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Victor
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Sorry for the frustrating experience. Ever increasing stress there is normal behavior and with that fine mesh, you probably have good results elsewhere. It's at a sharp re-entrant corner which is a stress singularity so it's theoretically infinite. …
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Most of what Mecway does runs in only one thread so it will only use a fraction of the CPU resources on typical CPU. Two main exceptions are the matrix solving stage of the internal solver which should use multiple cores, and the CCX solver if you o…
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I didn't notice the title, sorry. No, Mecway doesn't support lines in STEP files. It supports some types of lines in DXF, as you can see, but not all of them, which might be why it's not showing up. Your file might use POLYLINE which is not supporte…
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The files might be using features that aren't supported. Try some of the STEP files in the Samples folder and the DXF attached here which should all appear.
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It isn't a special feature - just apply the load that causes the prestress as well as the other loads with the Nonlinear Static 3D analysis type. To show the difference between prestress on and off, you can suppress/unsuppress that load, or define i…
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If you made the 2D section with Automesh 2D, you can add a local refinement in there which is located at a specified node number. If it's from a flat STEP or IGES file, that's a bit easier. Right click a node and choose New local refinement which m…
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At mesh convergence, the node and element stresses will be the same. Any difference is error in one or both. Usually, the node stresses are more accurate because they're a smoothed version of the element stresses, which eliminates discontinuities th…
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It depends what you want. If you're trying to find the maximum stress anywhere simply by using FEA, then you'll need to model the joints with their details like weld fillets, fasteners, and internal corner radius on angle sections since those detail…
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It looks like CCX crashed. I think that can happen with a too big model but also for other reasons. You might need to reduce the number of nodes or at least eliminate parts to identify what causes the failure.
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Being only 15 values and new to Mecway, it might be easiest to make the mesh by hand and enter all those values by clicking nodes. However, if you're going to do this multiple times, you could make the mesh definition in the spreadsheet and export a…
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Ever increasing stress with refinement indicates an infinite stress concentration. For stress at the connections between shell elements, you could use a solid mesh with the correct details of the geometry and radii, or some other technique like a co…
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Separate surfaces is a problem that happens with IGES files. It's better to use STEP format instead. To set the element axes so U is the radial direction, make another element orientation in Loads & Constraints with these values: X: x Y: 0 Z: z
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Sorry about that. Please see this post for workarounds and how to dismiss it. http://mecway.com/forum/discussion/632/error-e072348-pops-up-and-won-t-go-away
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Nothing I know of. You might have to iterate by hand adjusting the stiffness then solving again.
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Here's an example bending an initially straight strip through 90 degrees. It uses time-dependent pressure acting as a force couple but you could also do it using time-dependent displacement. It needs to be a non-linear analysis to capture the large…
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I think it's because the surface there is faceted with flat 6 element wide facets, rather than being curved. There are sometimes also cases where shells have these kinds of alternating stresses and you may have to ignore those localized regions or …
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You can use the modal vibration analysis type with stress stiffening (under Loads & Constraints). You apply whatever loads it has (gravity) and it'll include their effect on the stiffness of the structure. If the "bottom" (furthest from the sta…
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Those are components of the direction vector which will then be projected onto the element's surface to form the direction of the U axis. So if the cone's axis is Y, then set the U axis to: X: 0 Y: 1 Z: 0
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You can't change the elements in Add element. For concentric rings or solid shells, you could either: * Build them up from a spherical core using Mesh tools -> Extrude * Mesh tools -> Revolve a straight line of line3 elements into a circl…
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Hello Matt For a library, you can use File -> Import to combine a 2nd model with one that's already open. For a solid with multiple thin layers, it'll probably be best to have compatible meshes on adjacent layers so they can form a single mesh …
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Mecway doesn't have different global coordinate systems, but many features can be defined using functions of position which allows you to achieve the same effect. If you mean the element coordinate systems, you can set them all parallel to the cone…
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It's sort of a bug when Show thickness it turned on because the thick shell faces can subtly cover the points where the nodes are. Disla. Thanks for the request. That adds to somebody else who asked for it before.
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1. CCX can use tri3 elements for shells, but don't because they're not very accurate. Use tri6 instead (Quadratic elements in Meshing parameters). 2. The warning is normal for nonlinear analysis without the quasi-static option turned on. The error …
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The U axis is defined like that, yes. If you make the element using New element then it's directed from the 1st node to the 2nd. The other axes only have a fixed default orientation until you specify a new one.
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Sure. The node connectivity (changed with Invert) defines the U axis while "orientation" defines the other two axes. An easy way to make them all point out is with Loads & Constraints -> New element orientation like the attached picture.
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The common "dumb" way to solve rigid body motion is to put weak springs on the free part. Use a line2 spring element fully constrained at its other end. Then in the solution, check the reaction forces on the spring's constraints to ensure they're ve…
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Select some elements, then click Mesh tools -> Invert. It might be hard to see the axis lines but the red ones (U) are reversed. One of the others will be too to retain the right handed coordinate system.
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Good to know turning on contact works! You're right that stick slope doesn't matter with TIED. Just put anything there to satisfy CCX. Sorry, stick slope does matter. That's what determines its stiffness in the sliding directions and should be as …
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I don't think being too low should have that effect if there's nothing else wrong with the model - it should cause the linkages to spread further apart and intersect the pin. Any rigid body degrees of freedom that are only constrained by contact, o…
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If the deformation scale factor is >>1, they might be rotating, which looks like radial expansion when it's exaggerated. In that case, you might need to attach them to something or constrain them to prevent rigid body rotation.
