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!