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Stress analysis beams vs solids

Question asked by Marian Micik on Apr 19, 2016
Latest reply on Aug 30, 2016 by Mike Pogue

Hi everyone,

I'm trying to calculate the maximum load capacity of two trolleys. See attached pics of the frames. Since I'm new to SW I first googled some articles and watched video tutorials on youtube but nothing helped me much so far. I can calculate a simple part. But I'm helpless when it comes to assemblies. I think the problem is that I don't understand how the simulation works. Every time I solve an error or a problem, I get a new one.
These two frames are differently designed. One is made of structural members and the other one is made of solids.

 

1. My first question is. Beams or solids? When is it better to use solids and when beams?

- If I'm correct it doesn't really matter. If I make everything right, I should get the same results. Somehow I managed to calculate one of the frames. But then I realized it's made of solids. So I changed it to beams to see what will happen and I got different results. I came across this topic where the guy had a similar problem. But it didn't really helped me to solve my problem.

Like I said. I can calculate one part, but with assemblies it's much more difficult. With one part I still get different results but the difference is small.

 

2. Can I use both solids and beams in one simulation?

Example: I have trouble to fix the beams. I don't want to fix it in the joints. I want to fix it on the bottom. Like it's laying on the ground. Maybe stupid idea but I want to make it a little more simple (and avoid troubleshooting messages). So I make the lower parts as solids and everything else will be beams. Can I do that???

 

3. It seems that it is easier to use beams because when I use solids, I get a lot of "meshing failed" errors. And if I mesh the failed parts again the calculation times are too big.

 

4. When I apply force on solids I can pick between "total" or "per item"  load. As you can see on the pic Frame1.png I need to calculate the maximum load of each beam and the max. load of all 3 of them in each row. How do I do that? Do I use the option "per unit lenght" or how do I do that?

 

I know it's a lot of questions but I'm working on it for several days now and I kinda didn't move forward. And even if I do get a result, I'm not sure if I can rely on it.
If you think it's too much to explain atleast share some links to some tutorials.

 

Thanks in advance.

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