Error in running simulation with material card *MAT_260A

[Bhupesh Katiyar]

Dear all,

I am trying to use *MAT_260A material card. Can anyone please help me find the reason for the following errors? All the Part IDs, sec IDs and MAT IDs are properly defined as  other material card like *MAT_36, *MAT_122, *MAT_133 are running smoothly with the same model. Please help. Thanks in advance.

  

*** Error 10246 (KEY+246)

     line contains improperly formatted data

      reading *MAT_STOUGHTON_NON_ASSOCIATED_FLOW cards.

          At line# 473 of file

 C:\Users\BHUPESH\Desktop\1_DE_NAF\4_naf\EDDAnaf.k

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

        3.0

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

 

 *** Error 10450 (KEY+450)

     in keyword command:

       0.0       0.0       0.0       0.0       0.0       0.0

          At line# 475 of file

 C:\Users\BHUPESH\Desktop\1_DE_NAF\4_naf\EDDAnaf.k

 

 *** Warning 10434 (KEY+434)

     The following lines will be skipped:

   1.        0.0       1.0       0.0       0.0       0.0       0.0          

 expanding   memory to      640252 d     2007299  

 expanding   memory to      794368 d     2007299  

 expanding   memory to      819464 d     2007299  

 expanding   memory to      845150 d     2044943  

 

 *** Error 10157 (KEY+157)

     MAT 7 is not found

 expanding   memory to      868098 d     2044955  

 expanding   memory to     1360480 d     2044955  

 expanding   memory to     1589295 d     2044955  

 expanding   memory to     1614686 d     2044955  

 expanding   memory to     1640077 d     2044955  

 

 *** Error 10304 (KEY+304)

     CHECKING MATERIAL INPUT Part ID= 5

     PART ID 5 with

     SECTION ID 1 and

     MATERIAL ID 7 does not exist.

     This is PART 4 in the order of input.

 

 *** Error 10133 (KEY+133)

     input data failed with: 7 errors

Warm Regards

Bhupesh

[l...@schwer.net]

It would be helpful if you include the input lines for MAT_260A especially Lines 473 & 475                              --len

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[Bhupesh Katiyar]

  Hi Len

I am including the input lines for MAT_260A for your reference.

464. *MAT_STOUGHTON_NON_ASSOCIATED_FLOW_XUE_TITLE
465. NAF
466. $#     mid        ro         e        pr       r00       r45       r90     sig00
467.         77.83000E-9  210000.0       0.3      1.58      1.42       1.7    161.42
468. $#   sig45     sig90     sig_b     lcids     lcidv     scale    
469.    163.09    165.08    162.06         8         9      0.03
470. $#     ef0      plim         q      gama         m
471.       1.0       1.0       1.0       1.0       1.0
472. $#    aopt    
473.       3.0
474. $#      xp        yp        zp        a1        a2        a3  
475.       0.0       0.0       0.0       0.0       0.0       0.0
476. $#      v1        v2        v3        d1        d2        d3  
477.       0.0       1.0       0.0       0.0       0.0       0.0

Best Regards

Bhupesh

[l...@schwer.net]

The Card 3 parameter AOPT should be input as an integer,

i.e. 3 rather than 3.0 – see the User Manual Volume II

 

When you correct that error, the other error at Line 475 should go away,

To view this discussion on the web visit https://groups.google.com/d/msgid/ls-dyna2/bea86537-f5e8-4ca9-b654-023acdcaade2n%40googlegroups.com.

[Bhupesh Katiyar]

Thank you Len. I have edited the .k File in word pad and it worked. Can you please tell me what could be the possible reasons for these values of AOPT ( 2.0 and 3.0) ? I am using LS-PrePost  version 4.6. One thing, I also noticed that element material direction is absent for MAT_260A. The element material direction was there for other material cards. Thank you.

With best regards

Bhupesh

[l...@schwer.net]

I am not sure why LSPP does not output integer values for AOPT for MAT_260A. It could just be an oversight by the developers, or a change in the way AOPT was input for older material models requiring material directions, e.g. *MAT_022

 

I know nothing about MAT_260A – I just now common input errors.

 

                --len

[Bhupesh Katiyar]

Thank you Len for your valuable insight. It was of much help to me.

Bhupesh Singh Katiyar

Research Scholar 

Metal Forming Laboratory

Department of Mechanical Engineering

Indian Institute of Technology Kharagpur 

Kharagpur, India - 721302

[James M. Kennedy]

Dear Len,

 

There is a mixture of data type I and F for the AOPT parameter in the LS-DYNA User’s Manual.

