Failure criteria?

[Bigtree]

Hi, what is the diference whether we set up fail stress, (fail strian) or not?
When I plot data from field output, I didn't see the differrence?

 

[mrgoldthorpe]

It depends on the material. A similar question arose some time ago:

http://www.eng-tips.com/viewthread.cfm?qid=151093&page=3

 

[phanhung]

Dear
i am working with DEBOND two surfaces, my file get this kind of massage: "THE SLAVE-MASTER PAIR ASSEMBLY_DB2 ASSEMBLY_DB1 SPECIFIED ON *DEBOND HAS NOT BEEN DEFINED. THIS MAY BE DUE TO NONEXISTENT SLAVE OR MASTER SURFACE, OR DUE TO ERRORS WHEN PROCESSING THE *CONTACT PAIR KEYWORD". Althought i have already defined it in CONTACT PAIR and again in INITIAL CONDITIONS. Please help me how to solve this problem.

Thanks

Phanhung

 

[phanhung]

Dear

i get this error:"TOO MANY ATTEMPTS MADE FOR THIS INCREMENT". Which parameters will be consider to deal with this case.

And when i using FRACTURE CRITERION, TYPE=CRACK LENGTH. ABAQUS have already give me a result, but between two surfaces debonding were not seperated. Please tell me the reason.

Thanks

Phanhung