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  1. PatrickdG1998

    Pretension truss matrix (direct stiffness method)

    Yeah, your way of reasoning seems right indeed, @rb1957. I was indeed thinking of that as well...instead of enforcing a certain node to a position, I might better apply the pretension, so that the structure deforms. After that, I can do two things: 1. Apply certain forces in both directions...
  2. PatrickdG1998

    Pretension truss matrix (direct stiffness method)

    Sorry if I'm not completely clear. So in fact I measure the force (in x,y-direction) at the purple node (N4) to hold the mechanism at that specific place (this is what I'm interested in). With pre-tensioning, the location of N4 does not change, but the location of N3 can change (due to the...
  3. PatrickdG1998

    Pretension truss matrix (direct stiffness method)

    I'll clarify it with some pictures. Thanks for the suggestion. In this example, we can neglect the iterative process. Now, we only deal with one iteration (one step in the grid to the right). In the first step, the global system stiffness matrix is determined. The relevant part is used to...
  4. PatrickdG1998

    Pretension truss matrix (direct stiffness method)

    Hi all, Right now I'm working on a mechanical mechanism where nodes are connected via "spring beams". This is very comparable of doing planar truss analysis, but now the deformations are large compared to the system. In my analysis, one of the nodes undergoes a predefined deformation, and the...

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