You trade-off reliability of the result using these tricks like mass scaling. Some tip on sanity check: Check that the kinetic energy (EKE) does not exceed 5-10% of Internal energy (EI) when using mass scaling. Then make sure the work done in propelling mass added in mass scaling (ALLMW) is much lesser than Kinetic energy (ALLKE). Usually, EKE, EVD, EFD should also be much lesser than EI. Finally, if you have to simulate the same model many times, you can check the result with and without using any scaling etc.
@canerguven37873 жыл бұрын
Great video , Thank you
@ozangunduz39636 ай бұрын
Very helpful and good explained video! Thank you!
@flymanhawaii2 жыл бұрын
Super useful video! Thank you!
@hnrwagner3 жыл бұрын
Great video, also fantastic thumbnail. I tried it for my explicit problem and the reduced calculation time is significant. However, my load displacement curve oscillates extreme, does it mean I cannot use the density scaling?
@10Minuters3 жыл бұрын
Thanks Dr. Ronald for much encouragement. With high density scaling, inertia force starts to dominate. Same is true for artificially increasing the loading rate. Trying Mass calling only in the set of bad/ small elements can reduce the effect. But if you have to use lot of small elements, try a conservative density scaling instead. I believe using small damping in solution step can also help. Share with us if you find a 'sweet' combination.
@yunsongguo5842 жыл бұрын
You made my day!
@bibinjose25273 жыл бұрын
Nice content and explanation. While adding mass scaling to an explicit problem what are the possible changes in the result?? Whether it will be proportional to actual result or not??
@10Minuters3 жыл бұрын
Hi, You trade-off reliability of the result using these tricks like mass scaling. Example of some problem can be: The deformation of bodies can be totally unrealistic if high mass scaling is used. You can see high inertia effect i.e. large deformation where force is applied but small deformation in other part of the model. Stress and reaction forces can be too large. Your requested plots like stress, force etc. can give shaky curves. Simulation might abort. etc.
@syakiraliff3 жыл бұрын
can you do a tutorial for a simple coating experience fretting wear
@Faveryan3 жыл бұрын
Could you also provide us more detail to adjust the mesh for unnecessary portion of the model gradually bigger? Thanks
@10Minuters3 жыл бұрын
Hi, here is a video in our channel that might help : kzfaq.info/get/bejne/h7pypbeirLHToIk.html
@noamaanshaikh57025 ай бұрын
Hello Sir, I am using shell element S4R type for a composite material, and in the verify mesh section, I cannot select or highlight the elements that might be potentially poor so that I can create a set and assign mass scaling to only those elements. The error message I get is: 'stable time increment could not be calculated for any element in the selected regions. No section assigned...'
@pradeeppadala5820 Жыл бұрын
Sir, I am working on the explicit dynamic problem( milling operation) in Abaqus. I defined the interaction as General contact (Tangential -> penalty, Normal -> Hard contact) Master surface (Rigid) - shell element (tool) and slave surface - Node set of workpiece, but I was stuck with this error. "ErrElemExcessDistortion - STEP 1". Can you tell me what could be the mistake?
@user-hr2re2rk3p3 жыл бұрын
@play time 4:04 / is delta t 7.7e-7??? is it 9.747e-7?
@10Minuters3 жыл бұрын
Thank you for pointing it. It was my mistake.
@noamaanshaikh57025 ай бұрын
How do I calculate Cd if I have a composite material? There are different values to be defined for anisotropic material in the Elastic section in the material property
@sirajudheench81822 ай бұрын
3:52 calculation mistake and units. density must be tonn/mm3, E should be in N/mm2 and Le in mm.
@10Minuters2 ай бұрын
I used SI unit system for this example.
@akashawasthi3132 Жыл бұрын
Sir.. how we can define flux limit ratio by defining stable time increment.?
@alameen.mohamamer83763 жыл бұрын
it is a great video, but I have questions, how to calculate Le for complex geometric model?
@10Minuters3 жыл бұрын
Hi, each element might have a different Le. Mostly, you don't have a constant Le for the whole model.