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Re: Simulating Car chassis
Hi Chen, it might be good to start with a description of what your analysis is and why you feel the results are strange. Listing your assumptions and expectations would be good too.
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Re: Simulating Car chassis
Hi Jared,
I'm trying to analyze the stress and displacement of the bottom roll cage of the chassis. I performed a static study and applied the following to the study:
Fixtures: fixed all the bottom joints as immovable
Forces: Applied an 80 kg load on the 4 joints of the roll cage
(See attached for image)
However, when I try to mesh and run the simulation the error "Meshing Failed" popped up. I recalculated the joints but the error still pops up, any thoughts on what the issue could be?
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Re: Simulating Car chassis
too general of an issue. might be worth posting hte model and what version and service pack you're using.
best method to troubleshoot is to eliminate some components and then narrow down where the problem is.
if this is happening on all models, check where the models are located. if you ahve them on a dropbox or similar, that can cause meshing to terminate instantly.
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Re: Simulating Car chassis
From what I could see on the image exixte an outline and needs to be closed with the beam.
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Re: Simulating Car chassis
You have 2 unconnected joints where you also apply loads. (2 brown dots).
Look into the geometry and try to figure out why these joints calculates as separated.
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Re: Simulating Car chassis
Perhaps not, but when I moved this bar a small fraction, it meshed fine with connected joints.
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Re: Simulating Car chassis
How do unconnected joints occur? What did you specifically when you moved the bar a small fraction?
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Re: Simulating Car chassis
The 2 brown dots indicate that this crossmember is not attached to the remaining structure.
This happens sometime in SW simulation when using beams and weldment structures.
Sometimes it helps to do the weldments in several steps (in worst case each part separatly).
I'm not sure why it's a problem in your case, but it has something to do with the curvature on the members where this crossmember meet.
I moved the sketch of this crossmember a little bit towards the rear crossmember (where you also have input forces) and then I got it to work.
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Re: Simulating Car chassis
So the help site says there is a Failure Diagnostics tool available for indicating which component failed during the meshing process. It says I right click after the failed mesh and ""Failure Diagnostics" should appear. It does not appear for me, I am using Solidworks 2013 Student edition. Does anyone else have this feature or is it not included in education editions
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Re: Simulating Car chassis
try it on another part with solid mesh. i don't believe this is a mesh failure issue but rather an idealization problem.
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Re: Simulating Car chassis
Not sure if failure diagnostics works on beam elements.
But anyway, as I mentioned before, SW is not always doing what you expect when it comes to beams.
In the attached file you can see what I did to get your file running.
There are 2 problems to solve.
- One beam, on which you add force, is unconnected and will experience rigid body movement.
- Another beam is connected to the wrong joint.
When I sorted these problems out, the simulation ran as expected.
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Re: Simulating Car chassis
some of these things i'd classify as bugs and would recommend reporting to your reseller. but what mikael shows is what we would commonly do to work around them.
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Re: Simulating Car chassis
Thanks for the answer Mikael, it helped me get a simulation running.
Out of curiosity, what could cause the meshing to fail on that bottom beam of the chassis (referring to page 4 of your document)?
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