STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
(OP)
Fellow Stress Engineers:
Do any of you know of a reference to a stress concentration factor in-way-of a chamfer over a small proportion of the circumference of a circular aperture; see attached view.
Thanks in anticipation.
StressMan
Do any of you know of a reference to a stress concentration factor in-way-of a chamfer over a small proportion of the circumference of a circular aperture; see attached view.
Thanks in anticipation.
StressMan





RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
another day in paradise, or is paradise one day closer ?
RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
- If you do not have the loads or cyclic loading - than this is a good time to get acquainted with the OEM.
- For an added margin of safety - the blended location will have to be NDT crack checked; roto-peened & corrosion-resistance treated.
* Wing plank damage around cut-outs is regarded as significant damage - regardless how small the defect.
RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
is a 3rd edition that I don't have since being retired for quite some time.
R. Roark's "Formulas for Stress and Strain" has some tables for concentration factors... not very complete.
G-pa Dave
RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
The blend is at a systems penetration in a wing rib. To design, fatigue life is very high. Treating the blend as a chamfer around the entire circumference and calculating an effective plain hole diameter leads to a stress increase at the attachment holes - no problem. I am left however, with what to do at the blend. edmeister's reply indicates that it is not trivial.
StressMan
RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
Considering the following case: 1) A hole in a plate 2) A notch at the edge of the hole
Stress concentration for each calculated separately.
1) Hole - Kt of 3
2) Notch - Kt of 2
Stress concentration superposition (assuming the notch is located at peak kt location of the hole - normal to loading direction)
Total kt = Hole kt x notch kt = 3 x 2 = 6 (Stress raises too much!)
For this case, chamfer can be assumed as notch, since chamfer is extended to the most of the thickness.
RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
You might get somewhere if you consider the problem similar to a hole with a bump, and assume the Kt increases by the same ratio ... Kt = Kt_cut-out*Kt_circle_with_bump/Kt_circle
another day in paradise, or is paradise one day closer ?
RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
http://espace.library.uq.edu.au/view/UQ:131820/A1....
Regards
RE: STRESS CONCENTRATION FACTOR, SHORT CHAMFER IN EDGE OF CIRCULAR APERTURE
Regards,
StressMan