Material Law for Flexible material

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A
Hi,
I am working on a tensile test of flexible material like plastic film and paper.
Have referred tutorial (RD-3500) for tensile test and they are using mat law 2 Johns zeril for there material.

Can I use the same law for the tensile test of flexible material.?
If yes kindly confirm that will the material behave as a flexible substrate?
 
If there is another law, suggest the material law for flexible material (plastic film & paper) to be used.
 
 
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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited November 2020

    Hi,

    Refer attached zipped file for same.

     

    Regards

    Rahul R

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2016

    Thanks very much Rahul.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2016

    Hi Sir,

    I have a query regarding material law used(MAT LAW 27).

    I checked above shared model,observe the Failure model FAIL_FLD which require forming limiting diagram.

    And also checked the MAT LAW 27 in help and observed following properties(Highlighted);

     

     

    Example(Aluminium)

    #RADIOSS STARTER

    #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

    /BEGIN

    LAW27_void Aluminum

          110         0

                     Mg                  mm                  ms

                     Mg                  mm                  ms

    #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

    /MAT/PLAS_BRIT/3

    Aluminum

    #        Init. dens.

                  0.0027

    #                  E                  NU

                   60400                0.33

    #                  A                   B                   N                                  SIGMAX

                  90.266              223.14               0.375                                     177

    #                  C                EPS0       ICC

                       0                   0         0

    #              EPST1               EPSM1              D_MAX1               EPSF1

                    0.16                0.72               0.999                   1

    #              EPST2               EPSM2              D_MAX2               EPSF2

                       0                   0                   0                   0

    #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

    #ENDDATA

    /END

    #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

     

     

     

    Now, the query is regarding....shall I used these properties instead of using the failure model FAIL_FLD ?

    If yes,then will the behavior of flexible material (film) remains same...?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2016

    Hi,

    Shall I go through these properties?

    Or Is it necessary to use Forming limiting Diagram?

     

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited May 2016

    Please try as per shared deck and even you can try with the data mentioned above. Its always good to try & experience.

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2016

    Thank you sir...

    Will try as per shared data and  above mentioned data.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2016

    HI,

    I am unable to find some properties but working on that.

    Meanwhile also studied the Forming Limiting Diagram.

    Can you suggest that how to get Forming limiting diagram for plastic material?

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited May 2016

    We have a FLD utility in HV. 

    Load HF utilities as shown below. You will find FLD option under the HF pull down menu.See attached screenshot.
     

    <?xml version="1.0" encoding="UTF-8"?>FLD.JPG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2016

    Hi Sir,

    As per your suggestion,I used HF utility and loaded FL Curve.

    But, I am getting the same FL Curve for the same model with different material properties.

    Also I am getting same FL Curve for 2 different models as well.

    Is it the case that FL curve for 2 different models and 2 different materials are same?(Please see attachments)

    Plus I am using FL curve obtained in different test conditions. Is it right method?

     

    <?xml version="1.0" encoding="UTF-8"?>HDPE(plastic material) -FLC.PNG

    <?xml version="1.0" encoding="UTF-8"?>Alumimium -FLC.PNG

    <?xml version="1.0" encoding="UTF-8"?>Different model.PNG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2016

    Hi,

    I run the deck shared by you and import the h3d file in HV.

    Then load the FLC by using HF utility,getting the same curve for this model also(refer the attachments). 

    Also FLD used in a deck is not same as of FLD which is obtained in HV.

    Kindly clarify the same.

     

    <?xml version="1.0" encoding="UTF-8"?>b1.PNG

    <?xml version="1.0" encoding="UTF-8"?>b2.PNG

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