Enquiries on Simulation CFD

[christylim_siyin]

Hi.
 
I am using the Autodesk Simulation Composite Design 2014 software.

Under the progressive failure result, I have selected the following
 
Failure Criterion - Hashin. 
Load Type - Strain
Axial Load X(mm/mm) - 0.1
Coordinate System - Global
E11 - 0.1 
 
However, I have problems trying to understand the following:
 
The graph show that it accelerates uniformly upwards and it rupture. However, it continues to accelerate to an even higher stress value after it has ruptured(Refer to Picture1 as attached).
 
Secondly, why is there a sudden drop in the graph as shown in Picture2 as attached?
 
I would like to know why is this so?
 
Your help would be greatly appreciated.
 
Regards
Christy

[dean.rose · Accepted solution]

Hi Christy,

The area in Picture 1 that shows the significant load drop should correlate with the tabulated information. If you click the Remove Non Fails button you should see a list of all the failed plies and the increment they failed at. Compare that list to the layup and if all the plies have failed then realistically your material has suffered a catastrophic and completely failure. This will render it unable to carry any more load although the plot would indicate so.

The second image show a slight deviation in stiffness. This stiffness would most likely correlate with a few of the plies in your layup failing before the maximum loading is achieved. Again you can confirm this failure and the plies affected by looking at the tabulated results.

If my post answers your question, please click the "Accept as Solution" button. This helps everyone find answers more quickly!

[christylim_siyin]

Hi

Would like to understand more from the drop as attach.

Will the drop likely to be fiber failure or matrix failure?

Regards

Christy