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Andrea
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Maybe you are speacking about two different tecniques for seismic analysis. 1) Use response spectrum (acceleration Vs period) combined with modal analysis and CQC or SRSS combination) 2) Use the accelerogram (acceleration Vs time) General method is…
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Have you received an answer from the CCX forum? During last period I didn't follow any forum
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See this Blog about direct and iterative solver https://www.comsol.com/blogs/much-memory-needed-solve-large-comsol-models/
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If you are performing static analysis you can try iterative solver. See precedent post. From CCX Manual: SPOOLES is also very fast, but has no out-of-core capability: the size of systems you can solve is limited by your RAM memory. With 2GB of RAM…
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See CCX manual about spooles solver. I think that depends from your RAM. If I'm rigth you must consider the number of equations and not number of elements Regards
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Maybe RBE: Rigid Body Element
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By Mecway I think that is necessary to modify manually the inp file (CCX custom step contents) adding the step relative to the dynamic one. With internal solver I don't know.
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Try to change *Contact OUTPUT with *Contact FILE. I ran the solver and Mecway opens the frd file but is very slow. With CGX the solution on the attached picture Regards
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*ERROR in e_c3d: nonpositive jacobian determinant in element Free mesh is fast but can lead to neglect the quality. This error is often linked to a very small element volume. Refine the mesh is generally a good solution but is better to made a par…
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Maybe depends from the CCX compiled version for Windows. I use the versions contained on CalculiX Launcher and both iterative solvers are selectable. Iterative Cholesky is generally faster than Iterative Scaling.
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If the spooles solver requires a lot of memory try SOLVER=ITERATIVE SCALING It is slower than spooles (which is the default solver)
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Applying bending moment through the rot node the stress distribution is correct (see attached picture)
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RBE if you need a rigid behaviour of a surface or body. Ref Node if you want to apply forces or translational constraints to the RBE Rot Node if you want to apply moments or rotational constraints to the RBE Attached picture: a force is applied to …
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Maybe it depends from the format of frd file that's completely binary. See CCX manual: *Node print - *node output and paragraph "Output variables"
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With CCX solver *Time Points keyword could be a solution
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Example
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I select all variables ( or single column) on the SL table - CTRL+C- CTRL+V on excel
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I will point out the problem with more clarity. On more complex models is difficult to manage double nodes because merging nodes with tolerance too high could cause mesh problems. For example the two models on picture: after merging nodes with 0.5 m…
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Yes...is a tolerance problem but these nodes (double) have the same coordinates. Thanks
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Merging nodes in Salome there are no problems. In Mecway some elements continue to be disconnected. In fact the node number is different: Merging double nodes in Salome 1260 Merging double nodes in Mecway 1288
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Yes open crack!
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CGX shows deformations on both ways so the real behaviour is not an oscillation. Check the displacement magnitude vs time step on g direction to be sure. Simplify constraints to understand where is the problem. I ran the solver and is strange that a…
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Why *Rigid Body? Try locking the cube with simple node constraints.
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Which version of CCX are you using?
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Build your assembly. Leave unsuppressed only one component and export it as a step file. Make the same for all components of your assembly (only one at time). Import on Mecway one componet at time. All components will be placed correctly Regards
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twilliams55: for a more quick calculus there is an approximate formula on "Roark's formulas for stress and strain"
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...but don't forget classical theory. For my opinion is better to start by hand calculation (or spreadsheet) because the basic theory of spring is not difficult and the calculus of nominal shear stress is fast also for rectangular section (See Timos…
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About 140 ksi vM stress. But is linear elastic material model. I don't know the mechanical properties od PEEK but I think that is too high. Above all is to high the elongation of the spring under 5 lbf load. The spring become two times long Regards.
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Screen shot
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3 micron of dispacements? Maybe there is something wrong. Try to calculate reaction forces on this way: tools-sum-select Fz and the element set relative to the fixed face on z direction. Take into account that considering the spring as a hollow sect…
