I'm having problem with ABAQUS simulation of shell model
I'm having problem with ABAQUS simulation of shell model
(OP)
Hi everyone...
I'm rookie to this forum. I'm having problem with my simulation of shell element for ABAQUS. I'm currently doing a heat transfer analysis. I keep getting this error: ERROR: ***TIME INCREMENT REQUIRED IS LESS THAN THE MINIMUM SPECIFIED and ***TOO MANY ATTEMPTS MADE FOR THIS INCREMENT.
Currrently, I modeled an I-steel beam beam that were expose to standard fire curve which is time temperature dependant. on top of the beam is concrete slab. But the concrete slab does not contribute to the analysis. It acts as a attachment to the beam. For material properties of the steel, I included conductivity, density, elastic, plastic,specific heat. for predefined fields, i included initial temperature of 21 degree Celsius. In assembly module, i created instances to attach together all the parts to become the I-beam.
For the heat transfer step, I included:
Step, name="Heat transfer", nlgeom=NO, inc=1000
*Heat Transfer, end=PERIOD, deltmx=10., mxdem=0.5
[b]1., 3600., 1e-05, 500.,
For boundary conditions, I included:
Name: BC-3 Type: Temperature
*Boundary, amplitude=Amp-1
Set-4, 11, 11, 1000.
For loads, I included:
Name: Load-1 Type: Surface heat flux
*Dsflux, amplitude=Amp-1
Surf-12, S, 1000.
I would really appreciate if anyone could help me with these problems of ABAQUS. Many thanks again.
Cheers.
I'm rookie to this forum. I'm having problem with my simulation of shell element for ABAQUS. I'm currently doing a heat transfer analysis. I keep getting this error: ERROR: ***TIME INCREMENT REQUIRED IS LESS THAN THE MINIMUM SPECIFIED and ***TOO MANY ATTEMPTS MADE FOR THIS INCREMENT.
Currrently, I modeled an I-steel beam beam that were expose to standard fire curve which is time temperature dependant. on top of the beam is concrete slab. But the concrete slab does not contribute to the analysis. It acts as a attachment to the beam. For material properties of the steel, I included conductivity, density, elastic, plastic,specific heat. for predefined fields, i included initial temperature of 21 degree Celsius. In assembly module, i created instances to attach together all the parts to become the I-beam.
For the heat transfer step, I included:
Step, name="Heat transfer", nlgeom=NO, inc=1000
*Heat Transfer, end=PERIOD, deltmx=10., mxdem=0.5
[b]1., 3600., 1e-05, 500.,
For boundary conditions, I included:
Name: BC-3 Type: Temperature
*Boundary, amplitude=Amp-1
Set-4, 11, 11, 1000.
For loads, I included:
Name: Load-1 Type: Surface heat flux
*Dsflux, amplitude=Amp-1
Surf-12, S, 1000.
I would really appreciate if anyone could help me with these problems of ABAQUS. Many thanks again.
Cheers.





RE: I'm having problem with ABAQUS simulation of shell model
RE: I'm having problem with ABAQUS simulation of shell model
RE: I'm having problem with ABAQUS simulation of shell model
http://www.egr.msu.edu/software/abaqus/Documentation/docs/v6.7/books/key/default.htm?startat=ch08abk03.html
RE: I'm having problem with ABAQUS simulation of shell model
A SUGGESTED INITIAL TIME INCREMENT OF 1.00
AND A TOTAL TIME PERIOD OF 3.600E+03
THE MINIMUM TIME INCREMENT ALLOWED IS 1.000E-05
THE MAXIMUM TIME INCREMENT ALLOWED IS 100.
THE SIZE OF THE TIME INCREMENT IS CONTROLLED BY -
THE TEMPERATURE CHANGE PER INCREMENT NOT EXCEEDING 10.0
In the mesh step, I have refine the mesh up global size = 0.01. Previously, i use more course mesh and still getting the same error. I have no idea what when wrong with the simulation.
Thanks
RE: I'm having problem with ABAQUS simulation of shell model
RE: I'm having problem with ABAQUS simulation of shell model
>Also, I apply temperature boundary conditions for the whole beam using temperature dependent in Amplitudes.
I hope you mean it different than you've written that. Because when you apply temperature BC, the temperature cannot change free on those regions. So any loads or film conditions will be useless, since you assign the temperature.
It's like fixing all movement in a structural model. A load cannot deform such a body.
RE: I'm having problem with ABAQUS simulation of shell model
I was able to overcome the problem and manage to get the results. Seems to be the problems comes from the fire load configuration applied on the beam surface. Thanks again for your help. I added contact stabilizer and interaction properties due heat contact. The model was finally converge. But, now I'm having another problem. When I want to retrieve the beam temperature against time, the value of the temperature was negative value. I added predefined field which refers to initial temperature condition of 21 degree Celsius for each of the beam surface. I was able to increase the maximum negative temperature to positive temperature but below than 10 degree Celsius. I also applied cavity radiation on all the beam surface due to warning sign (no cavity contact define) when the Job 1 was completed. Do you have any idea to help me this problem?
Really appreciate again to help to solve this problem.
Thanks
RE: I'm having problem with ABAQUS simulation of shell model