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Author Topic: Axle shaft stength comparison  (Read 8893 times)
theking
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« on: September 16, 2010, 08:22:08 PM »

Dana 44
Deflection = twist in degrees before failure
torque in foot pounds
pressure= hydraulic line pressure in the breaking machine



http://pirate4x4.com/forum/showthread.php?t=917868
« Last Edit: September 16, 2010, 08:43:56 PM by theking » Logged

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theking
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« Reply #1 on: September 16, 2010, 08:26:18 PM »

PRODUCT / ................................................. FT.LB. TORQUE/.... % TWIST

Yukon 4340 Dana 60 35 spline short side axle.........12,000 ..................130
Stock Dana 60 35 spline short side axle .................8,300 ....................35
Yukon 4340 Dana 44 30 spline short side axle ..........5,800 ...................35
Stock dana 44 30 spline........................................5,000.....................35
Yukon 4340 Birfield Eliminator kit (ear failure)............5,500......................50
Longfield 4340 30 spline (shaft failure)......................8,500............... ......175
Longfield 4340 27 spline........................................6,500.....................75
Stock Toyota Birfield.......................................... ..4,200 .....................45
Stock Toyota Inner Axle.......................................5,000 .....................45
All Pro "Profield".................................................. 3,500 ....................30

http://www.pirate4x4.com/forum/archive/index.php/t-467075.html
« Last Edit: September 16, 2010, 08:41:42 PM by theking » Logged

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theking
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« Reply #2 on: September 16, 2010, 08:32:12 PM »

Theoretical

Standard Dana axles (1040 steel, induction hardened)
-30 sp 1.31" 6,044.1 ft/lbs
-35 sp 1.50" 8,966.2 ft/lbs.

Moser Engineering (1541m, induction hardened)
-30 Spline - 6,200 ft/ lbs.
-35 spline - 9,600 ft/lbs.

Aftermarket 4340 steel, thru hardened
-30sp 1.31" 9,923.5 ft/lbs
-35 sp 1.5" 14,721 ft/lbs

The Formula is:
Yield Torque (in/lb)= Tensile Strength ( psi) x polar moment of inertia/ radius of material
« Last Edit: September 16, 2010, 08:42:04 PM by theking » Logged

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« Reply #3 on: September 16, 2010, 08:41:43 PM »

so i have no idea what any of that means lol
although the chromo's dont look much stronger than stock for the d44
« Last Edit: September 16, 2010, 08:47:11 PM by penski61 » Logged
theking
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« Reply #4 on: September 16, 2010, 08:47:28 PM »

Pirate will have video up next week showing them breaking the shafts.
 
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theking
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« Reply #5 on: September 16, 2010, 09:39:51 PM »

But, yeah. The data is not very helpful.  It only shows ultimate strength.  Without knowing the yield strength, the shafts may be junk, permanently twisted, long before they break.

     
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« Reply #6 on: September 16, 2010, 10:11:31 PM »

Thanks Kenny,
Those are most of the numbers i was looking for.  cheers
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theking
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« Reply #7 on: September 17, 2010, 12:12:55 AM »

http://www.pirate4x4.com/tv/live12.php

watch the splines twist on the yukon at the end of the Vid!
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« Reply #8 on: September 17, 2010, 12:28:46 AM »

i've heard yota guys discussing the strenght of their stock shafts in the old toys with solid front axles... they speculate that the factory shafts are stronger then the chromos because they are not as rigid, and flex/twist more.
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theking
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« Reply #9 on: September 17, 2010, 01:20:01 AM »

Well, technically all steel will flex the same amount with a given amount of force (young's modulus).
So, it's not stronger because it's more flexible, it's stronger because it is a stronger steel (higher tensile strength).  Steel with a higher tensile strength (4340 vs 15xx) with invariably twist more before it breaks.



  
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« Reply #9 on: September 17, 2010, 01:20:01 AM »

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roastbeef
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« Reply #10 on: September 17, 2010, 02:51:27 AM »

kenny, you make my brain hurt. i don't know what any of that means. the $H!* the rednecks were saying around the campfire about axle strength made more sense.  Huh?
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