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chilehed

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Everything posted by chilehed

  1. chilehed

    Alloy

    Interesting, but confusing as well. The press release says "Tests show that under applied stress normally large enough to produce a change in shape, the alloy undergoes internal changes that actually increase its ability to resist further deformation and wear." Alright, reduced ductility and increased wear resistance usually go hand in hand. The patent application can be found here "Ductile intermetallic compounds for dental applications":http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/search-adv.htm&r=1&p=1&f=G&l=50&d=ptxt&S1=waterstrat-richard-m.INZZ.&OS=in/waterstrat-richard-m&RS=IN/waterstrat-richard-m Claim #1 of the patent aplication is "An alloy composition having a cubic CsCl or B2 type structure which can undergo stress-induced martensitic transformations at or near mouth or body temperature and consisting essentially of about 35 to about 60% by weight zirconium, about 1 to about 60% palladium, and about 1 to about 60% ruthenium." So far, so good, in steels the martensitic structure yields lower ductility and higher hardness and wear resistance. No surprises so far. But then the description of the invention in the application says "This invention relates to alloy compounds which undergo stress-induced martensitic transformations at or near mouth or body temperature. A martensitic transformation occurs in these alloys when they transform under stress from a cubic CsCl or B2 type structure, which is stable at elevated temperatures, to a CrB type structure that is stable at a lower temperature. This type of transformation increases the ductility of these alloys...Methods of enhancing the ductility of high strength steels and other alloys, through a combination of elements enabling the formation of stress-induced martensitic structures appear in the prior art." This throws me. I only know enough about the heat treatment of steels to be dangerous, but I've NEVER heard of martensite causing GREATER ductility than one would get from the ferritic or austenitic phases of the same alloy. And even if there was one, it certainly wouldn't be more difficult to machine in the more ductile phase. It seems to me that there's something fishy here. I'm hesitant to give this credence merely because it got a patent, I've seen patents given on descriptions that involve violations of the laws of fluid dyanmics.
  2. chilehed

    Cryogenics

    It's occasionally used in the heat treatment of steels to ensure that the microstucture completely undergoes the martensitic transformation. They used it on big battleship guns to maximize durability. There are a number of places that will treat small arms, but it won't do a thing to improve the accuracy of your rifle (which is what they claim). You can make really good ice cream using liquid nitrogen.
  3. In my first algebra class the instructor showed a proof that 1=2 and challenged us to find the flaw. The smart kid took finally figured out that it involved dividing by zero. log 1 = 0
  4. chilehed

    Muffler design

    reng, The fabrication is the easy part, it's the design issues that'll trip you up. Remember that the exhaust is just a part of a total system, and when you change it you affect the intake side as well. So tuning the system is important, it's really easy to end up with resonant interference between the ntake and exhaust sides and a loss of total airflow. Depending on how the fuel system is designed you can run lean at some engine speeds and rich at others, not the hot ticket for performance or durability. Other things being equal, for a given power output there's a minimum size for the muffler chambers in order to acheive a desired amount of noise reduction, so if you want to reduce the size of the mufflers you'll end up sacrificing either noise or power. The stock mufflers look kind'a big, so my guess is that if you use a single unit and squeeze it under the seat it'll take a bit of finesse to avoid losing power. At the very least, remember that when you bolt in the new system you'll have to look very carefully at your fuel and spark calibration to make sure how much you need to change them. It would really stink to end up with a melted piston because you ended up lean and oversparked. Also, don't forget the heat shielding.
  5. chilehed

    Muffler design

    reng, I know a little bit about exhaust systems. You're proposing a very ambitious project. If you want to learn stuff, knock yourself out. If you want a system that performs better than stock, it'd probably be better to buy aftermarket.
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