|
|
Thread Tools | Display Modes |
#21
|
|||
|
|||
Fatigue Life of Aluminum
On Mon, 24 Jul 2017 09:25:38 -0700 (PDT), Doug Landau
wrote: 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. I get 40,400 replies in mere seconds. -- Cheers, John B. |
Ads |
#22
|
|||
|
|||
Fatigue Life of Aluminum
On Mon, 24 Jul 2017 11:52:43 -0700, Joerg
wrote: On 2017-07-24 09:25, Doug Landau wrote: 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? The man-made ice age, for example. I still remember that us kids got quite scared about that. No it's become man-made global warming. Oh wait, no, the last iteration is global change. Wot nonsense. I don't think there is any doubt that the earth is getting warmer. The arguments seem to be whether it is a normal temperature swing and what, if anything, is causing it. -- Cheers, John B. |
#23
|
|||
|
|||
Fatigue Life of Aluminum
On Mon, 24 Jul 2017 13:18:19 +0000 (UTC), David Scheidt
wrote: John B. Slocomb wrote: :On Sun, 23 Jul 2017 18:45:08 -0700 (PDT), jbeattie wrote: :The fatigue life of aluminum is :In 1965 or 6 I worked on DC-3's built in the 1930's. My mother had Some of those DC-3s are still working. There's someone who put turbo props on them, even. They're not pressurized, so they dont' suffer from pressure cycles, and they structure is such that every part can be replaced, without too much other changes. Yes, there are a surprising number in "daily" use and yes they are pretty easy to fix. But then so are most aluminum airplanes. -- Cheers, John B. |
#24
|
|||
|
|||
Fatigue Life of Aluminum
On Mon, 24 Jul 2017 18:46:21 -0700 (PDT), Doug Landau
wrote: The fatigue life of aluminum is In 1965 or 6 I worked on DC-3's built in the 1930's. My mother had aluminum cooking pots that she bought in ~1930 and lasted until her death in 1992. Is this scene accurate? https://www.youtube.com/watch?v=SQRGuX_a5Fg No it isn't. although the results are pretty much what will happen if a "gun ship" were to fire on a crowd. The mini guns on a C-47 gun ship, which the video does picture, were initially fixed a fairly shallow angle and in about 1966, or so the angle was increased so they the aircraft didn't need to bank so steeply, but in any case the aircraft would be banked and circling the target when they fired. In an actual attack all three of the guns would probably have been fired. Accuracy was sufficient that when we tested the new higher angled mounting we dropped an empty 5 gal drum in the bay, from about 500 ft, and circled around and made a 1 second firing pass. There was a sort of explosion of spray and when the spray settled there was nothing there. Seems to be a composite film made of actual gun ship flights https://www.youtube.com/watch?v=uKOrpyO0z48 -- Cheers, John B. |
#25
|
|||
|
|||
Fatigue Life of Aluminum
On Tue, 25 Jul 2017 11:13:24 +0700, John B. Slocomb
wrote: On Mon, 24 Jul 2017 18:46:21 -0700 (PDT), Doug Landau wrote: The fatigue life of aluminum is In 1965 or 6 I worked on DC-3's built in the 1930's. My mother had aluminum cooking pots that she bought in ~1930 and lasted until her death in 1992. Is this scene accurate? https://www.youtube.com/watch?v=SQRGuX_a5Fg No it isn't. although the results are pretty much what will happen if a "gun ship" were to fire on a crowd. The mini guns on a C-47 gun ship, which the video does picture, were initially fixed a fairly shallow angle and in about 1966, or so the angle was increased so they the aircraft didn't need to bank so steeply, but in any case the aircraft would be banked and circling the target when they fired. In an actual attack all three of the guns would probably have been fired. Accuracy was sufficient that when we tested the new higher angled mounting we dropped an empty 5 gal drum in the bay, from about 500 ft, and circled around and made a 1 second firing pass. There was a sort of explosion of spray and when the spray settled there was nothing there. correction, that should have read 55 gallon barrel Seems to be a composite film made of actual gun ship flights https://www.youtube.com/watch?v=uKOrpyO0z48 -- Cheers, John B. |
#26
|
|||
|
|||
Fatigue Life of Aluminum
On 7/24/2017 10:12 PM, John B. Slocomb wrote:
On Mon, 24 Jul 2017 09:25:38 -0700 (PDT), Doug Landau wrote: 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. I get 40,400 replies in mere seconds. -- Cheers, John B. 'peak oil', laetrile -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#27
|
|||
|
|||
Fatigue Life of Aluminum
On 7/25/2017 9:00 AM, AMuzi wrote:
On 7/24/2017 10:12 PM, John B. Slocomb wrote: On Mon, 24 Jul 2017 09:25:38 -0700 (PDT), Doug Landau wrote: 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. I get 40,400 replies in mere seconds. -- Cheers, John B. 'peak oil', laetrile Trickle down economics. "We will be greeted as liberators." Oops. Not ancient enough, sorry. -- - Frank Krygowski |
