ERODE in CSCM MAT 159

[Nava Farhadzadeh]

Hi All

Does anybody know what value is best for ERODE in mat 159? Do you choose the value based on trial and error, a value between 1 and 1.10?

This is from mat 159 manual:

Element Erosion. An element loses all strength and stiffness as d→1. To prevent computational difficulties, such as mesh tangling and shooting nodes, element erosion is available as a user option. An element erodes when d > 0.99 and the maximum principal strain is greater than a user-supplied input value.   

Could you give me some advice on what it means when d→1. I've read d is a damage parameter in compression but I don't quite understand what it does. I don't understand the part that it has been explained that max principal strain is greater than a user- supplied input value.

Any advice is very much appreciated.

Kind regards

[James M. Kennedy]

Dear Nava,

 

See if this presentation is of some help:

 

The LS-DYNA concrete material model (*MAT 159) with eroding contact option (data included), allowed rapid simulation of impact penetration and by-passed the need for excessive computer run times often required for Arbitrary Lagrangian Eulerian (ALE) LS-DYNA models and equation of state (EOS) material models:

 

Glance, P., "Simulation of Impact Proof Testing of Electronic Sub-Systems", 12th International LS-DYNA Users Conference, Dearborn, Michigan, June, 2012.

 

https://www.dynalook.com/conferences/12th-international-ls-dyna-conference/blast-impact20-e.pdf

 

Sincerely,

James M. Kennedy

KBS2 Inc.

January 13, 2021

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