Effects of size and shape of specimens on the tensile properties of sheet metals of aluminum alloy

Abstract

These investingations were undertaken concerning the effects of the ratio of width/thickness in reduced section of sheet-metal tension specimens on the tensile properties of aluminum alloy designated as 5052-0. The dimensions of the specimens for these tests were determined as follows. The width of grip sections was 1.41.5 times and the radius of fillets was 1.01.2 times as large as the width of reduced section.The principal results obtained were as follows.1) The size and shape of the test specimens used had little effects on the proof stress observed.2) The tensile strength was very slightly increased with the increase in the ratio of width thickness. However, the effect was so little that the strength would substantially be unchanged independent of the size and shape of the specimens used.3) The curve representing the relation between δ and L0/√S0 (in which δ: elongation percentage, L0: gauge length, and S0 : cross-sectional area of specimens) was very likely to be horizontal for the values of L0/√S0≥10, and the values of δ for L0/√S0≥10 were almost indifferent to the size and shape of the specimens used.Accordingly, the gauge length of the sheet-metal tensicn specimens would preferable be determined in the range of L0/√S0≥10.4) The type of fracture was changed at about width/thickness =6. The shearing of fracture appeared in the direction of plate thickness, when the ratio was less than 6, and in the direction of plate width when the ratio was more than 6.