Imperfect Interface Material

Constitutive Law

Interface materials are used only [[NairnFEA] and are only linear elastic. The imperfect interfaces documentation gives the details. The constitutive law relates normal and tangential tractions on the interface to displacement discontinuities:

      [math]\displaystyle{ T_n = D_n[u_n] \qquad {\rm and } \qquad T_t = D_t[u_t] }[/math]

where D_n and D_t are interfacial stiffness parametes and [u_n] and [u_t]. Here n and t refer to normal an tangential directions relative the the interface.

Property	Description	Units	Default
Dn	Normal direction stiffness	MPa/mm	none
Dt	Tangential direction stiffness	MPa/mm	none

History Variables

None