I am doing my master thesis on crash simulation of plywood (7 layers-orthotropic material) structures in buses using explicit LS-DYNA FE program. I would like to include failure in my model. Right now I am working on Mat_054_55 (MAT_ENHANCED_COMPOSITE_DAMAGE…..material model from LS-DYNA material library).

Mat_054_55 allows me to get failure by defining anyone of the following parameters,

1. EFS                 (Effective Failure Strain)
2. DFAILT           (Maximum strain for fiber tension)
3. DFAILC          (Maximum strain for fiber tension)
4. DFAILM         (Maximum strain for matrix straining in tension or compression)
5. DFAILS           (Maximum shear strain )

If I define EFS alone, I am able to get failure in my model. But i am not able to get failure in my model if i define DFAILT, DFAILC, DFAILM or DFAILS. Please can anyone help me regarding this?????? so that I can run my simulations more effectively.

Please anyone comment on this as soon as possible.