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Recent content by EasyAim

  1. EasyAim

    Bending Moment Induced by Shims

    This is a rather embarrassing riddle for me since I've been in the aerospace industry for 20 yrs now: We have a skin 0.130 thick that has a dent at the edge. The dent is 0.040 out of plane over about 5.0 inches wide. Residual stresses are about 15 KSI. We are not going to reverse bend it...
  2. EasyAim

    Dents

    There is an excellent paper by Frank Simmons, Jose Veciana, and John Wallace titled "Effects of Dent Removal on the Design Properties of Fuselage Skin Material", 2000-APRIL, AIAA paper 2000-1467. SUMMARY: Material: 2024-T3 clad aluminum Skin gage: 0.040, 0.050, 0.063 Dent depth: 0.025 to...
  3. EasyAim

    Good web site for engineering papers?

    Good job, 'Rikman'. This was a neat website. You're right - it did not have exactly what I'm looking for but it has other great references.
  4. EasyAim

    Good web site for engineering papers?

    I'm performing a study of the best method of modeling interference/clearance fit fasteners using pro/MECHANICA. It is possible to model fasteners in a hole using gap elements, spring elements, constraints, etc.... and all of the results look good but the stress distribution is slightly...
  5. EasyAim

    Max Interference for Press-Fit Bushing

    Thanks Phil, this helps.
  6. EasyAim

    getting out of this job

    If your primary concern is to get out of manufacturing, I would strongly urge you to move laterally in your company to something related, such as joining the structures or design group. You won't lose any pay or seniority, your knowledge in manufacturing would be a great asset and you'll...
  7. EasyAim

    Dents

    Assuming we are talking solely about metallic structures: Rarely are dents are concern. The first thing I ask is "is it a thru dent?" (i.e. is a bulge visible on the opposite side of the part?). If so you may have some buckling/stability issues. Another serious concern is if...
  8. EasyAim

    Maximum interference fit

    Is there a good rule of thumb regarding the maximum allowable interference to press-fit a bearing? We are designing a lug assembly that involves an MS14103 self-lubricated spherical bearing press-fit into 7050 aluminum plate material. I realize that interference could be so tight that it...
  9. EasyAim

    Max Interference for Press-Fit Bushing

    What is the detrimental effect of increasing the interference between a metallic part's hole and a steel press fit bushing? For argument sake let's say this is a cheap, small lug and that it is fracture critical. If the part doesn't break nor deform significantly upon the bushing...
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