week-11 Joint creation and Demonstration

Aim:-To perform different types of joints using solver as lS-DYNA

Theory:-

The joint which is used connects two separated parts and makes the connection.

 Types of Joints:

• Here we need to create 4 types of joints with two cases.
• For the first case, we need to perform jointly with taking components as rigids
• And for a second case, we need to perform a joint with deformable.

• Material card for rigids we need to select the material as MAT_RIGID.

• The advantage of a rigid material card we can constrain the part by defining CMO=1, CON1, CON2=7 which is totally constrained.
• Material card for deformable we need to select the material as MAT_PIECEWISE_LINEAR_PLASTICITY.

• Section id will be the same for every part.

• The control time step is given to control the solution stable and we need to give termination as 5ms and the binary d3 plot.

REVOLUTE JOINT:-

RIGIDS:

• We need to create 4 nodded shells by using the shape mesher and translate a copy of it to 20mm which is present in the element edit tool.

• After that, we need to create two nodes that should be coincident and another two nodes should be linear and coincident with some distance.

• We need to make node 501,502 as a set for part1 and 504,503 as a set part2 by using a constrained extra node-set.

• Then after we need to make a revolute joint by using constrained revolute join by selecting node id in the form of the same coordinate value but it should be connected to different parts

• After this, we need to give velocity to another side by using velocity rigid and other we need to fix.

DEFORMABELS:-

• For deformable we need to create CNRB in place of constrained node-set
• We need to use elastoplastic material.

• Then after we need to create the revolute joint as same as follow as rigids

TRANSLATION JOINT:-

RIGIDS:

• We need to create two boxes by using the shape mesher option and select box shell and create.

• We need to create the coincident nodes of 6 by pair of three on the same axis.
• And make sure one set of nodes should be offset.

• Here we need to define the 2000,2002,2004 to one part by using a constrained extra node-set.
• 2001,2003,2005 to another part by using an extra node-set.

• We need to give velocity to part2 by velocity rigid and run the simulation.

Deformable:

• For deformable we need to create 6 nodes with the center point as the first node and give offset values of other nodes by changing the linear axis other remain constant.
• Then we need to create CNRB with those nodes by switching off the pnode, where the first node will be considered as master nodes.
• Select one node to create CNRB with part1 as such we need to create three CNRBS for part1 and Three for part 2.

• The same steps followed as rigids.
• Make sure we need to used velocity for deformable and node 5,6 should be offset.

SPHERICAL JOINT:-

• For this joint, we need to create 2 nodes with the same coordinates and we need to set it to part
• And then we need to assign the spherical joint 
• Here we made 2 circles with different radius considering origin as the center point.
• After this, we assigned velocity rigid to the small circle.

DEFORMABELS:-

• We need to make CNRB by taking origin as a center with respect to two parts.

• And same as rigid follows we need to fix bigger circle by boundary SPC constrained.

CYLINDRICAL JOINT:-

• It was the same as the translation joint but here only two pairs of nodes only required.

DEFORMABLES:-

RESULTS:-

REVOLUTE JOINT(RIGID & DEFORMABELS)

TRANSLATION JOINT(RIGID & DEFORMABELS)

SPHERICAL JOINT(RIGIDS &DEFORMABELS)

CYLINDRICAL JOINT (RIGIDS & DEFORMABELS)

CONCLUSION:-

• Understood how to prepare a deck for creating and stimulation joint.
• Understood how to prepare for joint for deformable and rigids.