lumbar spine loads

Main Forum
1

Hi sir
I am working recently on the fea of lumbar spine. I export l5,l4,l3,l2,and l1 from anybody human model and assembled in the 3 matic. Now im trying to export loads on all five vertebrae.But after applying convertor only l5 loads are exporting. Codings used are following-

AnyMechOutputFileForceExport FE_Out = 
{
   FileName = "Output\spineloads.xml";
  UseRefFrameOnOff = On;
   AnyRefFrame & ref1 = Main.HumanModel.BodyModel.Trunk.SegmentsLumbar.L5Seg;
  AllSegmentsInStudyOnOff = Off;
  XMLformatOnOff = On;
  
  //AllSegmentsInStudyOnOff = Off;
  
  AnySeg &L5Seg = Main.HumanModel.BodyModel.Trunk.SegmentsLumbar.L5Seg;
  
};

AnyOperationShellExec ConvertToAbq={
Show=On;
FileName ="Output\AnyFE2Abq\AnyFE2Abq.exe";

Arguments = “-i .\Output\spineloads.xml -o .\Output\Outputspine2.inp -m .\Output\LUMBAR2.inp -rsegment -t” +strquote(“1000 0 0 0 1000 0 0 0 1000 0 0 0”);
WorkDir=".\ ";

};
Iam confused which segment will used as reference point for generating .xml file.Plz suggest me the right reference point.
Thanks
Regards,
Mohit

2

Mohit,

in your example the ref. frame will be corresponding to the L5Seg ref. frame. To export all of them you need to provide more segments.

The final task will depend on how you have your FE mesh. Is that a single mesh block in the Abaqus input deck? Or do you have different parts? I think the scenarios might differ a little.

But in any case it involves a bit of manual/scripting work.

The most transparent approach would be to export data for each vertebra separately (make sure you export loads in the ref. frame of the FE mesh). Once you have all files, you need to combine (copy/paste or script) all these files into one. And how you do that will depend on your current setup.

I would recommend to start with 2 vertebra - once you have that it will be easy to repeat everything.

What you will need to take care of is the node indexing (each file will have repeated node number for muscle attachments, try making an offset). Otherwise I think it might be simple enough.

Kind regards,
Pavel