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Tests of 10'' 24S-T Aluminum Alloy Shear Panels with 1.5 Inch Holes

By Paul Kuhn and L; Ross Levin
SUMMARY

Tests were made of a number of 10-inch shear panels
of 24S-T aluminum alloy with ltfi—inch holes to determine
the stress concentration at static rupture and the de-
formation characteristics. The average factor of stress
concentration was found to be about 1.1; reinforcements
around the edges of the holes did not increase the ulti-
mate strengths. Permanent set began in specimens with—
out holes at nominal shear stresses of 10 to 12 kips per
square inch. In thin specimens with holes, permanent
set began at the buckling stress.

INTRODUCTION

In connectiOn with a previous investigation of the
strength of shear webs, some tests had been made of 24S-T
aluminum-allOy tension specimens 1 inch wide with afie-
inch holes (reference 1). These tests indicated a stress—
cOncentratiOn factor of about 1.08 for static rupture.
The question arcse as to whether this factor could be ap—
plied to somewhat larger holes, such as these used to
permit the passage of conduits. tubing, or controls
thrOugh a shear web, and as to how much the stress con-
centration could be reduced by reinforcing the edges of
the holes. The results of a series of tests undertaken
to answer these questions are presented herewith. In the

-course of the tests, information was also obtained on the

depth of the shear buckles both under lead and after re-
moval of load.
SYMBOLS
a side of shear frame, inches
d diameter of rivet hole, inches
D diameter of hole. inches
E Young's modulus of elasticity, kips per square inch
P ultimate load. kips
t sheet thickness. inches
0 normal stress. kips per square inch
OY-P. normal stress at yield point, kips per square inch
T nominal shear stress. kips per square inch
Tor critical shear stress. kips per square inch