tag:blogger.com,1999:blog-2523357558654725888.post4253208148776430991..comments2024-01-05T11:00:30.673-06:00Comments on DFW Point-to-Point: Damage to CompositesSteve Ahttp://www.blogger.com/profile/13650405341304401203noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-2523357558654725888.post-8463262334270327052010-03-27T02:24:34.139-05:002010-03-27T02:24:34.139-05:00Don't reckon that you will have seen the women...Don't reckon that you will have seen the women's scratch final in the World Championships (26th March, session 5), notable for a spectacular wipeout. A rider up the banking touched wheels, came off and slid down through the peleton. One bike split in half.Hamhttps://www.blogger.com/profile/17182921009517833997noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-35284804676553524512010-03-22T14:21:11.172-05:002010-03-22T14:21:11.172-05:00I continue to thoroughly enjoy these pieces on car...I continue to thoroughly enjoy these pieces on carbon... well done Steve.RANTWICKhttps://www.blogger.com/profile/15394479078513545568noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-14968690396630936302010-03-21T11:48:59.865-05:002010-03-21T11:48:59.865-05:00Twister. Yup!Twister. Yup!Steve Ahttps://www.blogger.com/profile/13650405341304401203noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-16215531541402625552010-03-21T10:32:20.548-05:002010-03-21T10:32:20.548-05:00You are an engineer, aren't you?You are an engineer, aren't you?twisterhttps://www.blogger.com/profile/02593091250403547793noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-31869380513648793612010-03-20T09:59:17.268-05:002010-03-20T09:59:17.268-05:00Ham, if it makes you feel any better, go to this l...Ham, if it makes you feel any better, go to this link and you can see a LeMond seatstay. The part that ought to make you feel better is it GOT FIXED!<br /><br />http://www.bustedcarbon.com/2010/01/broken-lemond-seatstay.htmlSteve Ahttps://www.blogger.com/profile/13650405341304401203noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-74378736173170195622010-03-20T09:27:52.951-05:002010-03-20T09:27:52.951-05:00Kcab in the mid 60's I wuz a principal in a qu...Kcab in the mid 60's I wuz a principal in a quite dubious adventure called " Chuck Davis, Custom Surboards"<br /><br />We used a UV stabilized polyester resin and I rather expect that today's epoxy resins are similarily formulated when a clear weave finish is desired<br /><br />Often there can be "gaps" twixt composite design/inspiration/prototype and after execution (production) that can "surprise"<br /><br />The Burrows (I think) designed Hotta frame/fork is a good example<br /> <br />Chuck Davis<br />TulsaChuck Davishttps://www.blogger.com/profile/18135578486955751337noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-63154019146935403182010-03-20T08:44:01.441-05:002010-03-20T08:44:01.441-05:00(gulp) My carbon bike is LeMond/Bontrager/Trek. Lo...(gulp) My carbon bike is LeMond/Bontrager/Trek. Logic says it shouldn't worry me just because the two pics of fork failure are both Trek but since when were humans any good at risk assessment?Hamhttps://www.blogger.com/profile/17182921009517833997noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-39787073809333191162010-03-19T22:06:30.137-05:002010-03-19T22:06:30.137-05:00If you think of carbon as really fancy fiberglass ...If you think of carbon as really fancy fiberglass or marine plywood, you won't go too far wrong.Steve Ahttps://www.blogger.com/profile/13650405341304401203noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-32434364037599609382010-03-19T21:47:09.047-05:002010-03-19T21:47:09.047-05:00I would suspect the failure occurred as a result o...I would suspect the failure occurred as a result of a possibly unnoticed impact (during shipping, in the garage, or in use). The braking put the trailing edge of the fork in more compression than usual. Couple that with a pothole and the trailing edge of the weakened fork can cripple, causing the front of the fork to immediately fail in tension thereafter. Unfortunately, the picture angles do not allow a direct impact to be ruled out, and the failure progression through the laminate isn't visible in the photos.<br /><br />There is a similar failure of a fork, at http://cozybeehive.blogspot.com/2008/12/bontrager-carbon-fiber-fork-failure.html <br /><br />I do not agree with all of their analysis, however, particularly the "cancer and fatigue" stuff.<br /><br />I would advise the guy to see what Trek will do for him, preferably starting with an examination via an independent lab. If he wishes to pursue it, a good ultrasonic and radiographic inspection might shed added light on the situation. In particular, if the laminate was porous, that is an indication of a manufacturing defect since porosity can't really be caused by the user.Steve Ahttps://www.blogger.com/profile/13650405341304401203noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-2586124738282808042010-03-19T21:30:46.372-05:002010-03-19T21:30:46.372-05:00Good informative post. You make it clear. I unders...Good informative post. You make it clear. I understand composites but I didn't know that carbon was just another one. Not that it will ever be IN my life.Oldfoolhttps://www.blogger.com/profile/14688289425207257034noreply@blogger.comtag:blogger.com,1999:blog-2523357558654725888.post-84112687567658030502010-03-19T21:24:25.424-05:002010-03-19T21:24:25.424-05:00Fork damage.<a href="http://www.bikeforums.net/showthread.php?629648-Catastrophic-fork-failure-25mph" rel="nofollow">Fork damage</a>.Doohickiehttps://www.blogger.com/profile/06088639153697449691noreply@blogger.com