I am currently working with a small team to make a carbon fiber rear bonnet. I have watched the Easy Composites Vacuum Infusion Carbon Fiber Hood video countless times and learned a lot from it.

However, the bonnet we are attempting to fabricate must have a failure line as can be seen in the image below.


So that in the event of a crash, the bonnet will bend/fracture in half along the failure line.

For the time being, we will be conducting a failure test on just the top half (i.e. the part of the bonnet that is visible from outside the vehicle) of the bonnet we will make. The question is how would it be best to incorporate such a failure line? As of now, we intend to make the top half of the bonnet from (200gsm Carbon) / (1 layer of Lantor Soric XF2) / (200gsm Carbon). The plan we have in mind is to remove a 15mm strip of soric along that line leaving just 2 layers of 200gsm Carbon. Would that be a sufficient method to achieve the failure line, or would that result in a structure that is too fragile along the failure line. Any suggestions would be immensely appreciated!

It appears the image was not attached correctly. Here is a link to the image showing the failure line (The red line) location we want to achieve:
https://flic.kr/p/24wjFos

Why do you need such a failure line? I can't really think of a reason this would improve safety. such a pure carbon failure line might snap in a crash, but leaving half a bonnet flying through the air, wich can't be your goal. the soric core improves the splintering characteristics over a pure carbon structure. and a soric core with just a single layer carbon on either side will imply less forces on the crash object than a regular steel bonnet any way.

however, 2 layers of 200g carbon will be extremely flexy without a curved surface. so if this is the bonnet you are planning to do, this will likely make a wobbly bonnet. additionally you will see the corner of the soric core through the top layer, resulting in two lines across the bonnet.

If you really want crash safety, I would recommend getting some lightweight Kevlar, an add it below the surface layer, above the soric. cut it a few cm smaller than the bonnet, because Kevlar really doesn't leave nice post cure cutting edges.
if you want to stick to your plan, reduce the soric thickness in the failure zone. for example from 3mm to 2mm. this will leave enough stiffness, but will create a weak line.

As oekmont said, there isn't terribly much point in incorporating this design feature. It is a fail safe for a metal structure, designed to direct crash energy to specific areas. By changing to a carbon structure, you are totally changing the way the car would dissipate energy in a crash anyway, and so it won't behave in the same way the metal version was designed to do. 

Thank you oekmont and Hanaldo for your advice and input. I am aware that incorporating a failure line into the bonnet is completely unnecessary. However, we are currently involved in a competition sponsored by some major automotive manufacturers and the judges are requiring us to follow the standards they have for a metal front bonnet. We have tried very hard to argue that there is no point in incorporating a failure line, particularly since we are making a rear bonnet, but to no avail. It is what it is unfortunately. Regardless, I thank you very much for your insight!