The uniaxial and the biaxial tensile test of A1050-O sheet metal were done using the simple biaxial - tensile- testing apparatus which operates independent lathe chuck. Stress-Strain curve is obtained as good as the conventional uniaxial tensile testing machine. On the other hand, about biaxial test, it became clear that the shape of a specimen needs to be improved. However, arbitrary stress courses were made to act on a specimen, and it became possible to measure the plastic deformation characteristic with high precision.
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