Damage modeling in ABAQUS

[GAT]

Hi, I wanted to clarify a doubt I have while implementing damage models in ABAQUS EXPLICIT
Could any one tell me which of these two relations are correct
SIG_n+1 = SIG_n + STIFFNESS_n+1*(INC_STRAIN_n+1)
OR
SIG_n+1 = STIFFNESS_n+1*(STRAIN_n+1)

It is apparent that the first of the above two seems correct, but with increase in damage the stress levels do not drop to zero, even if damage was set to 1 it remains at a level when damage was first initiated. I wanted to know how should one bring the load carrying capacity to zero when complete damage has occurred.
If the second one is used this is not a problem, but the formulation does not seem correct

Thanks

[Kumar Kurambakurash]

A hyperelastic approach will always compute stresses from an elastic potential.
Within damage mechanics, this elastic potential is deteriorated with multiplying it
(1-D). So the second form is OK.

I can suggest you my own manuscripts on ABAQUS implementations of damage models. after they are published

Kumar

[GAT]

Thanks, for the reply

[GAT]

Hi Kumar, could you send me the references of your publication

Thanks

[mastanabad]

Hi every one would you tell me whats going on ?
Actually i teach abaqus in our university but i am like no idea about element re movement in abaqus. how can i start to learn element re movement. if there is any file or any sample of cae file which you used before it will be a great honor if you help an undergraduate student

[mastanabad]

I mean like this picture that i attached
Please please please ......

[lumpwood]

There are a number of examples of element removal in the Abaqus manual, have a look at the 'Rigid projectile impacting eroding plate' example.

[mastanabad]

Actually just the codes are available and i really dont know how to use it. is it available in cae ?
do you have any property model ?

[lumpwood]

If you like you can just download one of the examples from the manual and import it into CAE (File>Import>Model). That way you can see what settings they used.

I've never used the built in models but it may be as simple as supplying a failure (Equivalent plastic) strain through the ductile damage material model in CAE. I'm afraid I can't recommend a particular model/parameters for your application.

[mastanabad]

Sorry for being so stupid but what do you mean by the manual ?
I am going to search for it.