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scottr99
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Thank you Sergio for the tip. I did have Code Aster for a little while. It's difficult to get any help for that code, however. Luckily I get to use Explicit STR from Ansys at my workplace. I work for Husqvarna btw. If one can afford it, I definit…
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Hi Sergio, the horizontal-directed initial velocity is just so they can demonstrate the bouncing along the base, so it's not a simple free-fall drop test. Whenever I analyze drop tests, my part is modelled already touching the base (at the beginni…
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By the way I can't view the 3 vid's you posted.
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I got this running, but had to make an additional modification, see highlighted text in image. Strangely, my VM stress at node 122 is different from yours, having the greatest value on the first bump, but much less in magnitude overall.
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Ah ok.. cool Sergio! Yeah there's no way the stress is more on the last hit. There's some issues there for sure but at least it's something to work with and get started. I probably won't get back to it tonight but I'll make progress in the coming da…
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Sergio, have you got that to run? I'm having issues with it. Also, is there a way to prevent Mecway from including any "Analysis" data from showing up in the CCX input file? This way I could run CCX examples with minimal modification. As it is no…
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Minus an Explicit analysis tool for personal use, and because I can easily do a nonlinear body on another body with an acceleration (nonlinear 3D), I am searching for an equivalent acceleration to match the strains from a drop impact. I came across …
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Impact looks interesting but hasn't been updated in a few years. Also I'm unsure if it could handle a large model. CCX Velocity looks promising in a dynamic analysis.
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Hi Victor, that makes complete sense, thank you. What I'm actually trying to accomplish is a drop test of a plastic part. I typically use explicit analyses for this but looked and evidently the plasticity is not included with explicit yet. So it wi…
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Haha Sergio I just found that myself. Just do the following prior to the above card.. *FREQUENCY, STORAGE = YES num modes
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In Ansys the natural frequencies are calculated automaticly in/for a Harmonic Response analysis so there's no need to perform both. I just did a search to see if Calculix does it the same way but I can't find anything either way. So yeah you may hav…
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Isn't just *STEADY STATE DYNAMICS, HARMONIC = YES Low f, Upr f, num data pts, bias Google "steady state dynamics calculix".
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I saw that manual, good stuff!!
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Well I had to use the cutting plane which was painful because I couldn't see what I was doing as I was doing it, if that makes sense. I had to do a step then check, repeat. I think if we could hide a selected set of elements on the fly, they could b…
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I like how you made the bolt mesh, I'll definitely be using that idea. But if there's a lot of bolts that could be cumbersome I think. Also, it would be nice if we could hide a selected set of elements. I had to use the cutting plane to see/pick th…
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Sergio, x direction is not radial as far as I know. It's x in cartesian. And if your longitudinal axis is y, then you should only have "0.,1.,0." under *Pre-tension. If you had "1.,0.,0." then it was pulling it transversely. Is that what you meant?
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youtu.be/aiXtaw__98U
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vid below..
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Hi Sergio, I was able to get *PRE-TENSION working. The difficult part was getting my geometry/mesh to have faces -- or a surface of mesh faces -- normal to the longitudinal axis. Once I get more familiar with these tools perhaps it will get easier…
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I think to make the pre-tension card work you'd have to have a portion of shaft of the bolt be a separate volume but sharing a face with its adjacent volumes. This way you end up with a SURFACE normal to the bolt/force direction, as one of the two c…
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Sergio, thank you! So you use the *ELASTIC & *PLASTIC cards and enter the true stress-strain curve for these thermoplastics too? Victor, thank you! I was successful with what the manual showed on page 126-127, however, I didn't see the PEEQ sh…
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Thanks Sergio and Victor! I'll see if I can get a hold of someone from CCX about why the don't output eq. pl. strn. That's disappointing because R-O is my preferred way to represent my nonlinear material data and equivalent plastic strain is invalu…
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Also, I noticed that Eq. Plastic Strain will show up for BISO and BIKN, but not for R-O.
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Sergio would you mind sharing your plastic clip example analysis file? I'd love to dig into the details of that analysis!!
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Hi Sergio, I agree about FreeCad! I also have experience with NX and Catia. I'm very surprised how Onshape, existing in a cloud, can be so powerful! Great recommendation!
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Thank you Victor!
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Also, Gravity load does work. I'm using Mecway 5.0 in 64-bit, and either ccx29.exe, or ccx28p2.exe. Seems the issue is coming from Mecway since it's not able to create the input file with the centrifugal load information.
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Hi, thank you for the responses. I took your advice Sergio and opened an account with Onshape! It seems very capable, thanks very much for this!
