The analysis results seemed to be unrealistic. Am I doing it correctly?

[s193643]

Dear Inventor Forum,

I am little confused about the output result. I have created a model of a concrete joint as shown in Fig 1. Where 30 MPa wall is rigidly connected with the 12 MPa mortar (red in color) and this mortar is rigidly connected with the 55 MPa HCS (slab: yellow in color). I applied pressure loads in slab, 2.23 MPa in Z axis, 1.16 MPa in negative x axis, 0.00215 MPa in negative Y axis and a negative moment of 4.39E06 N-mm about Z axis.

Fig:1

Material properties are given as shown in Fig 2 as follows:

     

Fig: 2

I provided fixed support at the bottom of wall and in YZ plane of wall (where HCS is not connected). Now when I analyzed the model. The stress distribution in the model is as shown below (Fig 3):

Fig: 3

Now my doubts are:

1. I can’t define all materials in the concrete category. Even though I input the different value for different material, it changes the properties of last material to all. How to fix this? That’s why I used uncategorized materials for my above 4 materials shown in fig 2.
2. In the result shown in fig 3, in mortar, why the stress is concentrated at one corner?
3. Most of the mortar seemed to be less effected like 1.349 MPa.  Is this ouput ok? Or my model contains some error?  
4. When I increased the strength of mortar from 12 MPa to 16 MPa, the max Von mises stress is increased from 6.696 (fig 3) to stress 7.955 (fig 4). I think the stress should be decreased since we are using higher stiff concrete. Why it is increased ?

Fig 4:

Any kind of suggestion is appreciated

-PURU

[tobias]

Hi @s193643 ,

Maybe this thread will give some clarification of using concrete in Inventor Analysis:

https://forums.autodesk.com/t5/inventor-forum/concrete-compression-test-model-with-strange-outputs/m...