This was reproduced from a work forum and is an interesting read
NDT Capability when inspecting Carbon Fiber Bike frames.
Carbon Fiber bike frames are very difficult test and for that reason alone, most reputable manufactures will actually just replace the fame under warranty as long as the original owner has not abused the frame.
Checking if a frame is cracked is not that simple, if the crack is thru the full thickness of the carbon fiber there is a good chance that it will appear on a radiograph. However, if the crack does not go thru the full thickness of the carbon, it may still be cracked, however this may not appear on an x-ray.
Additionally Carbon Fiber is highly susceptible to a phenomena called Barely Visible Impact Damage (BVID). The Carbon Fiber looks fine on the surface, however the structural integrity of the fibers below the surface is less than satisfactory. The amount of damage below the surface varies depending on the type and amount of force of the impact. NDT is able to detect this damage using ultrasonic’s, if they have a suitable standard to compare the frame against. If not detected or repaired this can lead to catastrophic failure. Could get really ugly on a downhill run.
For those of you that do ride carbon frames my suggestion is to handle them with great care. If you have had some sort of impact damage or it appears there is a crack on the surface get it checked. Check you warranty booklet and be familiar with what you can and can’t claim.
On another note, Carbon Fiber is also Hydroscopic (absorbs water), therefore if you get a chip in your paint/gel coat get it fixed ASAP, as this also can have detrimental affects to the strength of your frame. Water absorption can cause a corrosion cell to form on those bikes that are glued together to aluminum lugs, or have aluminum lugs as strengthening members under the carbon fiber. I’ve had 3 TREK OLCV 5500 frames replaced for this reason alone.
Here is the ultimate gadget for all the geeks out there who love to cycle. While the 305 Edge may not be the latest offering from Garmin but it is still a great tool for optimising your training. With the introduction of the 705 Edge the price of these devices has really come down, I’ve found them on GeoManGear for under $US275.
My biggest gripe about the device is the software that is bundled with it. I think it is a fact recognised by Garmin by the fact that it bundles third party software offers in the box. My biggest warning about the “Training Center” software that is supplied with the unit is that it will only load if the device is connected via the USB cable. The problem I have with this, is if the unit ever fails that’s it! You’ve lost access to your data.
It does all the usual things a cycling computer does plus it is a GPS, heart monitor and it has an altimeter. The display panel is fully configurable so you display a ride variety of data and in different sizes to suit in the information you require. This include, speed, cadence, current gradient, current direction, sunrise, time and much more.
Here are some screen dumps from my new toy.
Here is the gradient and elevation with the map, note the blue point on the map represents the point on the graph.
The same graph just expanded
Here is the elevation of Mt Ainslie when I set the lap counter going
Now with speed and heart rate as well
And here is a snapshot of what it looks like in Google earth; each white square represents a data point.
Finally, the all important data
Cool toy huh?