Most use F data type; however, there is a few I data types used.

 

A quick glance (could have missed some) of the different data types used for selected data materials.

 

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

 

AOPT – type I input

 

*MAT_ADD_PZELECTRIC

 

*MAT_122_3D

 

*MAT_CODAM2

 

*MAT_KINEMATIC_HARDENING_BARLAT2000

 

*MAT_STOUGHTON_NON_ASSOCIATED_FLOW

 

*MAT_TISSUE_DISPERSED

 

*MAT_SHAPE_MEMORY_ALLOY

 

*MAT_THERMAL_CHEMICAL_REACTION_ORTHOTROPIC

 

 

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

 

AOPT – type F input

 

*MAT_OPTIONTROPIC_ELASTIC

 

*MAT_EXTENDED_3-PARAMETER_BARLAT

 

*MAT_ANISOTROPIC_PLASTIC

 

*MAT_COMPOSITE_LAYUP

 

*MAT_COMPOSITE_MATRIX

 

*MAT_HILL_3R

 

*MAT_HILL_3R_TABULATED

 

*MAT_HEART_TISSUE

 

*MAT_BARLAT_YLD2000

 

*MAT_WTM_STM

 

*MAT_WTM_STM_PLC

 

*MAT_SPECIAL_ORTHOTROPIC

 

*MAT_ORTHOTROPIC_SMEARED_CRACK

 

*MAT_VEGTER

 

*MAT_VEGTER_STANDARD

 

*MAT_VECTER_2017

 

*MAT_TRANSVERSELY_ISOTROPIC_CRUSHABLE_FOAM

 

*MAT_WOOD

 

*MAT_RATE_SENSITIVE_COMPOSITE_FABRIC

 

*MAT_CONCRETE_EC2

 

*MAT_FLD_3-PARAMETER_BARLAT

*

MAT_BARLAT_YLD2004

 

*MAT_KINEMATIC_HARDENING_BARLAT89

 

*MAT_DRY_FABRIC

 

*MAT_CAZACU_BARLAT

 

*MAT_HILL_90

 

*MAT_RESULTANT_ANISOTROPIC

 

*MAT_ANISOTROPIC_THERMOELASTIC

 

*MAT_RC_SHEAR_WALL

 

*MAT_VISCOELASTIC_LOOSE_FABRIC

 

*MAT_MICROMECHANICS_DRY_FABRIC

 

*MAT_PML_OPTIONTROPIC_ELASTIC

 

*MAT_MOHR_NON_ASSOCIATED_FLOW

 

*MAT_LAMINATED_FRACTURE_DAIMLER_PINHO

 

*MAT_LAMINATED_FRACTURE_DAIMLER_CAMANHO

 

*MAT_TABULATED_JOHNSON_COOK_ORTHO_PLASTICITY

 

*MAT_EIGHT_CHAIN_RUBBER

 

*MAT_PAPER

 

*MAT_CF_MICROMECHANICS

 

*MAT_ANISOTROPIC_HYPERELASTIC

 

*MAT_THERMAL_ORTHOTROPIC

 

*MAT_THERMAL_ORTHOTROPIC_TD

 

*MAT_THERMAL_ORTHOTROPIC_TD_LC

 

*MAT_THERMAL_USER_DEFINED

 

 

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

 

Sincerely,

James M. Kennedy

KBS2 Inc.

August 11, 2021

To view this discussion on the web visit https://groups.google.com/d/msgid/ls-dyna2/002101d78e2a%249e6ccca0%24db4665e0%24%40schwer.net.

[Bhupesh Katiyar]

Dear James and Len,

Thank you for sharing the data types used with AOPT for the different material models. It will certainly help all of us. I want to ask one more question regarding the use of MAT_260 A. Sometimes I get a warning message plasticity algorithm did not converge for MAT_260A.  I tried changing the time step still I am getting the same warning message. What could be the possible reason for the same? If you can please share your thoughts on this it will be great.  Thank you. 

Warm regards

Bhupesh

[l...@schwer.net]

Apparently this constitutive model uses an iterative technique, e.g. Newton-Raphson, to solve for some needed quantity, e.g. plastic strain increment; this happens with the Johnson-Cook model MAT015.

 

In the case of MAT015, if the strain increment is too large, the iteration scheme exceeds the internally fixed number of iteration before converging to the internally set tolerance. The only way to decrease the strain increment is to use a smaller time step.

 

As I said before, I know nothing about MAT_260A, only common error messages.

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[Bhupesh Katiyar]

Thank you Len. Keep up the good work. Cheers!