#29
|
|||
|
|||
Fatigue Life of Aluminum
On Tuesday, July 25, 2017 at 7:20:30 AM UTC-7, Joerg wrote:
On 2017-07-24 18:18, wrote: On Monday, July 24, 2017 at 12:00:37 PM UTC-7, Joerg wrote: On 2017-07-24 06:18, David Scheidt wrote: John B. Slocomb wrote: :On Sun, 23 Jul 2017 18:45:08 -0700 (PDT), jbeattie wrote: :The fatigue life of aluminum is :In 1965 or 6 I worked on DC-3's built in the 1930's. My mother had Some of those DC-3s are still working. There's someone who put turbo props on them, even. They're not pressurized, so they dont' suffer from pressure cycles, and they structure is such that every part can be replaced, without too much other changes. The Goon still flies passengers: https://www.youtube.com/watch?v=OJBpwXSz_io You can absolutely guarantee that every piece of aluminum on that aircraft has been replaced. I doubt it. I have also seen some south of here that looked really old and flew regular routes. On this one they didn't even invest much in modern avionics: https://www.youtube.com/watch?v=3QSv3Gs4FHU In the hanger I've watched them replacing sections of aluminum paneling on the wings because of cracking around the rivets. They didn't treat it as anything unusual and were quite professional in drilling out the old rivets, walking off with the panel and then showing up again later with a new panel and riveting it back in place. DC-3's and 4's were real work horses. You didn't see anyone using the larger prop planes. |
#30
|
|||
|
|||
Fatigue Life of Aluminum
On 2017-07-25 07:31, wrote:
On Tuesday, July 25, 2017 at 7:20:30 AM UTC-7, Joerg wrote: On 2017-07-24 18:18, wrote: On Monday, July 24, 2017 at 12:00:37 PM UTC-7, Joerg wrote: On 2017-07-24 06:18, David Scheidt wrote: John B. Slocomb wrote: :On Sun, 23 Jul 2017 18:45:08 -0700 (PDT), jbeattie wrote: :The fatigue life of aluminum is :In 1965 or 6 I worked on DC-3's built in the 1930's. My mother had Some of those DC-3s are still working. There's someone who put turbo props on them, even. They're not pressurized, so they dont' suffer from pressure cycles, and they structure is such that every part can be replaced, without too much other changes. The Goon still flies passengers: https://www.youtube.com/watch?v=OJBpwXSz_io You can absolutely guarantee that every piece of aluminum on that aircraft has been replaced. I doubt it. I have also seen some south of here that looked really old and flew regular routes. On this one they didn't even invest much in modern avionics: https://www.youtube.com/watch?v=3QSv3Gs4FHU In the hanger I've watched them replacing sections of aluminum paneling on the wings because of cracking around the rivets. They didn't treat it as anything unusual and were quite professional in drilling out the old rivets, walking off with the panel and then showing up again later with a new panel and riveting it back in place. Sure, wing paneling in high stress area will have to be replaced once in a while just like we need new rims on our bicycles at times. But not every piece of aluminum on the aircraft. Look at the cockpit in the video where it seems nothing of the aluminum there ever got replaced. They probably have to don rain coats when the weather is bad. DC-3's and 4's were real work horses. You didn't see anyone using the larger prop planes. Up north they still fly the others commercially, too: https://www.youtube.com/watch?v=3RUIjlfdy4s https://www.youtube.com/watch?v=yE2eQJGBcjU https://www.youtube.com/watch?v=kvWpAVYdEeI Getting back to bicycles I am amazed what the aluminum on my MTB takes. It is my first aluminum bike and I was initially skeptical. This bike often has to go through nasty turf while loaded to the gills (it's modded in back for that). Then there are the rock hits at higher speeds. When they hit my shins it hurts a lot and often blood flows. When they hit the down tube there is a loud *KANG* and sometimes I think "Well, that one must have made a dent". And when I stop and look it didn't, just scratches. -- Regards, Joerg http://www.analogconsultants.com/ |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Anodizing effect on fatigue life of aluminum alloy | Peter Cole[_2_] | Techniques | 100 | May 6th 08 04:50 AM |
Uh oh, Aluminum frame fatigue question | dgk | General | 24 | February 26th 07 07:53 PM |
Interesting article on aerospace aluminum fatigue | Peter Cole | Techniques | 14 | November 3rd 06 07:36 PM |
alloy road bar fatigue life...carbon replacement? | dookie | Techniques | 9 | May 6th 06 02:35 PM |
Aluminum Frame Life Expectancy | GRL | General | 1 | July 16th 03 09:39 AM |