Learning Forum

[Dushyant]

Hello All,

I am new to LS-Dyna and i am trying to simulate a blade impacting wood. 

The geometry is 2D and i am using ERODING_NODES_TO_SURFACE Conatact type in which the master is the node list of the blade and slave is the wood which i Have selected using its part ID. 

For Material I am using MAT_POWER_LAW_PLASTICITY for both blade and wood with additional MAT_ADD_EROSION on wood

I am getting the following error as soon as i run the simulation

Error 20211 (STR+211)
reading contact segment data
undefined node # 0
13127 0 0 111111 0
input phase will continue if possible

The node mentioned is at the extreme end of the rectangle which I have created for wood.

Please provide any input as to how I can sove the problem.

Thank You

[Reno Genest]

Hello Dushyant,

Try having part IDs for both  slave and master (SURFA=slave and SURFB=master now; we changed the nomenclature). Or use a node set for SURFA and a segment set for SURFB.

Let me know how it goes.

 

Reno.

[Imtiaz Gandikota]

Please check contact definition and node set. SURFA should be node set and SURFB (master) can be segment or part id. Nodes of SURFA are checked to see if they penetrate segments of SURFB. 

[Dushyant]

Hi, Thanks for the reply

I tried the interchanging the master and slave and making node and segement sets , but then the blade simply passes through the wood without doing anything.

[Imtiaz Gandikota]

You may have to scale contact stiffness parameters. Please see description on contact stiffness in below links.

https://www.dynasupport.com/tutorial/ls-dyna-users-guide/contact-modeling-in-ls-dyna

https://www.dynasupport.com/tutorial/contact-modeling-in-ls-dyna/contact-stiffness-calculation