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Author Topic: Air Temp Nitinol  (Read 150688 times)

Offline gadgetmall

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Re: Air Temp Nitinol
« Reply #165 on: March 02, 2017, 01:40:41 AM »
hi gang. I see my Air tempature Nitenol thread is still alive. I haven't given up on my ideas and some of you have obtained the correct Nitenol to train the transition to occur at 72 f  like I have . this air temp is as close to a free energy as is comes for creating work but shaping them into springs. they constantly move pulling string near air did the and windows. I have recently purchased a large amount of Nitenol sheets in rolls. this stuff is thick and creates a tremendous
amount of force . a small one inch by 1/4 will push 2 pounds or more across a table. I have yet to use but a tiny piece of about 5 feet by 6 inch roll of it. have a look

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Re: Air Temp Nitinol
« Reply #165 on: March 02, 2017, 01:40:41 AM »

Offline gadgetmall

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Re: Air Temp Nitinol
« Reply #166 on: March 02, 2017, 01:52:34 AM »
a few more pics of this sheet Nitinol.lots of it . it is a coarse texture and super thick and hard to bend in its normal state and the small piece I play with and annealed simple is  smash able when cold and back to super hard and strong when warm. I see many possibilities for this lot .it could raise windows it's so strong..

Offline ramset

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Re: Air Temp Nitinol
« Reply #167 on: March 02, 2017, 03:38:01 AM »
welcome back to your thread !!

glad to read you are still experimenting here [nitinol] ,and with Sheets now !!
your familiarity and experience will be greatly appreciated .

I'm assembling the  Gwandau wheel below which already uses water ,will be quite easy to adapt a wire frog leg kick drive

 

respectfully
Chet k

Offline sm0ky2

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Re: Air Temp Nitinol
« Reply #168 on: March 02, 2017, 10:12:56 PM »

I beg to differ. It's all the same.


With Respect C'man


Edit:  You do realize that Bi-Metal


A: example :  a simpel temperature Bi-metal ( in for example a gas fired camping cooking stove)  is a bi-metal and does not leave the gas on after its first use. ) iow Memory


B: The word Bi-metal does NOT specify the actual chosen metals


C: It's not rocket science, a metal (or actually any substance) has a certain length (expansion)  at a certain temperature, combine two different metals.. there will be an interaction you can exploit, or trouble you, when experience a delta temp.


Allow me to add some insight


A bi-metal junction operates by the difference in thermal coefficient of expansion.
As per the graph presented, the most extreme case, of the two metals at the far left
and far right of the chart- don't hold a finger to the reactions that take place in Nitinol.
even a bi-metal junction of nickel and titanium does not perform the same.


The reason for this is because the Nitinol alloy is not a simple bi-metal junction.


It is a stoichiometric alloy of equal molar mass of Nickel and Titanium.
Because of their specific mass, there is slightly more Titanium than Nickel.
the main difference compared to a bi-metal junction


is that it is actual 6 different metals involved and there are trillions of "junctions".
take for example- 4 trillion bi-metal thermostat actuators connected in series
with the same temperature difference that you use it for in your home.
but instead of a bi-metal, you have 6 different metals in each junction.


Inside Nitinol (due to the alloying process and training)
are mixtures of Ti , TiO, Tio2, Ni, NiO, and NiO2
as well as trace amounts of TiO3 and NiO3
which give it its' unique properties.


In fact, the Bi-metal chart mentioned earlier was the basis for
the development of Nitinol, when its' extraordinary properties
we're discovered.


At values ranging from 55 tons to 75 tons per square inch
it is distinctly different from bi-metals, which range in the
order of ft-lbs.


Offline sm0ky2

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Re: Air Temp Nitinol
« Reply #169 on: March 03, 2017, 04:06:14 AM »
Further research indicates the range of temperature is higher with
larger % of Titanium.


Also, several patents list a mixture of 55%  Nickel / 45% Titanium
in association with large force vectors quoted at 50+ton/sq in
And close to room temp.


