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Shrinaath

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  1. Shrinaath

    Time Step

    HI IVAN thanks can u share me the modified model with ideal time step...
  2. Shrinaath

    Time Step

    sorry simulation is not yet completed. i have shared the _0000.rad & _0001.rad file with you please verify with it this is my loading curve, is this not appropriate 2D_SHELL.h3d
  3. Shrinaath

    Time Step

    please find the files 2D_SHELL_0000.out 2D_SHELL_0001.out 2D_SHELLT01
  4. Shrinaath

    Time Step

    thanks ivan i tried with time step DT/NODA/CST 0.144E-02 i am having mass error and energy error as follow RESTART FILES: 2D_SHELL_0001_[0001-0001].rst WRITTEN NC= 605000 T= 8.7604E+02 DT= 1.4481E-03 ERR=-60.0% DM/M= 3.2230E-02 ELAPSED TIME= 1579.40 s REMAINING TIME= 304910.89 s NC= 605500 T= 8.7676E+02 DT= 1.4481E-03 ERR=-60.0% DM/M= 3.2230E-02 ELAPSED TIME= 1580.85 s REMAINING TIME= 304938.64 s NC= 606000 T= 8.7749E+02 DT= 1.4481E-03 ERR=-60.2% DM/M= 3.2230E-02 ELAPSED TIME= 1582.20 s REMAINING TIME= 304945.54 s NC= 606500 T= 8.7821E+02 DT= 1.4481E-03 ERR=-60.3% DM/M= 3.2230E-02 ELAPSED TIME= 1583.49 s REMAINING TIME= 304941.06 s NC= 607000 T= 8.7894E+02 DT= 1.4481E-03 ERR=-60.4% DM/M= 3.2230E-02 ELAPSED TIME= 1584.80 s REMAINING TIME= 304941.00 s NC= 607500 T= 8.7966E+02 DT= 1.4481E-03 ERR=-60.5% DM/M= 3.2230E-02 ELAPSED TIME= 1586.16 s REMAINING TIME= 304950.37 s ANIMATION FILE: 2D_SHELLA045 WRITTEN NC= 608000 T= 8.8038E+02 DT= 1.4481E-03 ERR=-60.6% DM/M= 3.2230E-02 ELAPSED TIME= 1587.61 s REMAINING TIME= 304976.63 s NC= 608500 T= 8.8111E+02 DT= 1.4481E-03 ERR=-60.7% DM/M= 3.2230E-02 ELAPSED TIME= 1588.93 s REMAINING TIME= 304978.07 s NC= 609000 T= 8.8183E+02 DT= 1.4481E-03 ERR=-60.8% DM/M= 3.2230E-02 ELAPSED TIME= 1590.30 s REMAINING TIME= 304988.53 s
  5. Shrinaath

    Time Step

    hi i having problem in time step. i checked the minimum time step in the model that comes around 1.934e-03. when i run the model in radioss with out mass scaling it takes the DT= 0.1448E-02. but usually the minimum time step * 0.9 will be taken in radioss as initial time step, when we calculate that 0.001934 * 0.9 = 0.0017406 what is reason behind this
  6. Shrinaath

    roll bending

    Hi @Ivan i facing problem during running the job that my simulation remaining time is keep on increasing with error percentage. i attached the text file ERROR.txt for reference. does the model have any issue in the contact?? i have attached my model file please check 2D_SHELL_0000.rad 2D_SHELL_0001.rad 2D_SHELL_0002.rad
  7. Shrinaath

    roll bending

    thanks your reply i will read those journals. i am having a doubt does MAT36 will used for the springback analysis??
  8. Shrinaath

    roll bending

    hi, if we use the damping for controlling the vibration in the plate, does it affect the spring back???
  9. Shrinaath

    roll bending

    hi @Ivan i will do some iteration on this Rayleigh damping coefficient and lets u know if i had any difficulties..... i having doubt in the spring back i used the implicit spring back option as mentioned in the example 25 but my results are not that much correlating . In implicit spring back what kind of solver should we use in tutorial it mentioned /IMPL/SOLVER/2 but in the file which is mentioned in the tutorial DBEND_44 they mentioned /IMPL/SOLVER/1 i have attached the tutorial and file from tutorial for reference. DBEND_44_0002.rad
  10. Shrinaath

    roll bending

    hi @ivan thanks for your reply. In Rayleigh damping (/DAMP) how to find the values of alpha & beta. And if i apply the values for alpha and beta means the time step which i imposed through Advance Mass Scaling (/AMS) is not taken into consideration.The simulation runs on with the actual time step... What is the reason behind this issue.
  11. Shrinaath

    roll bending

    hi @Ivan simulation works fine but the plate (2D shell model) is vibrating much. i have applied load gradually. what might be the issue in the model . refer the 1PASS.avi video i have attached.
  12. Shrinaath

    roll bending

    Hi @Ivan thank you, its clear...... energy error% it is goes on increasing CYCLE TIME TIME-STEP ELEMENT ERROR I-ENERGY K-ENERGY T K-ENERGY R EXT-WORK MAS.ERR 2447500 2985. 0.1239E-02 NODE 27 -89.9% 230.2 9.932 5.925 2448. 0.000 ANIMATION FILE: 2D_SHELL_A5972 WRITTEN 2448000 2986. 0.1239E-02 NODE 27 -90.0% 229.3 10.88 5.927 2449. 0.000 ANIMATION FILE: 2D_SHELL_A5973 WRITTEN ANIMATION FILE: 2D_SHELL_A5974 WRITTEN 2448500 2987. 0.1239E-02 NODE 27 -90.0% 228.4 11.67 5.930 2450. 0.000 ANIMATION FILE: 2D_SHELL_A5975 WRITTEN 2449000 2987. 0.1239E-02 NODE 27 -90.0% 227.7 12.38 5.935 2450. 0.000 ANIMATION FILE: 2D_SHELL_A5976 WRITTEN 2449500 2988. 0.1239E-02 NODE 27 -90.0% 227.0 12.98 5.919 2451. 0.000 ANIMATION FILE: 2D_SHELL_A5977 WRITTEN i didn't specify any mass scaling /DT/NODA/CST or /DT/AMS
  13. Shrinaath

    roll bending

    hi @Ivan i am simulating the manufacturing process 3 roll bending process in radioss, early i used 3D model now i am trying with a 2D model, since plate thickness 3 mm For that i extracted the midsurface of the plate and assign the thickness of the plate as 3mm. i used P1_shell ishell=24 N=5 thick=3 Istrain=1. i assigned the material property to roll and plate, boundary condition, contact every thing as same. shell is bending only in the region inside the rolls, region outside the roll is not bending i have marked in the image . does i have used any shell parameters wrongly. i having problem in imposed velocity also that the rotation of roller. the roller is not rotating in both the direction i have assigned negative sign(-) to change the direction of roller in curve editor. i have attached my file pls check thanks 2D_SHELL_0000.rad 2D_SHELL_0001.rad
  14. Shrinaath

    MATERIAL CURVE

    hi what is the reason in elastic-plastic material like MAT36 we should use the effective stress-strain curve thanks
  15. Shrinaath

    Error in radioss

    hi thanks for replay some where in unit system, element length & time step i might have made mistake i think i used ton mm mpa s unit system i made mistake in density it is 2.63e-9 please change that and check the model file... bend_0001.out
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