ESDU 93030:2012

ESDU 93030 introduces a computer program, ESDUpac A9330, that
calculates the stress concentration factors from polynomial
equations that were fitted to a wide range of finite element
calculations and reproduce them within 2 per cent. For plain and
countersunk holes stresses due to remote tension and out-of-plane
bending are considered. In addition, for plain holes the effect of
pin loading is simulated by a cosine pressure distribution constant
through the plate thickness and unaffected by any distortion. For
countersunk holes, the ratio of shank length to plate thickness can
vary from 0 to 1 (pure conical hole to constant diameter hole) and
for both hole types the diameter-to-plate thickness can vary from
0.5 to 5. The program gives stress concentration values at 21
equally-spaced positions along the bore, and maximum and minimum
values with their exact locations. Graphs illustrate the effect of
varying the major parameters on the distribution of stress along
the bore. Comparison of the results with other available data is
made.