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  1. user71

    Shaft Failure

    Hello, Anyone care to look at this failed shaft? - I'd like to know if it is fatigue or something else that might cause it to break like this? I'm a little baffled because I can't see any beach marks or similar looking breaks from any books I have. It is 1045 material 1" diamter. It's load...
  2. user71

    Fatigue Calculation - equivalent stress

    I need to estimate the mean life of a cross section that has a very significant stress concentration (approx 10X average stress) The loading in the section cycles from 25 to 100% and I expect it to fail around 100,000 cycles so infinite life does not apply. What is the correct approach to...
  3. user71

    Butt welded shaft fatigue strength

    How can the tensile fatigue limit be estimated in a 1.25 inch shaft that has been butt welded assuming it has been properly prepared and welded? I've looked in British Standard 7608 and a couple other machine design books and do not see any examples of that kind of connection in a shaft, only...
  4. user71

    Design of roller hub/shaft to improve fatigue life

    I need to design a hub/shaft on a roller that is subjected only to high bending stresses that can lead to fatigue failures of the shaft. Which design is best from a fatigue point of view? - machine a single piece hub and stub shaft with a large radius (actually a compound radius) in the...

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