Stress concentration factors have been determined for large hole to small hole diameter ratios (D/d) of 10 to 50 for two holes in an infinitely wide tension-loaded panel. Finite element analysis was used to model the system of two holes in a plate that approximates the infinitely wide and tall case. Both the D/d ratio and edge to edge hole spacing were examined for hole placement along an axis perpendicular to the direction of the tension field. It was found for large D/d ratios that the stress concentration factor was only dependent on the distance between the hole edges divided by the large hole diameter. For the configurations analyzed, the stress concentration factors varied from approximately 3 to 11.

1.
Peterson, R. E., 1953, Stress Concentration Design Factors, John Wiley and Sons, Inc., New York, NY.
2.
Savin, G. N., 1961, Stress Concentration Around Holes, Pergamon Press, New York, NY, pp. 134–139.
3.
Timoshenko, S., and Goodier, J. N., 1951, Theory of Elasticity, McGraw-Hill, New York, NY, pp. 55–81.
4.
Topping, A. D., 1947, “Stresses in a Plate Having a Relatively Small Circular Hole and Loaded Parallel to the Axis of the Hole Under Various Conditions of Constraint,” Ph.D. thesis, University of MO—Rolla, Rolla, MO.
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