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National Advisory Committee for Aeronautics, Technical Notes - Stress and Elongation Graphs for Aluminum Alloy 75S-T6 Sheet

Results of tests on duplicate longitudinal and transverse specimens
of alumimm—alloy 758—936 sheets with nominal thicknesses of 0.032, 0.061;,
and 0.125 inch are presented in the following form:

Tensile and compressive stress—strain graphs and stress-deviation
graphs to a strain of about 1 percent

Graphs of tangent modulus against stress, in compression
Auxiliary graphs for estimating plastic buckling stress
Stress—strain graphs for tensile specimens tested to failure

Graphs of local elongation and of elongation against gage length
for tensile specimens tested to fracture

The stress—strain, stress—deviation, tangent—modulus, and auxiliary
graphs are plotted on a dimensionless basis to make them applicable to
material with yield strengths which differ from those of the test
specimens.

The present report is the fifth of a series presenting data on
high—strength aluminLun—ajlo3r sheet (references 1 to 1L) . The data are
presented in tables and graphs. Graphs of reduced modulus against
stress in compression for a rectangular section have been omitted in
this‘report since the tangent modulus is now considered best for use in
determining the buckling strength of members in the inelastic range
(reference 5) . In their place auxiliary curves for estimating plastic
buckling stress based upon the values of tangent modulus are given. An
example illustrating the use of these curves was given in reference 6.
The graphs are presented in dimensionless form to make them applicable
to sheets of these materials with yield strengths which differ from
those of the test specimens. All data are given for duplicate specimens.

The report gives the results of tests on aluminum—alloy 75S—T6
sheet, in thicknesses of 0.032, 0.061;, and 0.125 inch, obtained from
the Aluminum Company of America.

The author expresses his appreciation to Mr. P. L. Peach and
Mrs. P. V. Jacobs who assisted in the testing and in the preparation
of the graphs. ’

This investigation, conducted at the National Bureau of Standards,
was sponsored by and conducted with the financial assistance of the
National Advisory Committee for Aeronautics.