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Pull Testing of Riveted Wedge Trailing Edge Joints

HFS

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I'm the guy Dan referred to a while back about pull testing of these joints. Disclaimer - My testing machine is "Oakie" at best & not even on the low end of the scale at worst. But it does give some relative indication of overlap shear joint strength - but only at (or near) ultimate loads. So it isn't effective as an indicator of the actual performance when the relative displacement of the coupon "faces" involved have "failed" per Mil Spec MIL HDBK 5F Volume 2 - Rivets. More particularly, joint failure is defined as transverse movement of the contact faces of less than or equal to .04d. In this case, with a -3 rivet (d = .09375), that value becomes ~ .004" (the thickness of a human hair).

The attached files give the results for several different types of joint assembly that are currently in use, for your review.

Over the years (from the late 1980's) I have been performing similar joint tests for my own edification, and so am fairly confident of the results.

HFS
 

Attachments

  • Report on TE Riveted Joint Strength - 1.jpg
    Report on TE Riveted Joint Strength - 1.jpg
    1.7 MB · Views: 66
  • Report on TE Riveted Joint Strength - 2 .jpg
    Report on TE Riveted Joint Strength - 2 .jpg
    1.7 MB · Views: 65
  • Trailing Edge Coupon Rivet Joints.jpg
    Trailing Edge Coupon Rivet Joints.jpg
    1.4 MB · Views: 60
  • Pull Testing Machine (1).jpg
    Pull Testing Machine (1).jpg
    1.5 MB · Views: 55
  • Pull Testing Coupons - Partial.jpg
    Pull Testing Coupons - Partial.jpg
    2 MB · Views: 69
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