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Hi, While doing a pretension analysis and want to perform loading and unloading analysis with non-linear considerations.Below is how my loadsteps are structured. Loadstep 1 - Pretension SPC NLPARM PRETENSION LOAD Loadstep 2 - LOAD1 SPC LOAD1 NLPARM Subcase Option: CNTNLSUB - (Loadstep1) Loadstep 3 - UNLOAD1 SPC NLPARM Subcase Option: CNTNLSUB - (Loadstep2) With this procedure only Loadstep1 is running and the run gets sopped. I have 2 questions here Q1: Do I have to use STATSUB(PRETENS) along with CNTNLSUB in Loadstep2? Q2: If the above is true then do I also have to use the same STATSUB(PRETENS) in Loadstep3 considering that CNTNLSUB is present? Attached are the snapshots for the Loadsteps. Kindly help.
Hello Everybody, I've been struggling with NLGEOM analysis with CNTNLSUB since yesterday and I still don't understand a few things. What I want to do is to load a steel plate for 1 s and in the next step to unload it. I load the structure with one Force in Z direction NLOAD in the subcase 310. NLOAD activates TABLED1 where the basic linear function is defined x=0, y=0; x=1, y=1. In the next subcase 311 I use CNTNLSUB = YES, the same SPC and the same NLPARM. The nonly difference is that I do not define any load, since it should be the step, where the structure is being unloaded. Below you can find the plots I got and short descriptions of respective graphs. On the Displacement - Force plot, you can see a discontinuity between the curve belonging to the SUBCASE 310 (loading) and SUBCASE 311 (unloading). What is more, the force increases in the second step despite the lack of any loading force. The force is being increased up to 8000 N, which is a doubled value of the load defined in the first step. On the Time-Displacement plot the curve is continuos. However, the displacement is being increased till the end of the simulation (as expected based on the graph Displacement - Force). The Time-Load graph shows discontinuity again. In the beginning of unloading step, the force seems to be 0 N and than in the next increment gets back immidiately to the value, as if it was being increased, according tothe linear function present in the loading step. I would be grateful for some hints / tipps / explanation, where I make a mistake and if it is possible to create a proper loading - unloading time dependent simulation in two subcases with use of CNTNLSUB. You can find my input-deck in the attachment. nlgeom_4060_H380LAD_0p6mm_1300_CNTNL_test_01.fem
Hello, I'm trying to load an .hm file created with a Student Version of the HyperWorks 13.0 (using Optistruct) into a comercial version of HyperMesh, but the following message appears: "The file specified is not a hypermesh database". What should I do? Thank you.