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  • Users: Gavla
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  1. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Thank you very much for your help Doug.
  2. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hi Doug, I have actioned your comments and re-run the model with only one load factor. Please find attached. As asked above, I can view the plate contour stress results, but would like clarity on how to view the tensile and bolt bearing forces (is this possible in this model?). I would like to...
  3. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Thanks Doug, okay will try that. One question on that though, if I go into the load increments there is a load case and a freedom case...do i set the increment to just one and put a factor of 1 in for both cases and run like that? I am not across what the freedom case is?
  4. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hi Doug, I ran it with the non-linear solver, which took a long time actually. It is suggested in the Webnote and also I wanted to try and see if I could try and analyse with node increments, to produce some sort of load capacity graph that will tell me the load at which it fails (by...
  5. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Thanks for looking at that Doug. The material I am investigating is Glass Fibre Reinforced Polymer (if interested have a look at Wagners CFT webpage, based in Toowoomba Australia) Ideally I would be modelling it using the correct ply layups that I know you can do in Strand, however, I do not...
  6. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hi once again Doug, I think i have sorted this now by moving away from bricks to a plate mesh. Thank you so much for your help. Regards Gavin
  7. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Thank you once again Doug. I have re-built this model again from scratch. I am pretty certain all blocks connected, have adopted correct restraints, no links included etc, and still getting a material warning and strange results. I am lost as to how to fix it. I am now trying to build this...
  8. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Thanks Doug, Yes I had come to that conclusion about the brick mesh also. I still do not understand though why if you subdivide a brick surface, the A,B&C directions can vary sometimes. It makes it very difficult if you need to subdivide an exsiting model. However, it is probably just easier to...
  9. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Not sure i model attached last time. Sorry for spamming the thread with multiple posts!https://files.engineering.com/getfile.aspx?folder=34ff10d4-9658-475e-8383-e952c36b6b18&file=Wagner_4_w_stiffeners_model_25mm_mesh.st7
  10. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hello again, I think the issues in the last model started when i tried to subdivide the mesh. I have noticed that this has pretty much ruined the mesh. I am struggling with how to subdivide in a controlled manner, especially when the A & B axis for subdividion are oriented differently from one...
  11. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Thanks Doug, Please review the attached model. I have tightened the mesh and the deflected shape is a bit crazy. Looked more reasonable with a larger mesh. Now it looks very 'spikey' for lack of a better term. I had hoped for a smoother curve. Also still getting the same warnings. I really...
  12. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hello again, I ave now resolved the axis issue so please disregqrd. However, if you have any coments on the model and solver warning, that would be appreciated. Regards Gavin
  13. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hi once again, Can you please confirm how one might be able to identify the direction of the local axis? For example, I need to model orthotropic properties, which have maximum material properties in the long direction (pultruded direction). So max properties should be along the member, with...
  14. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hello again, I will try and follow on from my earlier post rather than start a new one. I have a flexural member built from plate elements in Strand7. I applied load to the top of the member, split 50/50 over the webs (it is a closed member). However, the point loads are buckling the top in an...
  15. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Thanks Doug, I have deleted the beams and subdivided the plate and now all works ok. I am a mature student so using the eductaional license,so limited access to Webnotes unfortunately. Regards Gavin
  16. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hi Doug, Thank you so much for getting back so quickly. Clearly I do not really know what I am doing. I agree that I had intended for the model to consist of plates only, so will attempt this and let you know how I get on.
  17. Gavla

    Strand7 help - Global Stiffness Matrix Singular error

    Hello, I have read a number of posts regarding this error, noe of which have helped me to ge this to run. Mine is a simply supported beam in three point bending, though the cross section conssits of three SHS stacked with plates top and bottom (a double web i-beam of sorts). Is anybody able to...

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