Hello
Wear depth analysis question
Block on flat sliding surface analysis using 100mm sliding distance, post processing is giving results on only the first few mm of distance, the rest is outputing 0mm of weardepth.
Its like Prepomax is only reading the first mm correctly then no results.
I am playing around with the time increments, steps etc
I used the two videos tutorials on this subject to setup my study
Thank you in advance for your help
Check the contact results such us CPRESS and other. Wear depth calculation is based on that.
Are you using true scale deformation visualization and switching between subsequent frames ? It would be best if you could share the file or at least some images/videos.
Sorry cant upload more attachments because of my new status
I managed to obtain better results by increasing the Max increments from 100 to 200
CPRESS values are present
Displacement set to true scale
Salve material: Steel
Master material: pom
It seems that contact is not fully established, CPRESS should also show this kind of patchy distribution. Are you constantly pushing the block towards the track like in the tutorial where pressure load is applied to the top surface of the block and held constant in both analysis steps ? https://youtu.be/XnmwjTibThs?si=swN4xCk_6M-qD-_U
Also, it would be better to use a hexahedral mesh.
Getting better, used hexahedral mesh but the results are still patchy..Corrected all BC, now there exactly like in the tutorial,maybe the mesh needs more refinement? Contact interaction changed from Hard to Linear. Also BDM remeshing is set to OFF, Sorry still cant upload study
Now you should be able to share it here. Unless it’s too large, then you can use some hosting website.
Link to study
Thank you again for your input very much appreciated
Thank you that worked out perfectly
I am trying to understand the influence that time and step settings have on the analysis.
Can i find this info in the manual?
If i leave to automatic will Prepomax adjust accordingly?
Also i use the following equation(based on Archard but a little different) W=F*K*S/ H*a
W= wear depth(not volume)
F=force applied
K=Wear coefficient(unitless compares wear rate between similar or dissimilar materials lube/non lubed)
S=Distance travelled
H=Hardness of slave material
a=Surface area of block rubbing on plate
Those are the settings used by CalculiX to control time incrementation. Therefore, they are explained in the CalculiX manual:
- Initial time increment. This value will be modified due to automatic incrementation, unless the parameter DIRECT was specified (default 1.).
- Time period of the step (default 1.).
- Minimum time increment allowed. Only active if DIRECT is not specified. Default is the initial time increment or 1.e-6 times the time period of the step, whichever is smaller.
- Maximum time increment allowed. Only active if DIRECT is not specified. Default is 1.e+30.
In short words, initial time increment is a suggestion for the solver with what time increment size to start (with the automatic incrementation, it will be adjusted during the analysis based on its convergence), minimum time increment is the lower limit and maximum time increment is the upper limit (helpful if you want to ensure low enough increments). There’s also direct incrementation where you enforce increment size but it may fail to converge. Of course, time period of the step is just the total time of the simulated process (although not physical time but just a measure of load incrementation in static analyses without rate dependence).
In my tutorial about wear analyses, I show how to calculate wear depth using custom equation-based field outputs. You could use a different formula in the same way.
