Imperfect Interface Material

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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

Examples