While polyurethane can have a higher elastic modulus than synthetic rubber, the overall properties of PU make it a terrible material for long term use as a car tire. The Shore hardness for PU is much lower than synthetic rubber and will wear badly even in normal use on a vehicle. The structure of the PU material combined with its elastic modulus will cause shear forces to be concentrated near the power delivery side of the tire and will lead to a shear failure where the road contact surface of the tire rips away from the hub side. Not the kind of failure you want in a tire, but this is assuming you are proposing solid PU tires here. If you mean inflatable PU tires, well that's going to be worse.
PU also has a shorter lifetime of usefulness. It will break down with heat, exposure to UV and even oxidize which will make its properties change. They will undergo fundamental changes over time that will turn them into dust and lose their hardness and flexibility entirely. PU is also vulnerable to chemical attacks that include bases, acids and polar solvents. It has excellent resistance to petroleum products, however, conditions vary by exposure time, age and temperature. PU is a good candidate for solid tires on forklifts and the like, especially if used indoors on concrete flooring, but I wouldn't trust it on asphalt or paver roads and definitely not on unpaved road surfaces.
Finally, shaving them down to re-tread them is not a good solution. Not only does this change the circumference of your tires, you will have to resurface all you tires to the same size. You will also have to recalibrate your speed sensor readings or your car will be thrown off for speed measurement and fuel economy. I wouldn't want to be in the first 10 minutes of a rain storm with PU tires that are shaved down. The grip of PU in the road film/oil slick part of the rain will spell disaster for grip and traction.
So...IMHO, polyurethane is a bad idea for tires for road vehicles in general. PU is just too far outside the required material properties for this application. And don't think for a moment that the jews won't fuck with the business of PU tires like they did with synthetic rubber tires. They find their way into everything if there are shekels to be made.
:))) You aliens are getting harder and harder to distinguish from AI. So, are you in the 'Great' or in the 'Outstanding' camp?
BTW, re. plastics for this application: Shore A is applicable. We use these: https://bareiss.de/en/?view=article&id=313:hpe-iii-basic-en&catid=49
No shit fucking @morbo just rolls into the convo and drops chemical engineer level shit on this.
Also Goodyear in the 40’s developed a tire that would last for nearly ever. It likely didn’t have the tech in it as we do today but of course you can’t make money selling a tire that lasted for 100,200,or 500,000 miles silly goy.
No shit fucking @morbo just rolls into the convo and drops chemical engineer level shit on this.
I am an electrical engineer but I switched to software development in 1994 after discovering I liked it more than power generation and transmission. I have worked with all manner of engineers throughout my career and learned a lot from them, including material engineers who worked with engineered resins and polymers. I liked that side of engineering, but I had already switched career paths at that time and didn't want to do it again so soon.
Also Goodyear in the 40’s developed a tire that would last for nearly ever. It likely didn’t have the tech in it as we do today but of course you can’t make money selling a tire that lasted for 100,200,or 500,000 miles silly goy.
While I don't doubt that they did such a thing, as with most stories of such things, we probably aren't seeing the whole picture. The good side is usually all we ever hear about. The bad side, the failures, the unintended consequences and the impact to other vehicular systems are always left out of the story. Good engineering looks at the whole system and my inkling is there were some significant downsides to such a tire that made it impractical in the long run. Add to that the jew angle for continued profits and the idea goes from being an engineering marvel to a economic decision meant to gain shekels. We will never win with jews in the equation, but we won't get rid of them until we hate them enough.
I hate AI with a passion. It makes people stupid, including smart people who just assume other smart people are AI because they say intelligent things. Be proud of the intelligence we have here on Poal that is legitimately human. It's our greatest asset in this war of jew trickery.
You aliens are getting harder and harder to distinguish from AI.
Time to up your skills if this sort of response makes you think AI is involved. This is not rocket surgery here.
So, are you in the 'Great' or in the 'Outstanding' camp?
I choose 'outstanding', but in the sense of it being an outlier idea rather than one of greatness. It's like suggesting making tires out of hardwood.
BTW, re. plastics for this application: Shore A is applicable.
PU Shore A is in the range of 10 to 60 typically. Tires start at 55 and go up from there. Typical pneumatic road tires are in the range of 65 to 70. PU would make for a very soft tire.
Does it matter though? Europeans don't drive anyway.
making tires out of hardwood Change my front left tire, please. Got a flat? No, got termites.
Shore A and D range is 0 to 100. Useful range is right in the middle somewhere, since that's where the best theoretical precision is. Those meters use a three seconds dwell time before sampling because the tip must have opprtunity to penetrate (wink) the sample. After all, it's a measurement of displacement of a flexible sample using a specific tip shape, force and time. Ba-Dum-Tiss.