Learning Forum

[SEC_student]

Good morning everyone !

Im new here, and i have questions about some settings in workbench explicit dynamics.

I don't really understand the function of these following settings :

-Shell bwc warp correction

-Shell thickness update

-Density update

-Hourglass damping

I'm conscious that there is a lot to explain but i need it for my student job : )

best regards

SEC_student

Hello from FRANCE ;)

[Akshay Maniyar]

I have explained all the settings options you have asked. Also, you can check Ansys Autodyn user manual.
Shell bwc warp correction:
The Belytschko-Lin-Tsay element formulation becomes inaccurate if the elements are warped. To overcome this shortcoming, the element formulation has a correction for the element warp included. We recommend that this correction is turned on.
Shell thickness update:
By default, the thickness of a shell quad element is stored and updated at the nodes of the element. An alternative, slightly more efficient, option to store and update the thickness at the element is also provided.
Density update:
The element density can be updated each cycle using one of two methods; incrementally from the change in volume relative to the last cycle or recalculated based on the current mass and volume of the element.
Program Controlled (default, recommended)
Incremental (for large deformations)
Total (for small deformations)
Hourglass damping:
In order to avoid hourglass instabilities, a set of corrective forces are added to the solution. Two formulations are available:
AUTODYN standard:
It is default and most efficient in terms of memory and speed.
Generates hourglass forces proportional to nodal velocity differences.
Hourglass forces may not sum to zero.
Flanagan-Belytschko:
Recommended for simulations in which large rotations of hexahedral elements are expected.
hourglass forces sum to zero.

Regards Amaniyar

[SEC_student]

!
Thank you for your quick response!
I can carry out my research now!
Have a nice day! best regards
SEC_student