You are here
Progressive Element deletion during laser meltingusing ABAQUS
Sat, 2010-01-02 02:46 - ssakhtar
Dear friends
I am using ABAQUS for thermal analysis using laser moving heat source. I have successfully implemented DFLUX for thermal and subsequent stress analyses. My question is: How can I progressively delete (during moving heat source) those elements in transient thermal analysis whose temperature is above melting temperature? My intention is to analyse their effect on stress fields in subsequent coupled stress analysis.
Regards
Dr. S. Sohail Akhtar
»
- ssakhtar's blog
- Log in or register to post comments
- 19070 reads
Comments
Normally element deletion
Normally element deletion in ABAQUS is implemented in the user material subroutine (UMAT or VUMAT for explicit models). In the input deck you define which state (solution dependent) variable controls element status. I typically use the first state variable (stateNew(1)). This variable equals 1 for all active elements. After calculating the stress state, you compare to your failure criteria and if the material has failed set stateNew(1)=0. This deactivates the element.
I see you are already using a subroutine (DFLUX) - I know the ABAQUS subroutine manual has an example on how to implement user subroutines for more than one user material in a model, but I am not sure what the code looks like for subroutines of different types (i.e. DFLUX, DLOAD, UMAT etc).
Can you expand a bit on how
Can you expand a bit on how you define which state variable controls the element status?
UMAT
hi... the variable (stateNew(1)) is in the VUMATsubroutine right? may i know how about in UMAT for active and deactivate the elements? thank you...
Example input file
Dr. Akhtar,
I am working on a similar problem with heat source to remove material followed by mechanical interaction on a ceramic material. I am just starting with ABAQUS and would really appreciate if you could forward references or example files to simulate this problem. Thanks in advance!
Skolach
Almost the same problem
Dear Dr. Akhtar,I have almost same problem and I would appreciate if you let me to use your experience.I am using a damage based constitutive model through a creep subroutine and I should delete the elements when a damage parameter (one state variable) reaches to a critical value.Could you help me in this case by some hints?In advance, thank you very much for your help.
Material Deposition and Element Activation Deactivation
I'm student working on welded Pipes. I used DFLUX routine in Abaqus/Standard. I need help regarding material deposition so that element ahead to the heat source should be progressively deactived as the torch moves and behind to the heat source should be continously activated. I'm new user of abaqus. Kindly help me.
I'll be really thankful for your cooperation.