Carbon fiber life span
01-28-16, 09:12 AM
#102
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01-28-16, 09:26 AM
#104
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Then you haven't been checking here often enough or paying attention to posts. The general consensus is marketing people run cycling companies and make all the decisions.
01-28-16, 09:30 AM
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I'm glad this thread was revived, and by someone making false statements about the safety of bonding CF to aluminum. In the past this was a problem, but that problem has been solved.
01-28-16, 09:37 AM
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Lots of folks firmly believe that old news is the best news.
01-28-16, 09:51 AM
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01-29-16, 05:13 PM
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01-29-16, 11:18 PM
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Composite materials seem to be the choice for all the high end applications in car racing, aircraft and bikes. That isn't to say there are not issues.
On steel...
Many of the old Italian lugged frames were annealed at the joints. Columbus tubing couldn't take the brazing temperature of brass, while the Reynolds 531 could (yes I know the material). This was by design. At the same time many USA frames were silver brazed. So the "spring" thing was not and is not true of all older steel frames. It was based on material and brazing temperature.
On steel...
Many of the old Italian lugged frames were annealed at the joints. Columbus tubing couldn't take the brazing temperature of brass, while the Reynolds 531 could (yes I know the material). This was by design. At the same time many USA frames were silver brazed. So the "spring" thing was not and is not true of all older steel frames. It was based on material and brazing temperature.
01-29-16, 11:21 PM
#113
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You guys can bring your studies, your research your YouTube videos, your facts … No one is fooled.
We all know that carbon Fiber is the Death Material, waiting to kill unsuspecting riders.
Think how many CF frames have been sold over the years … then note how few CF-frame riders are responding.
You know why they aren’t posting here? THEY’RE ALL DEAD, killed by CF asplosion, shredded in a hail of plastic splinters.
The fact that they don’t post here proves it.
And isn’t it strange that we never read obituaries about cyclists killed by CF asplosion? No, it’s not strange at all. Industry agents suppress all that stuff, threatening to withhold advertising funds … or worse.
Don’t be fooled by the CF conspiracy. The lack of fact Is the fact.
CF = Doom.
We all know that carbon Fiber is the Death Material, waiting to kill unsuspecting riders.
Think how many CF frames have been sold over the years … then note how few CF-frame riders are responding.
You know why they aren’t posting here? THEY’RE ALL DEAD, killed by CF asplosion, shredded in a hail of plastic splinters.
The fact that they don’t post here proves it.
And isn’t it strange that we never read obituaries about cyclists killed by CF asplosion? No, it’s not strange at all. Industry agents suppress all that stuff, threatening to withhold advertising funds … or worse.
Don’t be fooled by the CF conspiracy. The lack of fact Is the fact.
CF = Doom.
01-30-16, 06:57 AM
#114
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Composite materials seem to be the choice for all the high end applications in car racing, aircraft and bikes. That isn't to say there are not issues.
On steel...
Many of the old Italian lugged frames were annealed at the joints. Columbus tubing couldn't take the brazing temperature of brass, while the Reynolds 531 could (yes I know the material). This was by design. At the same time many USA frames were silver brazed. So the "spring" thing was not and is not true of all older steel frames. It was based on material and brazing temperature.
On steel...
Many of the old Italian lugged frames were annealed at the joints. Columbus tubing couldn't take the brazing temperature of brass, while the Reynolds 531 could (yes I know the material). This was by design. At the same time many USA frames were silver brazed. So the "spring" thing was not and is not true of all older steel frames. It was based on material and brazing temperature.
01-31-16, 11:09 AM
#115
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This has been discussed since the early 80s. Each tubing material, joint gaps and brazing material, joining temperature lead to a different feel in the frame. They are not springs - at the joints at least. Brass brazing - done in many/most 80s Italian frames was brass with fairly large tube lug gaps. That flows over 1290. USA builders started making tighter tolerance lugs (Henry James) and using Silver based material - Easy Flow 45. It resulted in stronger joints, but not necessarily a better ride.
Here is one article https://www.mwdropbox.com/Dropbox/The...ing_Part_4.pdf
Quote from page 4 middle right.
"A case in point is the Columbus SL lineconnecting the 1300 ° F and 1500 ° F datapoints. The maximum tempering temperaturefor Columbus SL is about 1400°F. So if aspecimen were heat-treated at that temperature for five minutes, there would be a further drop in strength, and an increase inductility, before a reversal of
these trends at1500°F. "
Here is one article https://www.mwdropbox.com/Dropbox/The...ing_Part_4.pdf
Quote from page 4 middle right.
"A case in point is the Columbus SL lineconnecting the 1300 ° F and 1500 ° F datapoints. The maximum tempering temperaturefor Columbus SL is about 1400°F. So if aspecimen were heat-treated at that temperature for five minutes, there would be a further drop in strength, and an increase inductility, before a reversal of
these trends at1500°F. "
Last edited by Doge; 01-31-16 at 11:16 AM.
01-31-16, 12:33 PM
#116
Decrepit Member
Frames Going Soft? | Off The Beaten Path
Structures made of carbon fiber composites, or Carbon Fiber Reinforced Polymer, do in fact fatigue.
CFRP is a matrix of carbon fibers bonded by epoxy (or other polymer) resin. As a CFRP structure flexes over time, individual fibers encased in the hardened polymer separate microscopically from the polymer, reducing the stiffness of the structure. Depending on the specifications of the fibers and polymer resins used, and the engineering of the fiber orientation relative to the direction of stresses and many other variables, the degree to which flexing causes delamination may or may not be a problem for a specific application, but it is an immutable nature of the material (so far).
Carbon-fiber components actually do get softer with use. As the component flexes, the internal fibers break free of the surrounding resin and delaminate invisibly. When TOUR magazine tested carbon forks, they found that after 100,000 test cycles, some forks had lost a significant amount of their stiffness. Today, the European Union standards for fatigue resistance specify how much stiffness a carbon component may lose over the test cycle.
CFRP is a matrix of carbon fibers bonded by epoxy (or other polymer) resin. As a CFRP structure flexes over time, individual fibers encased in the hardened polymer separate microscopically from the polymer, reducing the stiffness of the structure. Depending on the specifications of the fibers and polymer resins used, and the engineering of the fiber orientation relative to the direction of stresses and many other variables, the degree to which flexing causes delamination may or may not be a problem for a specific application, but it is an immutable nature of the material (so far).
01-31-16, 04:12 PM
#117
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Not to really stir the pot but what about all the guys that build their own bikes with cheap Chinese carbon frames? How is it they are riding around on their cheap carbon, dragon, romin injected frames for YEARS without one asplotion?
