Hi all Hope you are well. I 1

[Hussain2339]

Hi all

Hope you are well.

I have simulated impact on the Aluminium plate. It's following the trend before bulging not after Bulging. Where am I making mistake?

 

[FEA way]

More details will be needed to help you with this problem:
- can you share some screenshots showing the stress/displacement contour plots on the deformed model ?
- how do you measure the force ?
- what are the general settings of the simulation (material model, boundary conditions and so on) ?

 

[Hussain2339]

I used Isotrpic Piecewise linear plasticity model. Plate fixed from all sides and Projetile allowed to move in the direction of the plate only. Inertia and velocity are assigned to the reference points. Surface to surface contact used. I obtained force as total contact pressure in the history output at interaction.

 

[FEA way]

So force suddenly drops at around 5 ms both in the experiment and in reference simulation while your simulation shows longer growth and smooth drop like in the case with lower velocity and no bulging, right ?

Take a closer look at the deformed shape of the model (use animation too) and observe what happens at each of the significant time points. If you have some recordings from the experiment or from reference simulation, compare them with your model. Also, take a look at the assumptions of your analysis. Maybe you haven’t included something that should be accounted for (e.g. material damage).

 

[Hussain2339]

Yes, But I don't know how can I define material damage? I just entered Th plastic strain and stress. No damage parameter. I assumed that the last value of plastic strain will be the point of damage or do I need to define it separately?

 

[FEA way]

To account for material damage you have to define damage initiation and evolution criteria and allow for element deletion (this is enabled by default). Check the documentation chapter "About damage and failure for ductile metals" and additional chapters referenced there.

 

[Hussain2339]

Thank you for your guidance .