Maximum increment during NLSTAT Analysis
Altair Employee Hello,
I want to prescribe a maximum increment during a NLSTAT analysis. Because I need a number of reaction forces over a presribed displacement (detailled force-discplacement curve).
I tried with a high number of NINC in NLPARM, with DTMAX in NLPARMX and with FIXTID in NLPARMX pointing to a table.
None worked.
Can you help me?
Answers
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HI,
I think you can control number of increments using NLPARM,
NLPARMX may not help in your case as it is useful only in non linear geometric analysis.
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How to?
In my example (also without NLPARMX) it makes no difference if I use NINC=20 or NINC=100 in NLPARM. I start with DT=0.05, but during the analysis the increment becomes too large for my application (>0.05).
Best regards,
Robert
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Hi Robert,
I will check at my end and I will share my findings soon.
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Hi @RD
Not sure if this is what you are looking for, try MAXITER on NLPARM which limits number of implicit iterations for a load case.
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I want to get more increments, not less. So MAXITER is not what I am looking for.
Let's say I want an output at least every 0.1 pseudo time intervals, when pseudo termination time is 1.
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RD,
You can try with Non linear transient analysis where you can specify time increment and number of time steps using TSETP.
You need to specify LGDISP to run a non linear transient analysis.
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