Learning Forum

[LS_DYNA User]

I have developed a subroutine for an orthotropic material and implemented in LSDYNA. I want to delete elements once all integration points (in-plane and through thickness) have failed (not only one). Just wondering how that can be done? Thanks

[Alex R.]

Hello, 

Failure can be incorporated in the material routine with IFAIL.

• IFAIL =1: the element is eroded as soon as first integration point fails.
• IFAIL<0: abs(IFAIL) states the number of integration points that needs to fail before element erosion. 

Please let me know if that helps. 

Thank you,

Alex 

[LS_DYNA User]

Thanks, I tried that earlier but did'nt get the results that I was looking for. I have multiple damage modes. I may need to change my deletion criteria. 

[igandiko]

Please take a look at *define_element_erosion. Not sure if it works with user material routines but maybe worth a try. 

[Ushnish Basu]

Actually, IFAIL<0 in MAT_USER_DEFINED specifies the position of the parameter NUMINT in the constants array, where NUMINT specifies the number of integration points that need to fail.