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.

Material Properties

The only to properties for this FEA material) are:

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

History Variables

None