ZeroLengthImpact3D

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This command constructs a node-to-node zero-length contact element in 3D space.

element zeroLengthImpact3D $tag $slaveNode $masterNode $direction $initGap $frictionRatio $Kt $Kn $Kn2 $Delta_y $cohesion

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$tag	unique element object tag
$slaveNode	Slave node tag
$masterNode	Master node tag
$direction	1 if normal vector of master plane points to +X direction 2 if normal vector of master plane points to +Y direction 3 if normal vector of master plane points to +Z direction
$initGap	Initial gap between master plane and slave plane
$frictionRatio	Friction ratio
$Kt	Penalty in tangential directions (parallel to master and slave planes)
$Kn	Penalty in normal direction (normal to master and slave planes)
$Kn2	Penalty in normal direction after yielding based on Hertz impact model
$Delta_y	Yield deformation based on Hertz impact model
$cohesion	Cohesion, if no cohesion, it is zero

NOTES:

1. This element has been developed on top of the “zeroLengthContact3D”. All the notes available in “zeroLengthContact3D” wiki page would apply to this element as well. It includes the definition of master and slave nodes, the number of degrees of freedom in the domain, etc.
2. This element adds the capabilities of “ImpactMaterial” to “zeroLengthContact3D”, without the need for extra nodes and elements in the modeling process. It means the capability of having an "initial gap" in the normal direction and also the capability of considering energy dissipation due to impact in the normal direction.

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EXAMPLES:

Gang Wang to provide a smart example!

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REFERENCES:

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Code Developed by: Arash E. Zaghi, Majid Cashany, University of Connecticut (UConn)