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  1. RayJohnson2

    FEA - stresses in bolt. How to interprete?

    I am designing some components that are subject to forces and pressures. So I need to calculate and check if the strength of these components is okay to be safe. I am doing this by Finite Element Analysis (FEA) in Creo Parametric (Simulate module). Doing FEA is one thing. Interpreting the...
  2. RayJohnson2

    O-ring does not remain in its groove.

    Hi all, I have an annoying sealing problem. I have a test setup where a robot takes a series of plastic DUT's (Devices Under Test) one by one, and presses them against an air nozzle. The DUT's are then subjected to an air pressure and a temperature range. The seal between the DUT and the nozzle...
  3. RayJohnson2

    Please advice on this o-ring seal design

    Hi all, I am considering the following design to seal a chamber (holding compressed air of 70 bar (~1000 psi)) using an o-ring. I would like your advice on this. See the attached sketch. I have only sketched half the construction. It is pretty much symmetrical around the vertical axis, so...
  4. RayJohnson2

    AISI 9840 stainless?

    Hi all, Well, the title of this thread already says it. Is AISI 9840 stainless? Or can it rust in a 'normal' (but humid) atmosphere? Kind regards
  5. RayJohnson2

    Coil wire - maximum current?

    Hi all, I am designing an electromagnet, a coil, with roughly the following specifications: - diameter about 30 mm, length about 40 to 50 mm - maximum field strength: 50 mT (500 Gauss) - AC, 0 to 330 Hz - environment temperature: 150°C - core: mu-metal - winding: copper enamelled wire, diameter...
  6. RayJohnson2

    BeCu spring deformation

    Hi all, Could you help refresh my memory a bit? I am designing a 'contact needle' in beryllium copper (BeCu). The purpose of this needle is to make contact with the lead of an electronic semiconductor device (a 'chip') to do electric measurements on this chip. To make contact, the needle is...

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