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Hye there,


 


I'm a beginner user of the Hypermesh. I want to setup an analysis of a panel dentability simulation, using Optistruct.


The load is applied via a ball indenter, with an initial 1mm gap between the panel and the ball indenter. The load of 200N applied perpendicular on the panel, and has to simulate a push/release action, so that a maximum and a permanent deformation of the panel can be determined.


 


Model setup done:


i)   Since the panel will undergo plasticity and the load varies over time, I set the analysis for a NLGEOM loadstep.


ii)  A contact interface between the ball indenter and panel was generated. PCONT properties was used to replace the contact's property option. PCONT properties with active GPAD_OPT and PCONTX (STFAC=0.01 & GAP=0.5)


iii) A TLOAD1 was setup, with the TABLED1 with values [X(1)=0,Y(1)=0], [X(2)=1, Y(2)=1] & [X(3)=2, Y(3)=0]


iv) EXCITEID of TLOAD1 used DAREA load type, with dof x (local coordinate system, perpendicular to the panel) set to 200 (200N)


v) NLGEOM(impl static) loadstep used. Inserted SPC,NLOAD (set to TLOAD1), NLPARM & TTERM=2.0


 


However, when I tried to run the analysis, ERROR #1388 popped up.


Referenced ID 9 (ID of TLOAD1) in NLOAD, but missing in BULK DATA.


 


When I change the load input to a displacement input, using NLOAD1 load collector with SPCD as EXCITEID, no error occurred during analysis computation.


 


Please help me in determining what's needed to be changed.


 


Shukri.


 


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Hi Shukri,


 


Please refer NLOAD1 in NLOAD for NLGEOM analysis.


 


TLOAD1 is for transient dynamic analysis.


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Do I change the DAREA to SPCD too?


 


When I used DAREA, I got a fatal ERROR #4079, Non-convergent nonlinear iterations for subcase 1.


When I used SPCD, I got ERROR #4028, No load is defined in NLGEOM subcase 1.

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What is the EXCITED type are you using?


 


If the excitation type is NOT enforced motion, then you need DAREA.

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I finally got it work after a few tweeks on the test setup.


I reduced the gap between the ball indenter and the panel from 1mm to 0.5mm.


And in the PCONTX setting, I increased the GAP function from 0.5 to 2.0mm.


 


So far, the analysis managed to complete its calculation.


 


Thanks for all the help and guidance.


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