Walter Woods

Joseph N. Kotanchik

Robert A. Weinberger

Aluminum alloy sheet-metal specimens were supported in a fixture by rollers, offset grooved plates, opposite grooved plates. flat brass plates or flat wooden plates. It was found that measured values of compressive yield stress and modulus of elasticity obtained with roller supports were independent of supporting force applied to specimen, provided that sufficient minimum force is used to overcome initial deviations from flatness. Satisfactory stress-strain curves were obtained with all types of support, when supporting force is about 45 lb.

Investigation of Methods of Supporting Single-thickness Specimens in a Fixture for Determination of Compressive Stress-strain Curves

George J. Heimerl

Results of presented of tests to determine the effect of brake forming in various tempers on the strength of Alclade 75S-T aluminum-alloy sheet in the direction parallel to the brake. The tensile and compressive strengths of Alclad 75S-T sheet, formed in the O and W tempers, were either increased or little affected as compared with those of similarly treated unformed material. When Alclad 75S-T sheet "as received" was formed, however, the tensile yield stress was reduced about 7 percent for the with-grain direction and 1 percent for the cross-grain direction, whereas the tensile ultimate and compressive yield strength stresses were increased somewhat. The elongation was always slightly reduced as a result of forming.

Walter Woods

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