Element distortion during rollover analysis

RAMGANESH
RAMGANESH Altair Community Member
edited October 2020 in Community Q&A

Dear All,

 

I am getting the element distortion of the member in my model during rollover analysis,due to which there is sudden decrease in time step and thus increases the solution time.

 

I had checked the model but can't able to find the reason for the distortion of that particular member .

 

Kindly give your guidelines.

 

Thanks

RAM

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<?xml version="1.0" encoding="UTF-8"?>new1.png

<?xml version="1.0" encoding="UTF-8"?>new2.png

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2016

    Hi Ram,

     

    Cross the check the material used for those elements.

     

    If elements are fine, then use fully integrated element formulation and check again.

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited July 2016

    Dear Prakash,

     

    I have checked the material used it for those elements.All are fine.

     

    Fully  integrated element formulation ???

     

    Thanks

    RAM

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2016

    Assigning wrong material properties can cause these elemental behavior. 

    Hourglass is another issue. Hourglass modes are element distortions that have zero strain energy. Hourglassing may easily lead to excessive distortions. To control hourglass assign Ishell-24 and N-5 for shell elements. And for solids use Isolid-14.

    Please try with these options.

     

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited July 2016

    Dear George ,

     

    After changing the values of Ishell-24 and N-5 and running the file.

     

    Timestep shows very less and thus show solution time remaining of 32 lakh seconds.

     

    11/07/2016
     CYCLE    TIME      TIME-STEP  ELEMENT          ERROR  I-ENERGY    K-ENERGY T  K-ENERGY R  EXT-WORK MAS.ERR
         0   0.000      0.1037E-06 NODE     1053868   0.0%   0.000      0.7471E+08  0.1907E+05   0.000       0.000    
         ANIMATION FILE: ssc93A001 WRITTEN
       100  0.1037E-04  0.1037E-06 NODE     1053868 -30.7%  0.2712E+05  0.5170E+08  0.2532E+05   1794.       0.000    
       200  0.2074E-04  0.1037E-06 NODE     1053868 -30.7%  0.6072E+05  0.5167E+08  0.2754E+05   3587.       0.000    
       300  0.3111E-04  0.1037E-06 NODE     1053868 -30.7%  0.1047E+06  0.5163E+08  0.2541E+05   5379.       0.000    
       400  0.4147E-04  0.1037E-06 NODE     1053868 -30.7%  0.1508E+06  0.5158E+08  0.2632E+05   7171.       0.000    
       500  0.5184E-04  0.1037E-06 NODE     1053868 -30.7%  0.2001E+06  0.5153E+08  0.2952E+05   8961.       0.000    
       600  0.6221E-04  0.1037E-06 NODE     1053868 -30.7%  0.2496E+06  0.5148E+08  0.3369E+05  0.1075E+05   0.000    

     

     

    Kindly give your guidelines.

     

    Thanks

    RAM

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2016

    Hi Ram,

    It is shown in the .out file that node 1053868 creates a low time step. For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified. Please check this node.

    When you run next time, try running by imposing a time step so that the total simulation time can be reduced.

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