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  1. namelessudhay

    Palgmer - Miner equation derivation

    @rb1957 - The purpose is a bit longer and complex to explain in the post here. Long story short - I used a more derived method to find the damage in a shaft. When my colleague used the ISO standard referred Palgmer-Miner's method he found a different damage value. I wanted to know where exactly...
  2. namelessudhay

    Palgmer - Miner equation derivation

    @rb1957 - Thanks for the links. Info. in aerospaceengineering page was interesting. My objective is to know how the equation "Teq^p*sum(ni) = sum(Ti^p*ni) … " is derived.
  3. namelessudhay

    Palgmer - Miner equation derivation

    Hi Ted, Thanks for giving the information. The piece that I miss in the reference is: "The equivalent stress range concept in Eq. 8.4 is easily derived assuming a constant S–N slope and D = 1" I am curious to see this part.
  4. namelessudhay

    Palgmer - Miner equation derivation

    Hi Hytools... You are right, I should have named it "equation to find slope of a line" And does sum of n*T^p give the area under the curve? (I am bad at maths... May be this answer will turn to be important)
  5. namelessudhay

    Palgmer - Miner equation derivation

    Dear all, I am really sorry for not responding to your replies. Unfortunately, I didn't receive any email notifications and hence I assumed nobody replied to my question. @Chicopee - This equation is applicable to any component that undergoes a fatigue load cycle a single gear, a shaft or a...
  6. namelessudhay

    Palgmer - Miner equation derivation

    Palgmer-Miner equation is used in ISO standard ISO 6336-6. I want to understand how it is derived. It helps to consolidate damage caused by multiple torque, cycle bins. A bin means a torque applied for a given number of cycle. As an outcome of the equation, a single equivalent torque that...
  7. namelessudhay

    Dual mass flywheel clutch - How does it make a difference?

    Thank you very much, Brian. I understand if there was no secondary mass, the dampening of spring would not be efficient at high slip condition of the clutch.
  8. namelessudhay

    Dual mass flywheel clutch - How does it make a difference?

    I was going through these two documents: https://www.schaeffler.com/remoteme...effler_2/symposia_1/downloads_11/4_DMFW_1.pdf http://www.partinfo.co.uk/docs/140 My primary interest was to understand why and how Dual Mass Flywheel (DMF) is superior over the conventional Single Mass Flywheel...
  9. namelessudhay

    Is EN353 cold forgeable as much as SCM420

    Hi, We are doing a gear box for a two wheeler (for the first time). Most of our benchmarks are of Suzuki and Honda bikes. All their gears are made of SCM420. Surprising part is these gear teeth are formed by cold forging. No machining at all! Now, I was comparing the chemical composition of...
  10. namelessudhay

    Stronger alternative for 20MnCr5 is EN353

    Thanks, Ed. //You left out that they similar Cr content// True I should have listed down the similarities as well. //When you carburize the 353 you are forming a high C alloy steel, very strong, tough, and deep hardening.// Isn't it the same when I gas carburize 20MnCr5 as well? I just make a...
  11. namelessudhay

    Stronger alternative for 20MnCr5 is EN353

    Hi, I am facing a gear root bending failure in one of our commercial application transmissions. Due to practical reasons, changing any dimension is impossible. The gear is made of 20MnCr5, gas carburized. Couple of seniors are suggesting to go with EN353 instead. Two reasons: 1. EN353 is...
  12. namelessudhay

    How to measure gear start of tip relief diameter?

    Hi, Can we measure the start of tip relief diameter of a gear involute profile? My gear suppliers say the machines can not measure exact tip relief diameter. They have got a Tokyo technical instruments make gear machining machine and a Wenzel gear tester machine. How true it is? What is the...
  13. namelessudhay

    Protuberance in gears - Why doesn't shaving operation finish?

    Thank you both of you. I understand the reason now.
  14. namelessudhay

    Hybrid design enabled Vs disabled - With geometric set ON in both the conditions

    Thanks, Jackk. Just out of curiosity, why does catia have such two options, when there is no functional difference?
  15. namelessudhay

    Protuberance in gears - Why doesn't shaving operation finish?

    Just because shaving doesn't finish the root of a gear, a protuberance is given during hobbing. This, most of the time, leads to an undercut. To avoid this, can shaving operation clear root of the gear as well? Thus, I can avoid protuberance. Another question - Can grinding clear root?
  16. namelessudhay

    Hybrid design enabled Vs disabled - With geometric set ON in both the conditions

    Thanks SuDhakaran and Tikito. But my question is little more specific. What I observe is that there is no difference between hybrid and non hybrid, if the geometric set is turned on. Can you clarify pl.?
  17. namelessudhay

    Hybrid design enabled Vs disabled - With geometric set ON in both the conditions

    Hi, In Catia V5 R20, I get options to enable or disable hybrid design. With that I also have a choice to create a geometric set or not. My question now is this: What difference does it make between Hybrid design enabled and disabled but keeping geometric set on in both the conditions? I read...
  18. namelessudhay

    How are notch or stress concentration factors in FEA of shaft strength considered?

    Hi. Thanks for your answers. I am more interested in knowing how FEA finds out the high stress in that area than the best method to model it. Pl. help. Thanks.
  19. namelessudhay

    How are notch or stress concentration factors in FEA of shaft strength considered?

    Hi, I want to understand how stress concentration factor or notch factor is considered in FEA method. Lets assume a case of stepped shaft which has got the left end of the shaft fixed with rigid wall and the other end being pulled by an axial load.(pic. attached) In the case of conventional...
  20. namelessudhay

    Helical gear tooth thickness using DOP?

    Hi, Is it possible to accurately measure the tooth thickness of a helical gear (even or odd no. of teeth) using two pins instead of balls? Thanks.

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