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  1. FennLane

    End of Life - Fatigue

    I don't agree that the clock can be reset of defects are below a specified length. This assumes that you have studied the defect tolerance of the structure and understand the fatigue crack propagation. There is some confusion in the original post an that is whether or not the crane has been...
  2. FennLane

    Steel Bar (Rebar) Quality Problem

    What kind of Rebar as this may have a bearing on the problems you are having. Where do you buy our raw material and have you checked the stock you are using prior to rolling?
  3. FennLane

    Formulas for Tensile and Yield strength

    This all sounds a little strange and I have never heard anything like this in more than 40 years working as a Metallurgist 30 of which were spent making testing machines. Strain and elongation are essentially dimensionless so what do you mean by 'validate them'? Sounds like a Bulgarian...
  4. FennLane

    Flow rate of lubrication system for gears

    The real issue with a splash lubricated gearbox will be the duration it has to run for and the power losses due to the mesh and windage. Yu need to think that the gears not only need lubrication but also cooling as will the bearings. I would try to budget for a minimum of 1% of the transmitted...
  5. FennLane

    Superchilling/cooling castings and metals

    There is a HUGE amount of really spectacular BS available on the subject of Deep Cryogenic Treatment (DCT) of metals. Clearly there are some applications where there are explicable and significant benefits to be obtained by using DCT but unhappily the industry seems to be populated by a large...
  6. FennLane

    relation between strength and hardness of material

    In traditional metallurgy 'strength' is normally considered to mean tensile strength and hardness to be a measure of resistance to indentation and it is clear that in the vast majority of circumstances there is a valid correlation between these two values. 'Impact Strength' is also a common...
  7. FennLane

    Cold work dislocation (interactions)

    Once Again - Dieter Mechanical Metallurgy. Give good explanations of Frank Read Sources, Jogs, Climb, etc, etc. To look at it more simply annealed steel would have around 10^8 dislocation lines per cm^2 of surface and a fully cold worked steel can have as many as 10^28 lines per cm^2. (This...

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