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Thanks Victor, “Without load reversal”. That's the point. I'm doing some reads to see why is this happening. What it is also strange is why the compressive load&release end up on a different value of plastic strain than the one under tensile/…
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I keep doing test to see what could be wrong and I have found that the solver seems is not taking Poisson's Ratio under consideration. I have redone the calculation again with Poisson's Ratio=0 and display show the solid is shrinking under tension a…
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Hi, After some sleep and coffee here are my results. I hope I can express myself better. I think that Plastic Strain at the end of the Load/Release process should be the same and also Compression / Tension should behave equally, and they do not. I h…
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Hi Victor , I have just found my source of error. I have been comparing Principal Strain 1 against Principal Stress 1 for the whole set of models. For some reason, under compression , the principal Stress 1 is not representing the same direction a…
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Thanks, John, for your fast response and link. I think that isotropic and kinematic show their nature and differences when we apply cyclic loading or at least tension followed by compression or vice versa. In my case I'm just applying a load and re…
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Hello, I have done a comparison between the different Plastic models available in MECWAY/ccx before going to more complicated geometrical models. Isotropic hardening & Kinematic Hardening introducing the exact same values for the True Stress-Tr…
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Hello nwedding, In addition, an optional true stress – true strain curve for use in elastic-plastic finite element analysis can be wholly derived according to ASME_VIII_DIV_2 ANNEX_3D.3 Stress-Strain. There is an Example in the PTB-5-2013 4.6. Inp…
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Hi Manuel, Mecway also has a very useful tool called "Open Cracks" under the view tree. It helps a lot to find nodes/elements that are disconnected.
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Hi Dave, Regarding the disc positioning remember there is a nice phyton script done by John "Python script to create center node of circle between 3 points." Regarding the integration of both geometries maybe it is easier for the mesher if you p…
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@Johan_S First of all I have to say in no way I’m criticizing or questioning your model. Your model is impressive !! My knowledge about this particular problem comes from traditional calculation of tanks under seismic actions. Any particular code…
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There could be a workaround directly applying the hydrostatic pressure loads using the Heaviside function to exclude the empty side of the container. I have separated each load on internal and external surface to be able to check if they are correct…
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I have found that my previous posts are only valid in particular cases which would not solve your more general problem. As far as I can see introducing two gravity loads do not manage them as independently. Hydrostatic pressure is distributed as if …
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i7 4700MQ @ 2.4GHz RAM: 16.00GB DDR3-1600 Bolt Assembly Test.zip -1st run time March 2020 (CalculiX 2.16 PARDISO) : 5 Min 17 Sec -Actual run time October 2021 (CalculiX 2.18 PASTIX) : 1 Min 2 sec Thank you very much to all the people who has wo…
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Wow, thanks. That’s much more than expected. I'm working on this example too and will tell you If I find an explanation for Pl+Pb+Q mostly and not Pl+Pb.
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Good afternoon, Sergio, It's been a long time since this post but I would kindly ask you if you remember and want to share it how did you manage to solve the axisymmetric problem and extract stress linearization at the same time. It is only availab…
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Thanks Victor, Nice and clever alternative. It works with density as thickness.
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Thanks prop_design and cwharpe, I have also receive response from the Calculix forum. "above example are for truss element, so it does not required mesh to be refined. only use one element mesh betwen each joint of connected members. Spliting and …
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Thanks Victor,
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Edited. I have also posted in the ccx forum as it clearly seems a ccx issue.
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Thank you 3rav. Another question. ¿Do you know if PROCESSORS in CCX_NPROC_STIFFNESS and NUMBER_OF_PROCESSORS refers to Logical Processors or Cores? Thanks
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Hi, I'm completely puzzled regarding the windows variables I have to use to set/optimize the Pc/ccx performance. I have : CCX_NPROC_STIFFNESS NUMBER_OF_PROCESSORS OMP_NUM_THREADS My processor is an intel i7 4700MQ which according to Intel has: …
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I have a similar performance than prop_design with CCX_PARDISO.exe but I think it is using all cores not just one. The point is that seems to be limited in the utilization% of each core. That limitation disappears with Pastix that goes full capacity.
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Hi Bailey, ¿Is this a plane strain academic exercise? ¿Retaining wall of 30.5m maybe?. Seems very thick. I'm sure many people on this forum would be pleased to help you including me but ¿could you explain with some more detail what is going on in …
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Hi Sergio, The Strain Energy density can help you to locate the more interesting areas For an isotropic material the strain energy density function is directly and uniquely related with the principal stretches.
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Hi McNick, Now I get why you talk about "similar instability" . Looking at the base node where the heat transfer rate is higher I can see the oscillations. Looking at the period between them, it is clearly related with the time step which in my op…
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Hi McNick, Your model has element sizes of 500um width. According to the formula your mesh wouldn't be able to capture the cooling process correctly. Maybe it is the origin of the instability you mention. L<sqrt(k*t/(rho*Cp)) PET Mesh Size…
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Hi, Ccx and Mecway expands shell elements to solids creating new nodes. Regarding the node selection or removal, you could activate the coordinates check button and postprocess filtering by coordinates and then sorting by Y coordinate. ¿Which "…
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¿Is there a way to replace the geometry rather than reload it? This is probably not in the Best practice books but, when the model is not heavy, I put the different geometries all into the same file. This way: They can share the material defini…
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Hi McNick, One way to make your liml file lighter is to clear the result before sending. Right click on top of the solution in the tree menu and select clear. Regarding your model issues I would start with a 2D section of the zone of interest (hea…
