material definitions in embedded element constraints

Hello, 

In the Abaqus documentations, it does not explain much about the embedded element techniques. I am specifically want to know how it handle the material definitions. 

In the user's guide, it only states the limitations. 

  • The material defined for the host element is not replaced by the material defined for the embedded element at the same location of the integration point.

  • Additional mass and stiffness due to the embedded elements are added to the model.

How the material definition is treated at the embedded element region? How the stiffness due to the embedded elements is added?
Thank you.