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Victor
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Comments
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On second thought, please don't publish a user.config from Mecway on the internet because if you're a paid customer, it contains your product key which is private. Perhaps send this through email instead.
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I would think any dynamic analysis could be used as inertia relief, even if it's inefficient on computer resources. Either use a single time step or have damping so the final state is a rigid body acceleration with deformation from the loads. Note…
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Sorry about the late reply. The oscillation is because the initial condition is the undeformed state, so it falls down under gravity, then bounces back and oscillates. Mecway doesn't currently allow non-zero initial conditions so you might have to u…
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1. Yes except with the Tsai-Wu criterion instead of von Mises.2. Yes 3. Yes except it only checks the top and bottom of each layer, not anywhere in between.
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Not quite a tutorial, but here's a quick example of the Tsai-Wu failure criterion: Make a model with shell elements and a laminate material. Enter the parameters in Material Properties ->Failure criteria -> Tsai-Wu Solve and see the result…
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That's a very nice tutorial but I think it's too dated to be much use for Mecway. It doesn't seem to have examples of the different-materials-on-each-layer type of laminate material which is the only one that Mecway and LISA have now. There's an…
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Self weight isn't automatic so yes, you have to specify -9.81m/s^2 gravity.
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It looks like SAP's two formulas might be equivalent (I haven't checked) and the latter is the one it actually uses but the former, with the integral, is more intuitive as a definition.
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Not directly but two ways around it: if you have base excitation of a rigid base, then you can use a fixed base with gravity load on the whole structure as acceleration. You can copy and paste tables of time-acceleration data into that. You coul…
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I'll look into adding the membrane forces. For out-of-plane shear forces, LISA's results often had quite large errors so I removed them from Mecway. I'm not sure what was wrong with them. The attachments show the kind of errors to expect. The plat…
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Please attach the user.config. Maybe it's not correct.
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Just curious what makes this problem challenging. Is it hard for solvers to converge? Or something complicated about the boundary conditions or the load changes while it's deforming?
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It depends on your goal. If you want to find the stress in or right next to the weld, ideally model the plates and the bead itself using solid elements in a single mesh. You can also use bonded contact to join the weld bead onto the plates but it …
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After you use a unit in a model, it should remember what you prefer for other values with the same quantity. You can also create a starting model that has a dummy material with the units you want. Then if you build a new model off that, new material…
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No, you shouldn't need both. The thickness in the material properties is for shell elements and is ignored for solid elements. There, you would define thickness only by the geometry (node positions).
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Yes, the animation briefly stopping when you move the mouse over the graphics area is normal. It's also a bug and I'll try to fix it for the next version. Thanks for pointing it out.
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It doesn't currently keep the node selections because any shell or beam elements will cause them to be renumbered when they're expanded in the solution and that's a little harder to keep track of. You should be able to work around it by making an el…
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Mecway doesn't have a tool to fill in holes with mesh. If you just select the nodes on the edges, then the Merge nearby nodes tool will only affect those nodes.
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Mecway doesn't have a way to define node coordinate systems other than defining *TRANSFORM by hand. Is your aim to get a plot of the radial component of displacement instead of the X,Y,Z components? This sounds like something that would best be done…
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You can highlight free edges with Tools -> Labs -> Find non-manifold shells. If the Labs menu isn't visible, turn it on through Tools -> Options -> General -> Labs. I'd like to make this into a proper feature eventually. JRP, can I …
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Keep in mind that since it's so slender, there will be stress stiffening effects here, like a catenary. So a linear calculation won't be accurate. Instead: Change the analysis type to Nonlinear Static 3D Change the solver to CCX Unsuppress the …
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Another way should be to make each tube a separate part without the hole and join them with bonded contact. Make the edge "faces" of the end of one tube the slave and the surface of the other tube the master.
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Yes, it's just because it's a rarely used feature that's not implemented yet. You can still enter *EQUATION cards under CCX -> Custom model definition.
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I've addressed this privately now but for anyone else with the same problem - no graphics appear at any point - only Windows controls: Start -> Run -> dxdiag Click the Display1/Display2/etc tabs and make sure "Direct3D Acceleration:" says "…
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Yes. You can define normal pressure as a function of (x,y,z,t) in Mecway versions 4,5, and 6 using a formula as shown in this picture, but only with the internal solver and not for CCX.
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That's a good question. I don't think it's really a buckling mode. It appears to be the solution of the static solve that CCX does first. I'll need to look into whether this should be suppressed from the solution. Perhaps you could say the very firs…
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Dave: I converted each unit to its base units such asW/m^3 = kg/(s^3.m) then replaced m with μm, getting kg/(s^3.μm) = MW/m^3 Sergio: I think the file doesn't open because it has thousands of individual node loads that Mecway is blindly tryin…
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I'm not quite sure what you mean about linking the center of gravity. Mecway doesn't have remote mass or force loads though. You would need to either: A) Put forces directly on the face. The net force plus coupled forces for the moment caused by t…
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Here's a simple cantilever beam sandwich panel. Skin thickness = 0.2 mm Overall thickness = 10 mm Bending moment per unit length at the support = force per unit length * beam length = 20 N/m * 1 m = 20 N.m/m Mecway solution: Moment per…
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I don't quite know how to scale all the quantities properly they way you did but the way I would do it is to choose a coherent unit system like μm,kg,s,K and use that for all quantities but tell Mecway that it's m,kg,s,K. If I've done my maths right…
