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#32
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Fatigue Life of Aluminum
On 24/07/2017 02:52, jbeattie wrote:
On Sunday, July 23, 2017 at 6:45:12 PM UTC-7, jbeattie wrote: The fatigue life of aluminum is Damn, posted prematurely. But the answer is 12 years. My previous one, a Trek, only lasted about five years before the right chainstay snapped going over a pothole in the City. As total bike failures go it was quite anticlimactic, just a severely rubbing back wheel. |
#33
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Fatigue Life of Aluminum
On Tuesday, July 25, 2017 at 3:22:16 PM UTC-7, Nick wrote:
On 24/07/2017 02:52, jbeattie wrote: On Sunday, July 23, 2017 at 6:45:12 PM UTC-7, jbeattie wrote: The fatigue life of aluminum is Damn, posted prematurely. But the answer is 12 years. My previous one, a Trek, only lasted about five years before the right chainstay snapped going over a pothole in the City. As total bike failures go it was quite anticlimactic, just a severely rubbing back wheel. Mine just made clicking noises which basically blended in with all the other creaks, groans and clicking noises. If the chainstay failed, the seatstays would have held, and like your bike, the upshot probably would have been more noise and some braking. No epic disaster. Cannondale is pretty good with warranty replacement. We'll see how generous they are this time. My last replacement attempt was a pre-CAAD straight gauge 6061 frame that died after 20+ years. I took it in for warranty replacement, and the local rep. told me I just wore it out. I had two early CAADs that cracked at the 5 year mark or thereabouts. They had those ridiculous cantilever stays/dropouts that were prone to failure, and they were replaced. The last replacement was a CAAD 9.That is a great bike -- now residing with my son Utah. -- Jay Beattie. -- Jay Beattie. |
#34
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Fatigue Life of Aluminum
On Tuesday, July 25, 2017 at 3:22:16 PM UTC-7, Nick wrote:
On 24/07/2017 02:52, jbeattie wrote: On Sunday, July 23, 2017 at 6:45:12 PM UTC-7, jbeattie wrote: The fatigue life of aluminum is Damn, posted prematurely. But the answer is 12 years. My previous one, a Trek, only lasted about five years before the right chainstay snapped going over a pothole in the City. As total bike failures go it was quite anticlimactic, just a severely rubbing back wheel. This is the beauty of metal over carbon fiber. Metal generally fails at the weakest points which are things like the bottom of the fork legs and the the stays. Steel doesn't suffer fatigue limits for anything under 75% of maximum strength though AL has a linear fatigue line. Carbon fiber is much stronger than AL per lb. but they are building them lighter and lighter and they too have the same linear fatigue line and can fail much sooner since their maximum strength is less with reduced material. Plus you cannot tell manufacturing errors as easily though I understand that a lot of the inspections now use 100% ultrasound inspection. That still relies upon the inspector paying 100% attention to his work. I do believe that they can build a fairly light CF frame and fork that has an almost unlimited lifetime but I also know that they do not. |
#35
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Fatigue Life of Aluminum
On 7/23/2017 6:52 PM, jbeattie wrote:
On Sunday, July 23, 2017 at 6:45:12 PM UTC-7, jbeattie wrote: The fatigue life of aluminum is Damn, posted prematurely. But the answer is 12 years. My Cannondale CX qua commuter bike bit the dust. I was doing my occasional maintenance -- which was extensive because the BB, RD and FD had gone to sh**. The pulleys had shark's teeth, and the FD cage had practically worn through. The BB was shot, and the bike was creaking like crazy, including a snapping sound that made be a bit nervous -- and for good reason. The left side chain stay had practically cracked all the way around. Waaah. Bike two down (Supersix in roof rack incident). I'm down to one bike -- the Roobay. Time to go on a buying spree for a fast commuter. -- Jay Beattie. 12 years is pretty good for a heavily used aluminum bicycle. They last a lot longer when they are rarely used! The chainstay cracking is the usual failure, the main tubes don't often crack. |
#36
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Fatigue Life of Aluminum
commuter ? Sports bike ?
We lost our energy expert. I doahn have time fir that. What's the 12 year energy expenditure fir steel vs AL ? Is there an immediate negative post commute physical effect for steel vs AL riding by a lawyer ? Prob not. The AL feels faster. I'm steel over 10 years. The bike will be here when the sun sets. 12 years on a bone rattling beer can is impressive. Junk. The thought of it is repellant. What now ? |
#37
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Fatigue Life of Aluminum
On Wednesday, July 26, 2017 at 7:07:15 PM UTC-7, sms wrote:
12 years is pretty good for a heavily used aluminum bicycle. They last a lot longer when they are rarely used! The chainstay cracking is the usual failure, the main tubes don't often crack. I had every model in the Colnago Dream series and they all had been heavily used when I got them. They were in perfect mechanical shape. And I put thousands of miles on them myself. So as I said before - most AL bikes are overbuilt since the metal is so light that there is little penalty for doing so. |
#38
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Fatigue Life of Aluminum
On Thursday, July 27, 2017 at 9:35:34 AM UTC-4, wrote:
On Wednesday, July 26, 2017 at 7:07:15 PM UTC-7, sms wrote: 12 years is pretty good for a heavily used aluminum bicycle. They last a lot longer when they are rarely used! The chainstay cracking is the usual failure, the main tubes don't often crack. I had every model in the Colnago Dream series and they all had been heavily used when I got them. They were in perfect mechanical shape. And I put thousands of miles on them myself. So as I said before - most AL bikes are overbuilt since the metal is so light that there is little penalty for doing so. all the Cols C buys are in perfect mechanical shape |
#39
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Fatigue Life of Aluminum
On Monday, July 24, 2017 at 8:12:51 PM UTC-7, John B. Slocomb wrote:
On Mon, 24 Jul 2017 09:25:38 -0700 (PDT), Doug Landau On Monday, July 24, 2017 at 6:09:28 AM UTC-7, AMuzi wrote: On 7/24/2017 4:49 AM, wrote: Al cookware is highly suspect for causing Alzheimers Like the 'phillpis curve' and other fantasies of the 1970s, that was roundly debunked years ago. what are some others? Try googling it. What about the guy who live in the main woods for 30 yrs w/o seeing anyone? |
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