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gslee

How do I fix the time step in nonlinear transient analysis?

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Hi,

 

My loadstep, TSTEP and NLPARM are as follows

image.png.3e55a30feff8b485292c4af8a4511069.pngimage.png.83e3dc3ffa6bee0c4d9bf3101ffccf17.pngimage.png.28c2c5a0e6832950c397bdb1f1b4d6db.png

 

In the result, the number of the time data is 432. (Its time step is not 0.0001)

 

I learned that when NLPARM and TSTEP are used together, DT on NLPARM overrides DT on TSTEP.

 

This result is caused by incremental load based approach in OptiStruct?

 

Thanks

 

 

 

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I think there is no way to fix the time step in pdf file.

 

image.png.ff6c7104b237044bc05ead85ec65c407.png

In nonlinear transient analysis, I can control only initial time step size?

 

Thanks.

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Hi Rahul,

 

Why do you defined DT and TTERM equal (0.1) in the pdf example you shared? It's not supposed that TTERM should be set to the whole subcase time? As stated in the optistruct help.

 

TTERM on NLPARM is to be input based on subcase time (not total time). For instance, in a multiple subcase setup, if subcase 3 starts at 2.0 and you want it to end at 3.0, then TTERM for subcase 3 should be set to 1.0 (since it is based on subcase time).

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