ZeroLengthContactNTS2D: Difference between revisions
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| '''$sNdNum''' || Number of Slave Nodes | | '''$sNdNum''' || Number of Slave Nodes | ||
|- | |- | ||
| '''$ | | '''$mNdNum''' || Number of Master nodes | ||
|- | |- | ||
| '''$ | | '''$Nodes ...''' || Slave and master node tags respectively | ||
|- | |||
| '''$Kn''' || Penalty in normal direction | |||
|- | |- | ||
| '''$ | | '''$Kt''' || Penalty in tangential direction | ||
|- | |- | ||
| '''$ | | '''$phi''' || Friction angle in degrees | ||
|} | |} | ||
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# The contact element is node-to-segment (NTS) contact. The relation follows Mohr-Coulomb frictional law: <math>T = N tan(\phi)</math>, where T is the tangential force, N is normal force across the interface and ,math>\phi</math> is friction angle. | # The contact element is node-to-segment (NTS) contact. The relation follows Mohr-Coulomb frictional law: <math>T = N tan(\phi)</math>, where T is the tangential force, N is normal force across the interface and ,math>\phi</math> is friction angle. | ||
# For 2D | # For 2D contact, slave nodes and master nodes must be 2 DOF and notice that the slave and master nodes must be entered in counterclockwise order. | ||
# The resulting tangent from the contact element is non-symmetric. Switch to the non-symmetric matrix solver if convergence problem is experienced. | |||
# As opposed to node-to-node contact, predefined normal vector for node-to-segment (NTS) element is not required because contact normal will be calculated automatically at each step. | |||
# contact element is implemented to handle large deformations. | |||
EXAMPLE: | EXAMPLE: | ||
Revision as of 22:09, 21 January 2010
This command is used to construct a zeroLengthContactNTS2D element object. This is a Node-To-Segment (NTS) frictional contact element used in two dimensional analysis for contact between elements with 2 DOF nodes.
| element zeroLengtContactNTS2Dh $eleTag -sNdNum $sNdNum -mNdNum $mNdNum -Nodes $Nodes $Kn $kt $phi |
| $eleTag | unique element object tag |
| $sNdNum | Number of Slave Nodes |
| $mNdNum | Number of Master nodes |
| $Nodes ... | Slave and master node tags respectively |
| $Kn | Penalty in normal direction |
| $Kt | Penalty in tangential direction |
| $phi | Friction angle in degrees |
NOTES:
- The contact element is node-to-segment (NTS) contact. The relation follows Mohr-Coulomb frictional law: <math>T = N tan(\phi)</math>, where T is the tangential force, N is normal force across the interface and ,math>\phi</math> is friction angle.
- For 2D contact, slave nodes and master nodes must be 2 DOF and notice that the slave and master nodes must be entered in counterclockwise order.
- The resulting tangent from the contact element is non-symmetric. Switch to the non-symmetric matrix solver if convergence problem is experienced.
- As opposed to node-to-node contact, predefined normal vector for node-to-segment (NTS) element is not required because contact normal will be calculated automatically at each step.
- contact element is implemented to handle large deformations.
EXAMPLE:
element zeroLengthContactNTS2D 1 -sNdNum 6 -mNdNum 6 - Nodes 5 10 12 3 9 11 1 4 2 8 7 1e8 1e8 16
Example 1:
Example 2:
REFERENCES:
Code Developed by: R.G. Mikola, UC Berkeley and N. Sitar, UC Berkeley