the same body there is temperature variation (also attached). Could you please give me any hint of what is happening?? Thanks in advance.

 

[Ashish Khemka]

Hi Laure,

I am looking into this post. By the way whenever posting a new query - please use a new post/ new discussion.

Regards,

Ashish Khemka

[Laure]

Hi Ashish,

Thank for letting me know. I look forward to trying any solution you come up with. 

Sorry, I replied to the orginal post to avoid asking a similar question in two different posts.

Regards,

Laure

[Ashish Khemka]

Hi Laure,

Is the thermal conductivity too high? Is density different for the top plate?

Regards,

Ashish Khemka

[Laure]

Hi Ashish,

Thermal conductivity is relatively low (1.17 - 2.65 W/m-C). It corresponded to saturated sediment conductivity. The top plate has a constant density equal to 1000 kg/m3.

Best regards,

Laureano

[Laure]

Hi Ashish,

I realised that when I assign the spatially variable property to bottom body (cuboid), the temperature (in the whole body) changes according to the time series temperature I assigned to top plate body. It looks like, internally, they become one body once I create the material plot for the bottom body. I thought I should mention this to you. 

 Regards,

Laure 

[Ashish Khemka]

Yes, that happens at my end as well. I am looking into a different approach.

Regards,

Ashish Khemka