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  1. sullivnc

    Bending Moment

    Glass99, thank you, this is the type of informstion I've been after. Just got home for the weekend, but I'll start with this on Monday!
  2. sullivnc

    Bending Moment

    To show you the intelligence level of these mechanics, they are starting at the bottom of the pattern, and then just going around, rather than going across the pattern and tightening in increments like we told them to. The reasons the glass is cracking are obvious: a bending stress due to the...
  3. sullivnc

    Bending Moment

    Again, this is not our problem. Air Force mechanics, while installing our device on their planes, over-torqued screws past our given specifications and sheared the heads off the screws. Instead of removing the protruding screw, they left it there and continued the installation. Thermal...
  4. sullivnc

    Bending Moment

    The problem has been fixed as far as their mechanics installing the assembly, but the Air Force still wants us to prove that that was the main culprit and not an inherent problem without design. We have proved it in practice, but they also want us to prove it theoretically. I'm looking for...
  5. sullivnc

    Bending Moment

    It's a landing light filter. We don't have to live with the raised fastener, our customer needs to hire competent mechanics who wouldn't just leave a screw protruding after they shear the head off. But regardless, we have to prove that that's a problem. It's Borofloat glass.
  6. sullivnc

    Bending Moment

    As I said, all the edges are not flat, there is a 1/16" protrusion at -22.5 degrees around the bolt petter pressing up on the bottom of the frame.
  7. sullivnc

    Bending Moment

    Think a circle with the bottom chopped off. 281 deg 18' 30" of the circle are still intact. The flat along the bottom is 5.04" long. The uniform thickness is 0.197".
  8. sullivnc

    Bending Moment

    There are 2 gaskets, one protecting every surface of the glass the contacts the frame, and a flat gasket between the frame and surface. There is a thermal element as well, which I know I need to work out, but modeling the physical stress is what's throwing me right now.
  9. sullivnc

    Bending Moment

    Hi everyone, Wasn't really sure where to post this. I have a problem I'm having trouble wrapping my head around. I have a piece of glass that is clamped around the entire outer edge. The frame is then secured down to a surface. The glass is circular with a flat (OD of 7.95", 281 deg 18'30"...
  10. sullivnc

    Heat Sink Question

    The openings are at the top & bottom, and no, I have a thermistor in place to tell me when the heat sink has reached the proper temperature.
  11. sullivnc

    Heat Sink Question

    Thanks for the questions. It is a flexible heater strip, attached to the outer diameter with epoxy. The strip is insulated on its non-contact side, with about .125" of Fiberfrax insulation. The heat sink has an OD of 2.75" and an ID of 50 mm (1.9685"). The OD of the heat sink is covered by...
  12. sullivnc

    Heat Sink Question

    It's been a few years since I took thermo and heat transfer, need some help with a question: I am using a 29 J/s heater strip to heat a heat sink (181.4 g of aluminum) to 60 degrees C at room temperature. I am wondering how to tell if this heater strip has enough power to overcome the effects...

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