Carbon Frame Reliability

On Sunday, July 7, 2019 at 8:45:10 AM UTC-7, Tom Kunich wrote:
On Saturday, July 6, 2019 at 7:00:37 PM UTC-7, Sir Ridesalot wrote:
On Saturday, July 6, 2019 at 9:47:32 PM UTC-4, Frank Krygowski wrote:
On 7/6/2019 9:18 PM, John B. wrote:

We might ask Frank whether he ever suggest that his engineering
students got their data from youtube. Or perhaps what his reaction
would have been if anyone had submitted a paper with a footnote saying
that "the values above were obtained from watching youtube".

One project I assigned annually was to research a variety of mechanical
and thermal properties of many different materials - various metal
alloys, a selection of plastics, a couple species of wood, etc.

No, YouTube would not have qualified as a source.

--
- Frank Krygowski

Another web source that is not usually accepted by professors is Wikipedia. It's astounding how many people read Wikipedia and watch You Tube and then pass themselves off as experts - sometimes even on You Tube.

Cheers

There are problems that people who have never been real-life engineers do not understand. That is that some materials, most especially resin based materials are extremely easy to not manufacture properly. Voids and sharp edges in areas that cannot be seen can lead to failures that Frank's "numbers" are completely unaware of.

When someone on YouTube has bisected a carbon handlebar and shows large areas of voids on the most expensive American made components that might give you reasons to think rather differently about the difference between engineering numbers and actual end product.

You don't need to be an engineer to question your story about disposable CF frames. The numbers don't add up. A factory would have to produce a staggering amount of product to outfit a pro-team for a single season. Each rider has maybe four to six bikes (road/TT/climbing and spares), and if you threw those out after every race or even stage race, that would over a hundred a year -- for every rider. The factory would go broke just supporting a pro-team. And now bicycle sponsors are paying money rather than just providing product, so that factory would be knocking out hundreds of bikes and paying some huge amount of money to sponsor the team. No Italian CF frame manufacturer that also makes one-off steel frames for your friends could do it. And if so, what is the name of the factory? We could easily fact check.

-- Jay Beattie.