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 Dn and Dt are interfacial stiffness parametes and [un] and [ut]. Here n and t refer to normal an tangential directions relative the the interface.
Material Properties
The only two properties for this FEA material are:
| Property | Description | Units | Default |
|---|---|---|---|
| Dn | Normal direction stiffness | pressure/length units | none |
| Dt | Tangential direction stiffness | pressure/length units | none |
History Variables
None