Difference between revisions of "Imperfect Interface Material"
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== Constitutive Law == | == Constitutive Law == | ||
Interface materials are used only [[NairnFEA] and are only linear elastic. The [[Imperfect Interfaces|imperfect interfaces]] documentation gives the details. The constitutive law relates normal and tangential tractions on the interface to displacement discontinuities: | Interface materials are used only [[NairnFEA]] and are only linear elastic. The [[Imperfect Interfaces|imperfect interfaces]] documentation gives the details. The constitutive law relates normal and tangential tractions on the interface to displacement discontinuities: | ||
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where D<sub>n</sub> and D<sub>t</sub> are interfacial stiffness parametes and [u<sub>n</sub>] and [u<sub>t</sub>]. Here n and t refer to normal an tangential directions relative the the interface. | where D<sub>n</sub> and D<sub>t</sub> are interfacial stiffness parametes and [u<sub>n</sub>] and [u<sub>t</sub>]. Here n and t refer to normal an tangential directions relative the the interface. | ||
== Material Properties == | |||
The only two properties for this [[FEA Material Models|FEA material]] are: | |||
{| class="wikitable" | {| class="wikitable" | ||
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! Property !! Description !! Units !! Default | ! Property !! Description !! Units !! Default | ||
|- | |- | ||
| Dn || Normal direction stiffness || | | Dn || Normal direction stiffness || [[ConsistentUnits Command#Legacy and Consistent Units|pressure/length units]] || none | ||
|- | |- | ||
| Dt || Tangential direction stiffness || | | Dt || Tangential direction stiffness || [[ConsistentUnits Command#Legacy and Consistent Units|pressure/length units]] || none | ||
|} | |} | ||
Latest revision as of 13:27, 2 June 2015
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