Effect of stress concentration on the mechanical properties of the 1201T1 aluminum alloy at low temperatures

Peculiarities of neck formation under low-temperature discontinuous yield of metals. Part 2. Plane strain

“…In [5], relatively large β values (60-65°) had been obtained for specimens of 1201T1 aluminum alloy at 173-293 K.…”

“…However, such a large value of this ratio is practically unachievable as it corresponds to a strain of over 300% [2], which is greatly in excess of the plasticity resource of materials. It may be assumed that for some structural alloys, the appearance of necks at abnormally large angles (up to β =°90 ) results from different state of material, which corresponds to another plasticity condition, viz Tresca-Saint Venant condition [5]. But for materials for cryogenic purposes, in particular for a number of aluminum and titanium alloys, as well as austenitic steels, it has been found that the shape of yield and fracture limit curves (and hence Mises and Coulomb conditions) does not change on cooling specimens to cryogenic temperatures [7,8].…”