How to simulate this car chassis ? please help

[PlatinumZealot]

No. He didn't say your question is silly... He said that his question might be seen as a silly one.

[firasf1dream]

No. He didn't say your question is silly... He said that his question might be seen as a silly one.

ah ok but it is not
so is my setup right ? :/

[PlatinumZealot]

It should look like this when done..

Notice that the stress is asymmetrical.

http://www.toyota-motorsport.com/en/ser ... ulation-en


I still feel you are missing a torsional loading across the bulkhead. Torsional rigidity always a big goal in chassis design. It also adds to the principal stresses.

[firasf1dream]

It should look like this when done..

Notice that the stress is asymmetrical.

http://www.toyota-motorsport.com/en/ser ... ulation-en
http://www.toyota-motorsport.com/slides ... ation2.jpg

I still feel you are missing a torsional loading across the bulkhead. Torsional rigidity always a big goal in chassis design. It also adds to the principal stresses.

this is the case where you have a driver inside i think in the picture
but what i want to know is where to places the fixtures and how to place the forces ?!

about the torsional yes i read about it but not easy to do it in my case, and what i did is that i applied a torsional moment on the points of the attachments of the wishbones and fixed the back of the cockpit

[mrluke]

Silly question.

Under a steering condition, is it correct to put the reaction forces at the points where the wishbones enter the chassis? I would have thought the forces would travel through the spring / damper mounts with the wishbones acting as pivot points. This would clearly be different for braking.

why is it a silly question if i never ever made a study for a single seater car or any car and i am trying to learn !!?!

Sorry, I was highlighting my post as a potentially silly question.

[krisfx]

I tried (stupidly) simulating a composite component using the carbon fibre material in Solidworks while at university, it didn't seem at all accurate

why ? i got realistic values which has a very similar behavior in reality

How can you quantify realistic values? If you had a chassis, then you could feasibly say your values were realistic/behaviourally accurate. I had no way of quantifying other than against hand calculations, which is where the first problem lies. Solidworks' simulation tools are good, but they aren't 100% accurate from my experience.

Edit: AFAIK my Solidworks treat every material as isotropic, which has a big impact on results, though this was a couple of years ago now, so things may be different.

[firasf1dream]

I tried (stupidly) simulating a composite component using the carbon fibre material in Solidworks while at university, it didn't seem at all accurate

why ? i got realistic values which has a very similar behavior in reality

How can you quantify realistic values? If you had a chassis, then you could feasibly say your values were realistic/behaviourally accurate. I had no way of quantifying other than against hand calculations, which is where the first problem lies. Solidworks' simulation tools are good, but they aren't 100% accurate from my experience.

Edit: AFAIK my Solidworks treat every material as isotropic, which has a big impact on results, though this was a couple of years ago now, so things may be different.

well i don't know about the years before but now you can do orthotropic or others