Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. jmblur

    Helicoil into Quartz?

    Might it not be easier to simply epoxy or otherwise bond a metal shaft in place in a blind hole in the quartz "base", with a through hole in the 2nd piece of quartz, use that as your stud? You could then use a nut, circlip, or any other type of connector you wish. you still need to deal with...
  2. jmblur

    Test Lab for modal analysis?

    thanks for the link, definitely a great site for what I'm looking for.
  3. jmblur

    Test Lab for modal analysis?

    Looking to do modal analysis on a hand-held structure in an effort to reduce uncomfortable vibration for the user - think baseball bat and the stinging sensation when mishit. Ideally, we'd be able to quantify the amount of damping (and therefore "sting reduction" for the marketing folks) from...
  4. jmblur

    Book recommendation? Impact dynamics

    Should mention - I'm not dealing with extremely high velocity ballistics or anything - I'm dealing with lower velocity impacts that, while slower, are certainly past the quasi-static range. For example, baseball/bat impact, a hockey slapshot, a golf drive, a helmet-to-helmet football impact...
  5. jmblur

    Book recommendation? Impact dynamics

    Looking for a good textbook on impact mechanics - ideally covering both ductile and brittle metals as well as polymer impact failure theories. Bonus points if it covers a bit of impact failure with composite materials (carbon composite, fiberglass, etc.) as well! Anybody have any good...
  6. jmblur

    Remove small gaps/defects that are hard to find

    Mates are used to define how an assembly is constructed. So, if you have two faces you want to be in contact, you use the mates tool in assembly to define them as coincident. If you're doing it on a single part, mates do not apply, and you probably have a geometry error somewhere. Did you...
  7. jmblur

    Metal Tube Radial Dent/Crush equation?

    Good guess Bribyk, that's the one. Four point doesn't really make sense for the types of loading we see where bending or breakage-through-bending occurs - generally it's either a point load or a non-uniform distributed load (human body contact), either while cantilevered or when supported...
  8. jmblur

    Metal Tube Radial Dent/Crush equation?

    One more thing I forgot to mention - We also do 4 point bend tests on these shafts for ultimate strength (why 4 and not 3 you'd have to ask the last engineer, but for sake of continuity I use the same test). Generally these deform ~2.5 inches before failure, where they generally collapse and...
  9. jmblur

    Metal Tube Radial Dent/Crush equation?

    Rate is approximately 10m/s, although there's quite a bit of variation. I haven't yet done a thorough study of the loads and speeds behind the denting phenomenon (been too busy getting next year's product out, once I get some breathing room it's going to the top of the list). The angles and...
  10. jmblur

    Metal Tube Radial Dent/Crush equation?

    Thanks MSU, I realize it gets real complex real fast, was hoping there was a kind of simplified "higher this = better impact resistance" type equation, even if it was just comparative for one type of impact with one profile and one impactor - obviously it wont' be perfect, but it will at least...
  11. jmblur

    Metal Tube Radial Dent/Crush equation?

    In addition, if you could point me to any books that might have this kind of information covered well, it would be most helpful! to clarify the above (been talking too much to marketing lately...), I'm looking for an equation to approximate the local plastic deformation due to high strain rate...
  12. jmblur

    Tube dynamic dent/crush equation?

    In addition - does anyone have any good books to recommend for this type of info, especially given various cross sections and strain rates? Cheers!
  13. jmblur

    Tube dynamic dent/crush equation?

    I'm working with structural metal tubing (of an elongated octagonal cross section (height is about 17% taller than width) that's subject to high enough radial impacts (generally with another tube of similar size and strength) to cause both denting (generally on the edges), usually only small...
  14. jmblur

    Metal Tube Radial Dent/Crush equation?

    I'm working with structural metal tubing (of an elongated octagonal cross section (height is about 17% taller than width) that's subject to high enough radial impacts (generally with another tube of similar size and strength) to cause both denting (generally on the edges), usually only small...
  15. jmblur

    Computer suggestions for Simulation (Nonlinear)

    We're shuffling some older computers out, and since I'm first in the "power user" pecking order (being the only FEA user), IT has suggested that we pass my current computer to one of the other heavy solidworks users and get a new workstation for me. I'm not about to argue, even though my...

Part and Inventory Search

Back
Top