Hello everyone,
I am trying to understand why carbon fiber components in BMW 7 series and many other cars are used in conjunction with Steel? Why are carbon fiber stand-alone components not used instead of these hybrids? Are there any intrinsic problems with stand-alone carbon fiber components? 

A f1 tub and a nose are grey specific in their design that they have to pass 1 set of rules in a very specific crash test and the squeeze tests.
Lots of " cheats" that go on
8.1 Ali core used for example in the squeeze area.
You could never make a hole tub with it but easy to put in your test points
Your nose,the very front is cosmetic as it will be destroyed in a nano second so people don't bother doing a structural build to the tip
Not unknown for wing fixing inserts to be missed out in a crash box.
In a crash test solid carbon or Ali inserts can plod through core like a snow plod
You have to crash within the deceleration curve so if you took a cross section of a nose you would see varying thickness laminate.
The same with core and differing densitys