RADIOSS All strains are 0.000e+00 whilst I have stresses

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi there,

 

currently I am running explicit FE simulations with Radioss Block.

The simulations are setup using a 'master' file, that calls a number of input files.

The input files comprise sub-assemblies of the total model.

 

Now, in my results I am able to make a contour plot of the (Von Mises) stresses. Maximum Von Mises stress is 275 MPa.

The animation files show indeed excessive deformation of the component in a specific include, which is expected.

However, when trying to plot the strains, it seems results remain 0.000e+00 for the entire simulation time for this component.

I am able to view both stresses and strains on the other components.

 

In my engine file I do request to output the strain tensor:

#-----------------------------------
# Animation file control
#-----------------------------------
/ANIM/DT  
0.000000e+000 1

/ANIM/SHELL/TENS/STRESS/ALL
/ANIM/SHELL/TENS/STRAIN/ALL

 

 

Could it be an issue on the material or property card?

 

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/PLAS_JOHNS/14
material_name                                                                                
#          RHO_I
2.800000E-06                 0.0

#                  E                  Nu     Iflag

                70.0                 0.3

#                  a                    b                    n           EPS_p_max            SIG_max0

                 0.2                 0.3                 0.5                          0.0                   0.275

#                  c   EPS_DOT_0     ICC   Fsmooth               F_cut               Chard

                 0.0                 0.0         0                0                   0.0                    0.0

#                  m              T_melt              rhoC_p                 T_r

                  0.0                    0.0                     0.0                  0.0

 

Is anyone aware of the possibility to loose the strain for plotting purposes, whilst the stresses are still present?

 

 

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2017

    Hi,

    Strain tensor is output only if Istrain =1 in shell property (/PROP/TYPE1, /PROP/TYPE10, /PROP/TYPE11, /PROP/TYPE16 and /PROP/TYPE17), except for material laws 15, 19.

    Please try with this option.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Excuse me for the late feedback.

     

    Indeed, I can plot strains now on my component. thanks! :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

     

    On the property card the value Istrain = 0 (such that it was looked up on the /DEF_SHELL card).

    On the /DEF_SHELL Istrain = 0 (such that it would take the default value, i.e. Istrain = 2: no)

     

    Istrain: Compute strains for post-processing flag

    (Integer)

    = 0: default, set to 2

    = 1: yes

    = 2: no

     

    I have changed the parameter to Istrain = 1; for both the PROP card and the /DEF_SHELL

     

     

    Thanks for the reply!

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