Aluminum Rod material?

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Truckedup
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Re: Aluminum Rod material?

Post by Truckedup » Tue Feb 13, 2018 6:36 am

Many British motorcycles from the 1930's to they all went out of business in the 60-70's used forged aluminum rods, some with a steel cap. I believe it was called Duralumin....After all these years many including me don't trust them ...You measure the rod big end, if it's out of round by about .001" ,the rods are scrap, they cannot be resized. This is the only warning you'll get before the rod fails...
I use R&R aluminum rods in one of the race bikes. The other uses steel rods...
Motorcycle land speed racing... wearing animal hides and clinging to vibrating oily machines propelled by fire

peejay
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Re: Aluminum Rod material?

Post by peejay » Tue Feb 13, 2018 6:46 am

I believe Dural was a 2000 series alloy.

David Redszus
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Re: Aluminum Rod material?

Post by David Redszus » Tue Feb 13, 2018 10:41 am

Given the choice, the rod material of choice would be titanium.
Ti far exceeds Al in every aspect: thermal expansion, thermal coefficient, tensile, elongation,and hot strength.
Al does have an advantage in density, 0.1 to 0.16, but both are far lower than steel.

autogear
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Re: Aluminum Rod material?

Post by autogear » Tue Feb 13, 2018 11:21 am

peejay wrote:
Tue Feb 13, 2018 6:46 am
I believe Dural was a 2000 series alloy.
You are correct. Closest modern alloy would be 2014 or 2024 I believe. Most notably used in Zeppelins (Hindenburg and others) after its invention in the early 1900s

Fireonthemountain
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Re: Aluminum Rod material?

Post by Fireonthemountain » Tue Feb 13, 2018 1:06 pm

In the next few years there probably will be the plastic/graphene rods. Lighter than just plastic rods alone, and graphene is harder than diamonds and 100 times stronger than steel, while being lighter than air, and transferring heat 12 times better than copper. And thats just the tip of that iceberg. :D

Racing68
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Re: Aluminum Rod material?

Post by Racing68 » Tue Feb 13, 2018 1:29 pm

Graphene rods would be nice but if the set costs $75,000 i doubt there would not be many buyers for those.

Morgo
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Re: Aluminum Rod material?

Post by Morgo » Tue Feb 13, 2018 3:55 pm

graphene? just study this page and be dizzy :shock:
https://www.sciencedirect.com/science/a ... 2115002084
"when uncomptent order unwilling to do unnecsessary the probablity of failure is high"

Momus
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Re: Aluminum Rod material?

Post by Momus » Tue Feb 13, 2018 9:58 pm

autogear wrote:
Tue Feb 13, 2018 11:21 am
peejay wrote:
Tue Feb 13, 2018 6:46 am
I believe Dural was a 2000 series alloy.
You are correct. Closest modern alloy would be 2014 or 2024 I believe. Most notably used in Zeppelins (Hindenburg and others) after its invention in the early 1900s
Dural/2024 was the highest strength alloy readily available to the Brit designers. Compared to 7075 at engine operating temperature it has similar uts but significantly less fatigue strength.

SchmidtMotorWorks
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Re: Aluminum Rod material?

Post by SchmidtMotorWorks » Tue Feb 13, 2018 10:23 pm

http://www.schmidtmotorworks.com Aerospace Machine Work: Prototypes, Tooling, Molds.

Momus
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Re: Aluminum Rod material?

Post by Momus » Wed Feb 14, 2018 1:35 am

SchmidtMotorWorks wrote:
Tue Feb 13, 2018 10:23 pm
Read this

https://www.google.com/patents/US6502480
Interesting. No vendors available for that material according to Mat Web. May be another experimental material that is good in compression but severely anistropic and or only produced in 10000 Kg mill quantities at many times the price of 7075.

The patent also expired 3 years ago due to non payment.

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Re: Aluminum Rod material?

Post by Fireonthemountain » Wed Feb 14, 2018 2:50 am

Racing68 wrote:
Tue Feb 13, 2018 1:29 pm
Graphene rods would be nice but if the set costs $75,000 i doubt there would not be many buyers for those.
Graphene is costly when made a little at a time in a lab in a high dollar lab, but it is just the simplest carbon, and is found just about anywhere made from just about any source.Your lead pencil on school was actually graphene, on top of graphene, and so on. Many layers of it is called graphite. Strictly speaking graphene is only one layer thick, but 4 or 5 layers thick can have much of the same properties and that will be easier to produce.

There are already graphene tires, tennis rackets and more. Samsung has a new lithium battery, with a little graphene ball in it that will double or more the batteries life, and probably let it charge in a fraction of what they do now.

https://news.samsung.com/global/samsung ... ging-speed

A graphene plastic rods or crank might actually cost very little, in mass production.

Fireonthemountain
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Re: Aluminum Rod material?

Post by Fireonthemountain » Wed Feb 14, 2018 3:03 am

Morgo wrote:
Tue Feb 13, 2018 3:55 pm
graphene? just study this page and be dizzy :shock:
https://www.sciencedirect.com/science/a ... 2115002084

This is kind of along the same lines, or when they fed graphene to spiders.

https://newatlas.com/bionic-spider-silk-graphene/50908/

Now get this one, graphene riding across nano diamonds has virtually no friction.

Geoff2
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Re: Aluminum Rod material?

Post by Geoff2 » Wed Feb 14, 2018 3:59 am

With the whittling down the weight of modern steel rods, while still maintaining strength, there seems little reason to me to risk using 'Kaboom' alum rods...

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Re: Aluminum Rod material?

Post by Mark O'Neal » Sat Feb 17, 2018 1:22 am

Momus wrote:
Mon Feb 12, 2018 1:28 am
They're almost always made from 7075 T6511. There are stronger grades ie Kaiser's 7068T6511 that are also used in higher $ applications.
Better strength at temp than 7075 though info is hard to come by.
Back when we used to make them we used 7075 and 7076 (for the SuperRods).

Childs and Albert used that "proprietary" material and Bob once told me what it was....but I forgot.

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Re: Aluminum Rod material?

Post by In-Tech » Sat Feb 17, 2018 1:27 am

Mark O'Neal wrote:
Sat Feb 17, 2018 1:22 am
Momus wrote:
Mon Feb 12, 2018 1:28 am
They're almost always made from 7075 T6511. There are stronger grades ie Kaiser's 7068T6511 that are also used in higher $ applications.
Better strength at temp than 7075 though info is hard to come by.
Back when we used to make them we used 7075 and 7076 (for the SuperRods).

Childs and Albert used that "proprietary" material and Bob once told me what it was....but I forgot.
Mark, the brand "SuperRods"? If so, man I sure put those things to the test and they survived well, plenty of stories to tell about how good those rods were. :)
Last edited by In-Tech on Sat Feb 17, 2018 1:30 am, edited 1 time in total.
Heat is energy, energy is horsepower...but you gotta control the heat.
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