[ABAQUS] Energy balance v6.4-v6.7
[ABAQUS] Energy balance v6.4-v6.7
(OP)
I have an elastic crack propagation analysis using slave-master method with crack length time-dependent criterion. It works fine unless I can’t find the balance energy between internal energy and work external like the following (ABAQUS Theory Manual/Energy Balance 1.5.5)

If we note :

I cannot identify what is the problem with the energy balance ABAQUS.
I appreciate it if you can give me any help.
Thanks!

If we note :
- ALLWK : External work for the whole model
- ALLIE : Internal energy for whole model
- ALLSE : Strain energy for whole model

I cannot identify what is the problem with the energy balance ABAQUS.
I appreciate it if you can give me any help.
Thanks!





RE: [ABAQUS] Energy balance v6.4-v6.7
2. The energy balance using the total energetic quantities computed by ABAQUS (as history variables) is given by:
ETOTAL= ALLIE (total internal energy)
+ ALLKE (kinematic energy)
+ ALLVD (viscous dissipation energy)
+ ALLFD (frictional dissipation energy)
– ALLWK (external work)
=constant
where:
ALLIE=ALLSE + ALLPD + ALLCD + ALLAE,
ALLSE=recoverable strain energy
ALLPD=plastic dissipation energy
ALLCD=energy dissipated by creep, viscoelasticity and swelling
ALLAE=“artificial” strain energy.
Depending on the type of the problem being solved, some of the quantities above are zero.
RE: [ABAQUS] Energy balance v6.4-v6.7
all quantities ALLKE, ALLVD, ALLVD, ALLSE , ALLPD , ALLCD , ALLAE are zero. (Fig. 1)
Fig.1 : Energy quantities zero
I obtain:
CODE
Fig. 2: Total internal energy
Then I can rewrite the energy balance like this:
CODE
CODE
Fig. 3: Energy balance
Here is my model ABAQUS (input *.INP) for whom has the same question for a crack propagation problem.
Click here to download the model
RE: [ABAQUS] Energy balance v6.4-v6.7
Try to reduce the size of the maximum time increment.
I got almost overlapping curves for ALLWK and ALLIE using tmax=0.05.
(Also, I would turn NLGEOM=ON, but probably you know better if this is suitable.)
RE: [ABAQUS] Energy balance v6.4-v6.7