Keep in mind this is a cross-sectional area, irrespective of length.
One sq in would be a section of any length of a 1"X1" square rod.
or a circular rod with a diameter of ~1.128379"


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Re: Air Temp Nitinol
« Reply #169 on: March 03, 2017, 04:06:14 AM »
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Offline sm0ky2

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Re: Air Temp Nitinol
« Reply #170 on: March 03, 2017, 05:20:39 AM »
I was asked to help locate sources for the metal
Here is one I found for suitable wire.
Although I recommend using strips vs springs or wire.
Wire may be applicable if used in multiple strands.
http://m.ebay.com/itm/262827889667?_trksid=p2385738.m2548.l4275&_mwBanner=1


Most sources want us to request a quote.
Possibly due to fluctuations in the market.
The (avg) price should range from $40-60/ kg in bulk.


Word of caution::: do NOT buy from Kellogg Research Labs (KRL)
These guys are out to rip you off, price gouging, and overcharging for the alloy.
It's not often that I bash a company like that, but I feel it is for good reason.
There is no sense in paying what these guys charge, since their prices are
10-100x the $$ from other suppliers.


I will continue to look for viable sources and post what I find here.

Offline sm0ky2

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Re: Air Temp Nitinol
« Reply #171 on: March 03, 2017, 05:44:10 AM »
Here's a descriptive report, worth a good read
http://cimar.mae.ufl.edu/CIMAR/pages/thesis/santiago_jr.pdf
This was submitted as a thesis

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Re: Air Temp Nitinol
« Reply #171 on: March 03, 2017, 05:44:10 AM »
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Offline sm0ky2

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Re: Air Temp Nitinol
« Reply #172 on: March 03, 2017, 09:02:57 AM »
Listed in the references (4 and 5) of the above PDF,
Are procedural methods for 'training' Nitinol (and other SMA's)
In singular memory, dual memory, multiple memory, and R-phase
Transformation states.


Also on pg. 14 is a mostly complete list of SMA alloys.
Particular attention is paid to Ni-Ti-Cu
By adding Cu to the alloy, the stress force is decreased
thus increasing net force output, while lowering difference
in temperature. Accompanied by this is an increase in actuation
speed as well as durability of the actuators. Allowing for longer lifespans
and increased frequency of actuation.

Offline sm0ky2

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Re: Air Temp Nitinol
« Reply #173 on: March 03, 2017, 02:25:24 PM »
Appendix A contains the java code for a Nitinol performance calculator
Shown on page 25.
Different parameters can be entered in, and the characteristics
of the allow are presented by the simulation software.




Offline gadgetmall

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Re: Air Temp Nitinol
« Reply #174 on: March 03, 2017, 04:15:22 PM »
yes I agree with smokey2. do not buy from Kellogg .I did and they do not have air temp notion as they claim to. it is totally a ripoff as the only way 8 was able to get the wire and rods to relax was way below freezing with salt and ice .about 30 degrees f. us less for our experiments because it takes way more energy to.make it do work verses the wire I bought from another source who is out of it. my wire will transition as low as 72 to 76 degrees for it to relax. training and annealing this wire takes practice as the more heat and the longer it's fired the colder it needs to be before it goes in the martesite stage.remember the normal or parent stage which it is rigid is the austenite stage.when you obtain nitinol be sure it's unanealled if at all possible. my sheets are not annealed.it was very expensive as notion is mainly used in the medical industry and military uses.I would be willing to sell some if anyone wants some.other than jmmedical.com and samaterials.com I am the only other place to buy sheet nitinol or muscle foil as its called.i don't know the exact specs of mine but it is thicker than a razor blade and about 10 sheets of copy paper thick.the edges will cut you if not careful.unlike wire or rods this can be stamped punched cut or even possible to be worked down to thinner specs I suppose by hammering and drawing the metal with a press and cold forging.i don't know I haven't tried to hammer any down yet but I intend to try and make it very thin like aluminum foil thickness if possible.i can say it is hard to cut.you need tin snips as it will dull most tools and sizzors .
this magical metal is unlike any other metal and doesn't compartment to bimetals.it is truly a weird alien metal with a life of its own especially when the two stages are close to normal air tempatures.BTW you can obtain thin wire pieces from eBay that will change stages at body tempatures and be soft with close to cool room Temps buy looking for dental thermally activated Orthodontic NITI. you can get a pack of 10 very cheap from china.like 5 or 10 bucks for 20 . it comes in  a lot of sizes diameters and also they have it in rectangular wires as well.
sheet NITI.ill sell my Sheet NITI at 5 dollars per square inch. or 100 dollars for a 5.1/2 inch by 5 1/2 square sheet plus shipping.the sites above list the same sheet for 2999.00.wow they are higher than gold or platnium.

