High Artificial Energy (ALLAE) in Abaqus Explicit analysis

[Hassan Nazari]

Hello everybody,

I am doing such a kind of FE simulation using ABAQUS Explicit for composite delamination analysis. In this case, I have used once Cohesive Zone Element (CZM) and then with Cohesive Surface for deboning analysis

The simulation is itself quite dynamic process, somehow the deformation time is only around 3[ms] and the deformation speed is around 5[m/s].

I used the same characteristics for both CZM and Cohesive Surface description. Enhanced Hourglass was also used for Element Control.

The problem is as below:

The resulting Artificial Energy (ALLAE) for Cohesive Surface assumption is so high; around 70% of ALLIE; while for CZM model is just around 1% which seems correct.

Does somebody have any idea about the reason behind that? I would be happy to let me know if you have and hints or solution for that.

Thanks in advance,

 

[Mustaine3]

Scale up the deformation and see if you have hourglassing in your structure.

Scale the hourglassing factor down in another analysis and check the results again.