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Thank you very much once again Victor!!. Nice Job. Let me ask you something, ¿How does the Regular Time Points work for the Nonlinear Solver?. It seems to reset the given values each time I run the analysis. Thanks
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Hi Victor, I do not know if it may help but I have noticed that the thickness expansion in ccx and Mecway is not the same. There is a small difference. (See Pictures) Another curiosity is that the moment leaked to the ground depends on the model …
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Hi, I have taken a look to it and, to me, it seems a problem of the internal solver with pinned supports. Mecway is constraining rotations when it shouldn't. The simplified version of the handrail .liml file attached shows what I'm talking about. …
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Thanks for your comments prop_design and Victor. I’m doing some validation before proceeding with Calculix/Mecway so I’m not completely free to choose the configuration. I have clear now that I will avoid symmetry BC for Laminates or Orthotropic ele…
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Oppps, of course, Cyclic symmetry would show this mess too. I guess it could be solved orienting the properties orthogonal to the axis of symmetry, but I,m working on some examples with laminates at 0º/+45º/-45º/0º and weird combinations. That’s wha…
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Hi, I recently realized that applying symmetry boundary conditions to Orthotropic or Laminated elements couldn’t be safe as it changes the fibers direction, and it is not correct ¿isn't it?. ¿How do we manage this?.
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".....Do you have one especially in mind ?" Mainly the first two. Check the quality of your mesh and if you are experiencing convergence problems , solve the linearized model first (linear elasticity, isotropic material..) Try to understand how t…
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".... I would be happy to have a tool to assess qualitatively the effect of some parameters as battens stiffness, luff curves modification and so on, on the sail shape under load (FSI)" Woow.. . If you get this your sail will be the creme of the …
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This webpage could also be helpful to predict your Mast performance and to see in which category it lies. I would use it to calibrate/validate my profile. Try to reproduce fabricator IMCS. FEA model can give you all the numbers to compute IMCS. Not…
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Hi JMF11, Hard problem and not too much information on the net. I have never built or design a Sail, that is the first to say and I assume it can be a very deep subject as it involves FSI. I have found you asking a similar question on other forums …
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Hi, @MikeMcMullen . You are right. This would not capture reflections or shadowed areas unless the surface under traction is carefully assigned. Just direct blast impact and open structures where the pressure could freely develop. The attached fi…
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Thank you guys, I’m happy it’s being interesting and useful. This is the triangular load: A*unittriangle(C,(B*t-0.)-x) C Parameter to control the width in the step version of the load is now the first term into the unittriagle function. Don’t kn…
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Good morning Mariotte , I have managed to solve two of the initial difficulties before facing again the application of the Method proposed by the EN code. ( Perfect-Plasticity and Yield Criterion) 1-Perfect Plasticity can be set up in MECWAY by me…
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You can save and share your .liml file with the results directly in MECWAY free version as viewer. As far as they don't run the model, the results could be explored. I have tested on my old laptop where the licence is not installed anymore, and it w…
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Validation File with B32 element. Nonlinear Dynamic 3D. Computation time 5 min.
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Hello Lorenzo, “to have accurate stress results, at least three well-formed element in the thickness must be, so an initial max element length should be thickness/3” To check if your mesh fulfils this recommendation , you can use the Cutting Plane…
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Good morning, Victor,DaveStupple I guess Mr. GEORGIADIS will not mind if I post some extracts of his work. It is >20 years old paper. There are three integrals. -Over the whole volume when we add element by element . (see formula 4.8) -Over ea…
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It is better shown in the following equation 4.9. The overall Risk of Rupture in a model is a summatory of individual contributions of the Ne elements. Each of this individual contribution is a common function evaluated at each element (blue) and we…
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This paper is very good: PROBABILITY OF FAILURE MODELS IN FINITE ELEMENT ANALYSIS OF BRITTLE MATERIALS CONSTANTINOS GEORGIADIS Computers & Structures Vol. 18, No. 3, pp. 537-549, 1984. (Computer subroutines outlined) It describes the backgrou…
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Today dichtstoff at the ccx forum provided a solution to remove Displacement BC. *BOUNDARY, OP=NEW
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Hello Mariotte, That seems very ambitious!!. . Good for you. My goal some months ago was to introduce myself to the method and validate some of the examples, but unfortunately, I found some drawbacks that made me stop. First one , Linear-elastic…
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Hello PaulFlynn I think I see your problem. I faced it when I did the whole sequence. When transferring temperatures from solution to a Thermal transient study , the temperatures go to a "New Node Temperature BC" and it doesn't have the option "wit…
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Thanks’ Victor and ConelisP, I will follow the code in detail. Seems to me it opens a whole set of new options. I think I could remove Displacement BC too by deleting the constrained elements once they do what I need. Thank you very much again. N…
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Thank you very much in advance CornelisP. I will open a new Post as it could be a useful procedure to someone else. I will call it "MODEL CHANGE- CONTACT PAIR, REMOVE/ADD"
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Hello Lorenzo, This happens when there are large models with very small details on it like the half coupling and its internal lip.See image. Read suggestions carefully. point 3) “avoid small radius, chamfers or holes that will not affect the ove…
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Thanks for your comments JohnM. I reproduced those two video tutorials some days ago. My post is the direct application of the first one with “real world numbers” to check its performance. The reason for displacement functions is that if you find…
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Form-finding-Sail shape. [JMF] Perimetral steel it's being crucial to keep some initial tension and make it converge. Wrinkles may develop at the lower edges too. Runs in about 5 min with Pastix. ccx 2.19 is required. Thanks for your inspiring e…
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@cwharpe It works. Great !! So we have a generalized method for any load function in any direction and it can be used with the internal solver and all its beam sections. Really Nice. Thank. Regarding direction cosines, once you discover quaterni…
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I have reproduced a study case from ANSYS forum to help me better understand how contact works. Seems ANSYS can automatically adjust Contact Stiffness to reach a desired Contact Clearance. I have done it manually to be <than 10-6. All the detail…
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HI StefanH, The problem could be solved using some algebra but once applied it is difficult to make it work because line pressure as a function of position is not a follower or doesn’t work to me on Beams. If you want to try modelling with solids o…
