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Reading off data from output database file when UMAT is applied

Hi ~!

i tried to analyze stress-strain distribution when material is subject to self shrinkage due to drying.

first, i performed water diffusion analysis. second, i performed static analysis with predefined fields data 

from .odb file of the previous analysis results. and it was successful. 

but when i try to use subroutine 'UMAT', .odb file of the previous analysis becomes not availalbe to be read off.

the only thing changed to use 'UMAT' in input file is described below.

---------------------------------------------------------------------------------------------  

from :

** MATERIALS

** 

*Material, name=Concrete

*Elastic

26770, 0.2

*Expansion, field=1

 3.8e-9

to :

input file using UMAT:

** MATERIALS

** 

*Material, name=Concrete

*USER MATERIAL,CONSTANTS=4

26770,0.2,3.8e-9,271557

*Depvar

20

and i didn't change parameters for predefined fields, which is 

** Name: Predefined Field-1  

*field, variable=1, file=D:/D/test/test4/test_1304303.odb, bstep=2, einc=2, output variable=NNC 

------------------------------------------------------------------------------------------------

an erorr message says

 ***ERROR: THE OUTPUT VARIABLE PARAMETER CAN ONLY BE USED WHEN READING RESULTS 

           OFF THE OUTPUT DATABASE.

is it impossible to read data from .odb file when 'UMAT' is applied in input file??

i also tried to read data from results file but it also failed because of record key problem of variable 'NNC'.

any comment would be appreciated.

thanks.   

 

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