In my composite analysis, I wanna get reaction force in three points bending test with LS-dyna.

Please following the process:

1. I make a rectangle model on the compression nose for getting reaction force.

2. All the material is rigid body except the coupon is shell composite(mat54).

3. Implicit analysis

4. Using Automatic surface to surface tiebreak for delamination analysis when these 2 shells contact.

In conclusion, the analysis in 1 shell, which result and force-displacement curve is better than the other one.

I think there are some mistakes of interface about settings to cause the problem of force transfer.

Could you give me some suggestions to improve my tests?

Thx a lot !