Quote:
Originally Posted by stevestevesteve
I realize you think this is how carbon fiber works because in a way it makes common sense, but I assure you this is not accurate.
In the aerospace world we are mostly concerned with low velocity impacts and mandate a lot of inspections to monitor all forms of damage. Short of cutting into your roof and pouring brake fluid or power steering fluid into it on a regular basis, you are never going to see a delam issue on your automotive roof from simple rock chips encountered on the road.
The wavy fibers are another matter. In plane kinking can have a pretty significant impact on strength and if these were present in any batch of CF a reasonable person was responsible for, that batch of CF would have been rejected. The impact here on our roofs is insignificant except for the reality that they represent a lack of attention to detail and quality control that is concerning for what else we might not be seeing elsewhere for other things.
Boeing has published a lot of interesting and in depth long term data on their use of CF in the 787 and they had a lot of cause for concern with their 787 dreamliner CF usage, but then they are a shitty company run by accountants and not engineers with aircraft slapped together by disgruntled workers in a race to the bottom in terms of labor costs spread across hundreds of smaller shops all over the country and now world.
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That's great, however, experience with prior BMW CF roofs tells us otherwise. Go jump around in the other model forums on this website, or do some google searches.