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Rudezuk 09-12-2002, 01:13 PM What is stronger and by how much.... 1.5" DOM vs 1 1/4" ID sched 80 pipe (1 5/8 od) The price difference between the two are huge! chadl 09-12-2002, 01:42 PM What wall thickness on the DOM? Rudezuk 09-12-2002, 01:59 PM Originally posted by chadl What wall thickness on the DOM? .250 wall.....That kind of help huh:D Moab Austin 09-12-2002, 02:53 PM Originally posted by RudeZuk .250 wall.....That kind of help huh:D DOH! now tell us what you are using it for? for holding presurized gas then the pipe is stronger... about anything else the dom will be way stronger... in any case I'd use wood - way easier to widdle Keith 09-12-2002, 03:15 PM Austin, you have been widdlin' your wood way to often lately:flipoff2: DemoMike 09-12-2002, 03:50 PM Pipe, ASTM A-53 Grade A 48ksi ultimate/30ksi yield Pipe, ASTM A-53 Grade B 60ksi ultimate/35ksi yield 1020 DOM Tube 80ksi ultimate/70ksi yield Or did you mean to ask which one would have greater resistance to bending, cause thats a different animal... I = 0.049(OD**4 - ID**4) elf_cruiser 09-12-2002, 04:09 PM I = 0.049(OD**4 - ID**4) Please elaborate on this formula, how does this compare a resistance to bending btwn two different alloys?? Also, I have posted in another thread, I am trying to decide what to use for suspension links. I would like to use .25wall 2" OD 4140 chromo seamless, OR .500 wall, 2.5"OD A500 DOM. I would prefer the 4140 cause it will be much lighter, but I am not sure it will be of equal strength. These will be bent links for clearance, so I will not be landing on them hard, but I will be appliying a lot of load at the bends. I will place webbing around the bends for reinforcement. What do you think, demomike? DemoMike 09-12-2002, 04:29 PM Originally posted by elf_cruiser Please elaborate on this formula, how does this compare a resistance to bending btwn two different alloys?? Also, I have posted in another thread, I am trying to decide what to use for suspension links. I would like to use .25wall 2" OD 4140 chromo seamless, OR .500 wall, 2.5"OD A500 DOM. I would prefer the 4140 cause it will be much lighter, but I am not sure it will be of equal strength. These will be bent links for clearance, so I will not be landing on them hard, but I will be appliying a lot of load at the bends. I will place webbing around the bends for reinforcement. What do you think, demomike? I = 0.049(OD4 - ID4 ) for round sections All grades of steel have virtually the same modulus of elasticity, 30x106, so the alloy isn't really a factor. For a given cross section, shit steel will be as rigid as high alloy steel. But, the good steel will bend farther before taking a set and/or failing completely. I = 0.536 for 2" od x 1.5" id vs I = 1.666 for 2.5" od x 1.5" id , 3x as rigid (regardless of alloy) Fueler 09-12-2002, 04:41 PM i know i could search but, im a lazy fawker. and since your talking about it...whats the main diff between schd. 40 and schd 80 pipe? Dan-H 09-12-2002, 05:06 PM Originally posted by elf_cruiser I am trying to decide what to use for suspension links. I would like to use .25wall 2" OD 4140 chromo seamless intesting comments on 4140 vs 4130. http://www.eaa1000.av.org/technicl/4130.htm here is another page that helped me understand some of the terms used since I don't know squat about heat treating and even less about proper welding. http://www.indstl.com/heattrt.htm ( and yes, I am bored :rolleyes: ) anthony_harris 09-12-2002, 05:11 PM Originally posted by screwedUp i know i could search but, im a lazy fawker. and since your talking about it...whats the main diff between schd. 40 and schd 80 pipe? Wall thickness, Schd 80 is thicker. Rudezuk 09-12-2002, 06:44 PM Originally posted by DemoMike I = 0.049(OD**4 - ID**4) so in bending terms the sched 80 1 1/4 ID 1.660 OD is stronger or less resistant to bend DemoMike 09-13-2002, 10:47 AM One more time... I = 0.199 for 1.5 x 0.25 wall (1.5 od x 1.0 id) I = 0.241 for 1 1/4 SCH 80 (1.66 od x 1.278 id) (more resistant to bending) 1 1/4 SCH 80 will deflect less for a given load. I would stay away from saying its "stronger". Thinks in terms of geometry, not material strength. Again, For a given cross section, shit steel will be as rigid as high alloy steel. But, the good steel will bend farther before taking a set and/or failing completely. For suspension components in particular, I personally would try to use DOM as a minimum, but I know others here have (and will) argue otherwise. Dan-H, thanks for the links.:D I was gonna say something about the 4140, now I don't have to. | |