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Re: Air Temp Nitinol
« Reply #174 on: March 03, 2017, 04:15:22 PM »
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Offline Reiyuki

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Re: Air Temp Nitinol
« Reply #175 on: March 03, 2017, 04:29:04 PM »
Nice find Smokey.  Unfortunately it looks like the Java calculator link is dead, so I guess we'll just have to do it by hand  :D

This is the setup I'm going with.  A simple 115degF trained spring and a variable attachable mass.

For temperature control, I'm still deciding whether to just use current to contract the coil, or whether to go with a pump and controlled temperature water-drizzle system.  I'm concerned that simply attaching a thermocouple to the spring could lose a good deal of measurement precision.  Oh well, we'll just have to see.

Offline tak22

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Re: Air Temp Nitinol
« Reply #176 on: March 03, 2017, 08:08:29 PM »
You can learn a lot from these two sources, in particular the first one is a full teaching and learning package (TLP) that introduces the phenomena of superelasticity and the shape memory effect. It has quite good graphics and animations.

https://www.doitpoms.ac.uk/tlplib/superelasticity/shape_memory1.php

http://www-2.unipv.it/compmech/dissertations/zanaboni.pdf

The International Organization on Shape Memory and Superelastic Technologies (SMST) is a volunteer organization made up of industry professionals, scientists and researchers dedicated to disseminating technical education on the unique class of materials which exhibit shape memory and superelastic properties. http://www.asminternational.org/web/smst/home


tak

Offline ramset

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Re: Air Temp Nitinol
« Reply #177 on: March 03, 2017, 09:36:07 PM »
Good stuff indeed !!

setting up a wheel test bed for several experiments [including a floor twist drive off the axle

will be adding much more adjustability and other useful Gizmo's

Smoky has a recommendation for A crankshaft / Nitinol drive ,the pedal Assy will be a good test bed there. [the other half of Bike]

will be good to get the Kids interested in magnets , gravity /balance and nitinol/SMA  drive mechanisms ...especially now that I cut their bike in half  :o

Naahhh only kidding [its mine... :P
will be fun indeed !!


Offline sm0ky2

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Re: Air Temp Nitinol
« Reply #178 on: March 04, 2017, 06:15:57 AM »
Nice find Smokey.  Unfortunately it looks like the Java calculator link is dead, so I guess we'll just have to do it by hand  :D

This is the setup I'm going with.  A simple 115degF trained spring and a variable attachable mass.

For temperature control, I'm still deciding whether to just use current to contract the coil, or whether to go with a pump and controlled temperature water-drizzle system.  I'm concerned that simply attaching a thermocouple to the spring could lose a good deal of measurement precision.  Oh well, we'll just have to see.


Using electricity to actuate the SMA's is abundantly inefficient.
It has niche market value in robotics, but these robots use a lot of energy.
Something to the tune of 12v / 2 A (20-25 Watts)
Where-as raw temperature differences of ~20-40 degrees can do the same thing.


Offline ramset

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Re: Air Temp Nitinol
« Reply #179 on: March 04, 2017, 02:10:38 PM »
will be including experiments with Shape memory Polymers too
and low temperature Phase change gasses or gasse which react to charge on the off balance wheel too  [looking for a link from Dow ?

https://www.youtube.com/watch?v=VQqpnAKf9cM 

to be clear ...all will be to teach the kids the "what ifs" and get them away from The Mind numbing ...hand held mental handcuffs which are making them into Drones...

obviously there will be other threads here as these experiments get sorted

we have amazing resources in this open source community ,and many wonderful experimenters ,engineers and scientists

respectfully
Chet K

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Re: Air Temp Nitinol
« Reply #179 on: March 04, 2017, 02:10:38 PM »

 

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