DYNAMIC TESTS OF STRUCTURAL ALUMINUM ALLOYS.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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A series of dynamic tests was conducted on three grades of structural aluminum alloys a 6061-T6, b 6063-T5, and c 5456-H321. The effects of strain rate on the mechanical properties of these materials were obtained. In the elastic range of the material tested, the strain rate ranged from a static value of 0.000022 in.in.sec to a maximum value of 2.5 in.in.sec. The mechanical properties of the alloys showed a variety of changes when subjected to high strain rates. The 6061-T6 aluminum increased 5 and 10.6 over the static value for yield stress and tensile strength, respectively, at the maximum test rates. The 6063-T5 aluminum shoed no change in yield stress and a 5.8 increase in tensile strength at the maximum test rate. The 5456-H321 aluminum was obtained in plate form, and specimens were prepared with their longitudinal axes both parallel and perpendicular to the direction of rolling. The yield stress for specimens prepared parallel to the direction of rolling decreased 3.6, and the yield stress for specimens prepared perpendicular to the direction of rolling increased 2.5 at the maximum test rate. The direction of rolling did not affect the tensile strength behavior under rapid testing since both groups of 5456-H321 alloy exhibited an average reduction of 5.7 in tensile strength at the maximum test rate. None of the changes in mechanical properties are believed to be of sufficient magnitude to be of concern in design. Author
- Metallurgy and Metallography