Maximum increment during NLSTAT Analysis

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?

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Altair Forum User

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.

Altair Forum User

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

Altair Forum User

Hi Robert,

I will check at my end and I will share my findings soon.

Altair Forum User

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.

Altair Forum User

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.

Altair Forum User

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.