Siddeshwaran

siddeshwaran

Hi,

 

i am defining a non-linear material property in optistruct as below

$HWCOLOR LOADCOL*                     10       3
TABLES1*              10
*       
*                    0.0             0.0          0.0005           100.0
*                 0.0010           200.0          0.0014           300.0
*                 0.0019           400.0          0.0024           500.0
*                 0.0029           600.0          0.0030           620.0
*                 0.0031           648.0           0.004           672.0
*                  0.013           696.0            0.03           720.0
*                  0.058           744.0             0.1           768.0
*                  0.158           792.0           0.235           816.0
*                   ENDT

i am getting an error ' 
 *** ERROR # 3021 ***
 The plastic material data specified on the TABLES1 bulk data entry ID=10
 is invalid. The slope after the initial yield point is not less than the
 Young's modulus. (  2.000000e+05 >=  2.000000e+05 ) at the segment 2.
  
 *** Run terminated because of error(s) in the input data.
  

 

but i checked the slope of the curve. it correct. what could be the issue?

 

 

Mario_21478

Hello,

 

If your elastic modulus is 2e5, the error message is correct.

Since for the first plastic slope 100/0.0005 = 2e5, exact same slope and this is not allowed.

 

The strain in the table starts at plastification, means 0,0 is end of elastic range.

 

Best Regards,

Mario