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  1. SJLeemans

    Fully Threaded Stud

    I'm glad I could help. As far as going with a deeper hole - although there is a point of no return, it never hurts to go deeper when your parent material is softer than your stud. There are many ways that the preload can relax. Don't be afraid torque them past the "minimum" preload...
  2. SJLeemans

    Fully Threaded Stud

    I'm having trouble seeing why you need the jamb nut at all. If it is to preload the stud in the box, you can do the same thing with the nuts that you are using to attach the box to the mounting plate. Perhaps I'm just not understanding the set up; but.... I see no reason why you can't just...
  3. SJLeemans

    Rule of Thumb - Numbr of Thds 2B Full Strength

    I've always heard it was 1.5 * the Maj Dia of the screw for a blind hole; and a minimum of three threads showing for a thru hole. Of course, this all depends upon materials, etc. If you want more than a rule of thumb, then there is a useful formula, which basically balances the shear and...
  4. SJLeemans

    Engineering constant transformation

    Unless you have a 3D laminate, ie fibers oriented out of the lamina plane, the Z-dir properties (thu the thickness) do not change with an XY (in plane) rotation corresponding to the orientation of the layer. The Z direction properties are typically taken to be the same as the transverse...
  5. SJLeemans

    how to find the weight of a body while deigning in algor

    I have an older version of Algor, but there is a weight and CG calculator in the TOOLS pull down menu that I use. Your best bet is just to call ALGOR and ask them how to do it for the version of the program you are using. 1.800.48ALGOR (1.800.482.5467) You can also most likely get the info by...
  6. SJLeemans

    Looking for torques values for steel into fiberglaass

    Stubby - what is the application - ie what is the physical envelope of the fiberglass? What is the fiberglass structure? I'd be happy to help if I knew more....
  7. SJLeemans

    axisymmetric filament wound shell

    You should be able to get this information from the NASTRAN manual. Each element has a description with all of the theory and technical parameters. If you can't find it, call MSC tech support - they will gladly assist you. They are good people. Typically, you specify the properties of a...
  8. SJLeemans

    strong, flexible material?

    If you are looking for high elongation at failure - you should look at fibers used in ballistics applications. The name of the game there IS high elongation and energy dissipation. Carbon and glass are too brittle to work as a continuous pultruded product. You might get there with some kind...
  9. SJLeemans

    orthotropic material properties

    If I understand the question right, I think this response will help: Typically, the material properties (for a single composite layer or lamina) are taken to be the same in both the Y and Z (transverse) directions, since they are both resin dominated properties. While the fiber does have a set...
  10. SJLeemans

    Help Me to Identify a Composite

    Obviously, strength to weight is the critical factor here. I have a feeling, however, that cost is also going to be an issue. How much are you willing to pay for this ramp? What kind of volumes are you talking about? Your best bet is to call a composites company and have them do the...
  11. SJLeemans

    measuring stress in a gear

    Here is a company worth looking at for a possible solution for your analysis: www.stressphotonics.com They supply and support thermoelastic and photoelastic equipment and analyses
  12. SJLeemans

    measuring stress in a gear

    Photoelasticity came to mind for me, as well; however, you need to have access to the right material, equipment and expertrise. There are still a few experts out there, if you can find one. Try a good engineering university. You should also be able to find a few labs that can do the work for...

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