topic Trying to define a Non linear Material for a Non linear static analysis in Fusion Support Forum

Trying to define a Non linear Material for a Non linear static analysis

gamemail.seb — Mon, 12 Aug 2024 17:02:56 GMT

Hello,

So for the past couple of days I am trying to do a Non linear static analysis for a part that I designed. The material I want to analyze is TPU plastic , which is a material that doesn't exist in both the normal material Fusion library nor the Non linear one. I have read the instructions on how to add a Non linear material to the library and I have followed the thoroughly, however when I try to run my simulation an error pops up that consists of this;

Error: MAXIMUM NUMBER OF BISECTIONS PERMITTED REACHED
Cause : The bisection limit specified on the NLPARM (static solutions) or a TSTEPNL (transient
solutions) Bulk Data entry for the current load increment has been reached (default
5).
Action : Increase the bisection limit and/or investigate the reason for the load bisection.See
message E5075 above.

My analysis runs perfectly fine with the same parameters both when I run it in the Non linear mode and I choose a non linear material from the fusion library for example the low strength aluminium, and it also runs fine when I run a normal static analysis with a material like Silicon Rubber. (which is the material that I edit and transform its properties to TPU and define it as Hyperelastic)

Here is a screenshot of the properties I have listed to my material.

I would really appreciate it if you take a look to my results and help me solve my problem

Kind regards, Seb

Re: Trying to define a Non linear Material for a Non linear static analysis

henderh — Mon, 12 Aug 2024 20:41:57 GMT

Hi @gamemail.seb,

Could you attach the design that is having problems converging with the nonlinear material?

File > Export... > f3d (or f3z) file type

I'll ask development to investigate if there isn't an issue with the study setup.

Best regards,

Re: Trying to define a Non linear Material for a Non linear static analysis

gamemail.seb — Tue, 13 Aug 2024 03:54:57 GMT

Sure , I am attaching it below.

Case No5 is the problematic one with the issues I listed above.

Re: Trying to define a Non linear Material for a Non linear static analysis

henderh — Thu, 15 Aug 2024 15:49:23 GMT

Hi @gamemail.seb,

The reason the solver fails to converge is because the 50.0 bar pressure load magnitude is too high for the low material stiffness. If the magnitude is decreased to 0.005 bar the solve can converge. The actual displacement result is shown here: