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bilinear constitutive material model

bilinear constitutive material model

bilinear constitutive material model

(OP)
Hello,
i'm trying to create a material model with differing yield strains in tension and compression. The material is essentially isotropic.
I have used the cast iron material model for this (please let me know if there is a better option).
I have defined it with the following code:

et,2,solid185,,2
tb,cast,bb,,1
tbtemp,0
tbdata,,,,,,,
!ENTER COMPRESSION DATA
TB,UNIACOMP,bb,1,3,COMP            
TBTEMP,0                
TBPT,,SN_Y_C,SS_Y_C            
TBPT,,SN_F,SS_F_C            
tbpt,,0.01001,0                            
!ENTER TENSION DATA
TB,UNIATENS,bb,1,3,TENS            
TBTEMP,0
TBPT,,SN_Y_T,SS_Y_T            
TBPT,,SN_F,SS_F_T             
tbpt,,0.01001,0                

all the variables used have been defined previously.
But when i try to solve the problem i get the following error messages:


 *** ERROR ***                           CP =      22.312   TIME= 14:36:30
 For material 1 at temperature 0, the initial slope (120.8223) of the    
 stress-strain curve based on the TB,UNIAXIAL table with option (TENS)   
 is greater than EX (6.0134717-154).                                     

 *** ERROR ***                           CP =      22.312   TIME= 14:36:30
 TB,UNIAXIAL table for material 1 at temperature 0 has a tangent slope   
 of its stress-strain curve (134.261918) greater than EX                 
 (6.0134717-154).   

Could anybody help me with how i need to define the material properties.

Thanks in advance!
 

RE: bilinear constitutive material model

Hello,

please, i've the same problem with cast iron option.
Could someone help us?

Thanks a lot

RE: bilinear constitutive material model

Hi,
I think that the slope before yield should match with each other.  

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