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  • Users: daparojo
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  1. daparojo

    Electroless Nickel Plating

    I have an application that will be submerged in seawater and is made of EN24 T. Originally the part was not plated and during surface, it fell foul to corrosion, but worked. We have made a new component (the material has had to stay the same), and have decided to have it Electroless Nickel...
  2. daparojo

    Saltwater Corrosion

    Dear All, I am looking at a project in where we will be using EN24 T (BS970 817M40) material in a seawater environment, and where it will be artic conditions. The material will be tested in accordance with the temperatures i.e -10 degrees c. With that in mind, to protect this material against...
  3. daparojo

    Surface Pressure

    I am wondering if you could help. I have a component (Female Cover) that has a parallel OD and a Taper Bore. The Taper Bore inner surface is subject to a constant pressure due to a component (Rod) that slides inside the bore, with a corresponding male taper (similar to a morse taper). The whole...
  4. daparojo

    Question On Slip/Bolting Joint

    Just a quick question, and grateful for any guidance. I have an simple application that has 3 Bolts all have the same diameter, d, and has a slight clearance with the hole, D. They are responsible for clamping 2 plates together, or it could be 3 dependent on design. They are tensioned, and a...
  5. daparojo

    Rotational Application - Bolting

    I have an application that has 12 bolt in a rotational flange that has speeds up to 3000 rpm. As the nuts are external, and have a relative weight to them, I have calculated the total bending stress in one bolt as around 500 N/mm2 - this is subject to a centrifugal force if the nuts move due to...
  6. daparojo

    Bolt Query

    Please could you review, and see if I am going along the correct lines. I have a plate of 15 Bolts, and is subjected to Forces in the Fx, Fz and Fy plane. The forces can only act in one direction at anyone time. See attached diagram. The undercut of the bolt (smallest area is 57mm)i.e. area,a...
  7. daparojo

    Thread Engagement

    I have a problem and need some guidance. I have a bolt that is stretched hydraulically to 1700 kn. It's an M76x6 thread. I have always used 0.8 d to calculate the engagement on the nut/bolt. Nut width = 0.8 x 76 = 60.80 = 61mm Material Yield 680 N/mm2 Material US 850 N/mmm I ran this through a...
  8. daparojo

    Bolt Extension

    Firstly, it's a long time since I have calculated this, so I need a little refreshing. I have a bolt M48 that is in a coupling hole 65 dia. Bolt is xxx mm long. It is tensioned hydraulically at one end, nut tightened and then pressure released. The bolt has stretch xxx mm The load is xxx kN Am...
  9. daparojo

    Bolt Extension

    Just a quick cry for help. I have a bolt that is subject to a load hydraulically, so in that I know precisely what the loading is on the bolt. Once stretched, the nuts are locked and the pressure released. Obviously, the bolt has extended slightly to retain the load. I need to double check the...

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