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Difference between Constrained_interpolation and Constrained_Nodal_Rigid_Body for LS-Dyna?

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(@anuragdogra)
Student
Joined: 4 years ago

Hi! 

I am working on a model that has used constrained_interpolation and constrained_nodal_rigid_body for modelling fasteners. It consists of soft materials like foam and polymers and hard materials as like steel. I went through the manual but did not clearly get an idea about these. It will be great if someone can explain the difference between the two and how can they be accurately used to model fasteners for different materials.

Thanks and regards

Anurag

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Negative Volume
Posts: 641
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(@negativevolume)
CEO
Joined: 6 years ago

Hi @anuragdogra,

Great question! *Constrained_Interpolation allows you to constrain a dependent node to a series of independent nodes, while *Constrained_nodal_rigid_body (CNRB) takes a set of nodes and makes them into a rigid body. 

Both can be used to accomplish similar tasks, but Interpolation allows the part with the independent nodes to stay deformable. So if you don’t care if the fastener is defined as rigid, then use CNRBs. If you want it deformable, use interpolation.

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(@anuragdogra)
Joined: 4 years ago

Student
Posts: 18

@negativevolume got it, Thanks!:)

 

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